Faculty Profiles - TSUBOI Nobuyuki

Papers - TSUBOI Nobuyuki

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Investigation of liquid n-heptane/air spray detonation with an Eulerian-Eulerian model Reviewed International journal

Jourdaine N., Tsuboi N., Hayashi A.K.

Combustion and Flame 244 2022.10

Effects of a Recess on Coaxial Cryogenic Injections at Supercritical Pressure Reviewed International journal

Muto D., Terashima H., Araki T., Tsuboi N.

Journal of Propulsion and Power 38 ( 4 ) 581 - 591 2022.01

Difference between 2D and 3D NS calculations for RDE pressure gain Reviewed International journal

Hayashi A.K., Nihonmatsu R., Ito T., Tsuboi N., Ozawa K., Otsuka Y., Ishii K.

AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025 2025.01

Correction: [3D Numerical Simulation on Disk Type RDE used Hydrogen-Air Premixed Gas and Non-premixed Gas with Multi-Ports Injection] (American Institute of Aeronautics and Astronautics Inc, AIAA) Reviewed International journal

Ito T., Tsuboi N., Ozawa K., Hayashi A.K.

AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025 2025.01

3D Numerical Simulation on Disk Type RDE used Hydrogen-Air Premixed Gas and Non-premixed Gas with Multi-Ports Injection Reviewed International journal

Ito T., Tsuboi N., Ozawa K., Hayashi A.K.

AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025 2025.01

Two-dimensional detailed numerical simulation of ammonia/hydrogen/air detonation: hydrogen concentration effects and transverse detonation wave structure Reviewed International journal

Kohama S., Ito T., Tsuboi N., Ozawa K., Hayashi A.K.

Shock Waves 34 ( 2 ) 139 - 154 2024.04

Study of Nozzle Choking Effect on Pressure Gain of Disc Rotating Detonation Engine Reviewed International journal

Hayashi A.K., Otsuka Y., Ishii K., Ito T., Tsuboi N., Ozawa K.

AIAA SciTech Forum and Exposition, 2024 2024.01

Two-Dimensional Detailed Numerical Simulation on Ammonia/Hydrogen/Air Detonation : Hydrogen dilution effects and sub-transverse wave structure in transverse detonation Reviewed International journal

Shui Kohama, Nobuyuki Tsuboi, Kouhei Ozawa, Koichi A Hayashi

29th International Colloquium on the Dynamics of Explosions and Reactive Systems Papaer 176 2023.07

Analysis on Pressure Gain of Rotating Detonation Engine Reviewed International journal

A. K. Hayashi, Y. Otsuka, K. Ishii, K. Yoshidomi, T. Ito, N. Tsuboi, K. Ozawa

The 34th International Symposium on Shock Waves T04-0282 2023.07

Effects of Reynolds Number and Ramp Angle on Gortler Vortices over a Compression Ramp Reviewed International journal

Kalash Dixit, Ritu Raj Kumar, Nagabhushana Rao Vadlamani, Nobuyuki Tsuboi

The 34th International Symposium on Shock Waves T19-0135 2023.07

Numerical Simulation on DDT in Real and Large Scale Combustion Chamber Using a Combustion Velocity Model and Ignition Model with a Detailed Chemical Reaction System Reviewed

Ichiro Nakamori, Takayuki Tomizuka, Atsuo Takahashi, Fumitomo Onishi, Mikhail Kuznetsov, Takashi Kodama, Yoshikazu Tamauchi, Naoya Sato, A. Koichi Hayashi and Nobuyuki Tsuboi

29th International Colloquium on the Dynamics of Explosions and Reactive Systems Paper 127 2023.07

Detailed Numerical Simulation on Dimethyl Ether/Oxygen Premixture Detonation Using Reduced Chemical Reaction Model -Disturbance of Cellular Structure- Reviewed International journal

Kubota Daiki, Tsuboi Nobuyuki, Ozawa Kohei, Hahashi A. Koichi

29th International Colloquium on the Dynamics of Explosions and Reactive Systems Paper 193 2023.07

Operation characteristics of a disk-type rotating detonation engine Reviewed International journal

Ishii K., Ohno K., Kawana H., Kawasaki K., Hayashi A.K., Tsuboi N.

Shock Waves 33 ( 3 ) 267 - 274 2023.04

Influence of tube cross-section geometry on high-pressure hydrogen-flow-induced self-ignition Reviewed International journal

Asahara M., Yokoyama A., Tsuboi N., Hayashi A.K.

International Journal of Hydrogen Energy 48 ( 21 ) 7909 - 7926 2023.03

Numerical Study of Cryogenic Hydrogen Jet in Crossflow under Supercritical Pressure: Comparison of Tandem and Twin Jets Reviewed International journal

NAKATSUKASA Tomohito, AMANO Taishi, ARAKI Takahide, TERASHIMA Hiroshi, TSUBOI Nobuyuki, OZAWA Kohei

Journal of Evolving Space Activities ( International Symposium on Space Technology and Science ) 1 ( 0 ) n/a 2023.01

Language：English Publishing type：Research paper (scientific journal)

The present study numerically investigates the flow fields of the twin- and tandem-jet in crossflow (JIC) under supercritical pressure. An ILES/RANS method is applied. In the present JIC, cryogenic hydrogen jets are vertically injected to warm temperature hydrogen crossflow through circular injector holes. The results show that the penetration of cryogenic jets into the crossflow is more enhanced with the tandem-jet than with the twin-jet. The higher jet penetration with the tandem jets is caused by a downstream jet behavior less influenced by the crossflow. Nevertheless, a mixedness analysis indicates that the mixing state at a downstream position is almost similar between the tandem and twin jets.

DOI： 10.57350/jesa.29

CiNii Research

Visualization of the physical destruction process of additive-manufactured regression sensor structures Reviewed International journal

Ozawa Kohei, Neki Tomoya, Tsuboi Nobuyuki

Science and Technology of Energetic Materials ( Japan Explosives Society ) 84 ( 2 ) 24 - 31 2023.01

Authorship：Last author Language：English Publishing type：Research paper (scientific journal)

Advanced closed-loop control of thrust and mixture ratio of hybrid rockets can be realized by combing a fuel mass flow rate control technique with a real-time fuel regression measurement. One of the promising techniques to realize real-time fuel regression measurement is the multi-material-additive-manufactured solid fuel with an integrated sensor probe structure. In this work, the destruction process of its regression sensor structure was visualized by the high-speed video from the top view of the sensor structure. The acquired high-speed video revealed the destruction process and its relationship with the time history of the voltage on the sensor structure. One of the findings is that unevenness or bumps of the rung form hot spots with strong emission, leading to the dropping-off and entrainment of the fragmented rung into the diffusion flame. Another important finding is that the destruction process of the rung starts before the rapid voltage increase, but it precedes the more intensive and frequent destruction. The post-processing of the sequential frames of the high-speed video successfully provided the observation of the fuel surface behind the diffusion flames. These reconstructed videos visualized the motions of the fragmented rung remaining on the fuel surface. The physical destruction process of the regression sensor structure revealed in this study can contribute to the improvement of the sensor structure design to avoid the unexpected off-nominal responses previously observed.

DOI： 10.34571/stem.84.2_24

CiNii Research

Validation of Soave–Redlich–Kwong equation of state coupled with a classical mixing rule for sound speed of non-ideal gas mixture of oxygen-hydrogen as liquid rocket propellants Reviewed International journal

TAKAHASHI Ryuji, TSUBOI Nobuyuki, TOKUMASU Takashi, TSUDA Shin-ichi

Journal of Thermal Science and Technology ( The Japan Society of Mechanical Engineers and The Heat Transfer Society of Japan ) 18 ( 1 ) 22-00365 - 22-00365 2023.01

Language：English Publishing type：Research paper (scientific journal)

Numerical simulations of inlet jets flow of propellants in the main combustion chamber equipped in a liquid rocket engine have been conducted by compressible CFD technics employing a van der Waals-type equation of state (EOS) and chemical reaction models. Various simulations have been already conducted both for combustion and non-combustion state in the chamber; however, the accuracy of EOS for the mixture of propellant employing a classical mixing rule (CMR), particularly for the sound speed, has not been understood well. Therefore, we have validated the applicability of Soave–Redlich–Kwong (SRK) EOS as one of the van der Waals-type EOSs coupled with the CMR for the sound speed using molecular dynamics (MD) simulations against an imaginary model of oxygen-hydrogen mixture system. We found that SRK EOS coupled with a well-employed CMR can reproduce the sound speed in the MD simulations within a relative error of several percent and that the CMR hardly increases the deviation of the SRK EOS in the single component. The present results suggest that the SRK EOS with the CMR cannot be the main factor to cause critical errors in the CFD based on RANS, which will give reliability to current CFD simulations for internal flows in a combustion chamber of a liquid rocket engine.

DOI： 10.1299/jtst.22-00365

Scopus

CiNii Research

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85145967290&origin=inward

3D Evaluation of Premixed Gas Injection Ports Number on Flow Field in Disk RDE Reviewed International journal

Ito T., Tsuboi N., Ozawa K., Hayashi A.K.

AIAA SciTech Forum and Exposition, 2023 2023.01

Numerical Study on Pressure Gain of Rotating Detonation System Reviewed International journal

Koichi Hayashi A., Ito T., Tsuboi N., Ozawa K., Ishii K., Dzieminska E., Obara T., Maeda S., Mizukaki T.

AIAA SciTech Forum and Exposition, 2023 2023.01

Numerical study on unsteady characteristics of high-pressure hydrogen jet ejected from a pinhole Reviewed

Asahara M., Iwasa T., Tsuboi N., Hayashi A.K.

International Journal of Hydrogen Energy 47 ( 74 ) 31709 - 31728 2022.08

Numerical Analysis on Ammonia / Hydrogen / Air Detonation Using Detailed Chemical Reaction Model Reviewed International journal

G. Inoue, N. Tsuboi, K. Ozawa, A.K. Hayashi

28th International Colloquium on the Dynamics of Explosions and Reactive systems Paper 94 2022.06

Operation Characteristics of a Disk-Type Rotating Detonation Engine Reviewed International journal

K. Ishii, K. Ohno, H. Kawana, K. Kawasaki, A.K. Hayashi, N. Tsuboi

28th International Colloquium on the Dynamics of Explosions and Reactive systems Paper 203 2022.06

Numerical Analysis on Pressure Gain of Rotating Detonation Engine Using H2-O2 Gases: Influence of Number of Injector Reviewed International journal

A.K. Hayashi, K. Yoshidomi, K. Ozawa, N. Tsuboi, H. Kawashima

28th International Colloquium on the Dynamics of Explosions and Reactive systems Paper 218 2022.06

Experimental and Numerical Study on Disc-RDE: Relation between Number of Detonation Wave and Pressure Reviewed International journal

Koichi Hayashi A., Ohno K., Ishii K., Shimomura K., Tsuboi N., Ozawa K., Jourdaine N.H., Dzieminska E., Obara T., Maeda S., Mizukaki T.

AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2022 2022.01

Numerical Simulation on Rotating Detonation Engine: Effect of Number of Injection Ports in Non-Premixed H2-O2 Gases Reviewed International journal

Yoshidomi K., Kurita N., Ozawa K., Tsuboi N., Hayashi A.K., Kawashima H.

AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2022 2022.01

Numerical Simulation of Jet Mixing in Supersonic Crossflow: Effect of Jet Exit Geometry Reviewed International journal

IWASA Toshihiro, TSUBOI Nobuyuki

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES ( THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES ) 65 ( 4 ) 172 - 184 2022.01

Authorship：Last author Language：English Publishing type：Research paper (scientific journal)

Implicit large-eddy simulation/Reynolds-averaged Navier-Stokes hybrid simulation of sheet-like hydrogen jets in a supersonic crossflow are performed to investigate jet mixing, focusing on the difference in flow structures between sheet-like jets and round jets. The simulation is validated with a helium jet experiment in terms of the mean concentration. The numerical results showed good agreement with the experimental results. A characteristic of injection from the sheet-like jet exit is the spread of the windward jet toward the spanwise direction owing to the strong interaction with the freestream, while the leeward jet highly penetrated the freestream. In the investigation on jet mixing using different jet exit geometries, it was found that the sheet-like jet has a lower mixing efficiency compared with the round jet. The two mixing characteristics of the sheet-like jet are (i) a large jet cross-sectional area, and (ii) a weak turbulent mixing in the windward shear layer. As the effect of the momentum flux ratio on the jet mixing with sheet-like jet port, the mixing is enhanced with increasing the momentum flux ratio.

DOI： 10.2322/tjsass.65.172

CiNii Research

Attempts of Time-Resolved Fuel Regression Measurements of an Altering-Swirling-Oxidizer-Flow-Type Hybrid Rocket Motor Reviewed International journal

Ozawa K., Omiya K., Tsuboi N., Ishii K.

AIAA AVIATION 2022 Forum 2022.01

Numerical Simulation of the Deflagration to Detonation Transition in a Tube with Repeated Obstacles: Experimental Scale Simulation Using the Artificial Thickened Flame Method Reviewed International journal

Transactions on Aerospace Research 4 ( 265 ) 41 - 53 2021.12

Numerical investigation of three deflagration-to-detonation transition conditions related to the velocity of the spontaneous reaction wave Reviewed

Tang X., Dziemińska E., Hayashi A.K., Tsuboi N.

International Journal of Hydrogen Energy 46 ( 75 ) 37487 - 37501 2021.10

Time-resolved fuel regression measurement function of a hybrid rocket solid fuel integrated by multi-material additive manufacturing Reviewed

Ozawa K., Wang H.w., Yoshino T., Tsuboi N.

Acta Astronautica 187 89 - 100 2021.10

Experimental and numerical study on disc-rde: Flow structure and its performances Reviewed

Hayashi A.K., Ishii K., Watanabe T., Tsuboi N., Ozawa K., Jourdaine N.H., Dzieminska E., Tang X., Obara T., Maeda S., Mizukaki T.

AIAA Scitech 2021 Forum 1 PartF 1 - 12 2021.01

Research and Development of Visualization System for Wax Fuel Regression Rate under Acceleration Environments

NAGASAKA Haruka, OZAWA Kohei, TSUBOI Nobuyuki, NAKATA Daisuke

The Proceedings of Conference of Kyushu Branch ( The Japan Society of Mechanical Engineers ) 2021 ( 0 ) 2021.01

Regression behavior of polylactic acid manufactured by fused filament fabrication for hybrid rocket propulsion Reviewed International journal

Ozawa Kohei, Wang Han-wei, Inenaga Takefumi, Tsuboi Nobuyuki

Science and Technology of Energetic Materials ( Japan Explosives Society ) 82 ( 6 ) 170 - 177 2021.01

Authorship：Last author Language：English Publishing type：Research paper (scientific journal)

Advanced closed-loop control of thrust and mixture ratio of hybrid rockets is planned by combing a fuel mass flow rate control technique with a real-time fuel regression measurement. The latter technique is enabled by a multi-materialadditive-manufactured solid fuel with an integrated sensor probe structure. This work investigated the fuel regression behavior of polylactic acid (PLA) fuel used for the main material of this type of solid fuels. Rectangular slab fuels and cylindrical fuel grains were manufactured by Fused Filament Fabrication (FFF) and fired in an optically accessible slab burner and a lab-scale motor, respectively. The cylindrical fuel grains had more than 2 times larger regression rates than rectangular slab fuels even with the same PLA filament. One of the main factors causing this large difference can be an anisotropy in the fuel regression rate behavior of the solid fuels manufactured by FFF.

DOI： 10.34571/stem.82.6_170

CiNii Article

CiNii Research

Other Link： http://hdl.handle.net/10228/00008705

3D numerical study on flow field in disc-RDE Reviewed International journal

Hayashi A.K., Shimomura K., Tsuboi N., Ozawa K., Jourdaine N.H., Ishii K., Dzieminska E., Obara T., Maeda S., Mizukaki T.

AIAA Propulsion and Energy Forum, 2021 2021.01

Numerical simulations on propane/oxygen detonation in a narrow channel using a detailed chemical mechanism: formation and detailed structure of irregular cells Reviewed International journal

Takeshima N., Ozawa K., Tsuboi N., Hayashi A.K., Morii Y.

Shock Waves 30 ( 7-8 ) 809 - 824 2020.11

Recent Experimental and Numerical Study on Disc-Type RDEs Reviewed International journal

A. K. Hayashi, N. Tsuboi, K. Ozawa, T. Watanabe, N.H. Jordaine, K. Ishii, H. Kawana, W. Kuwata, K. Ohno, T. Obara, S. Maeda, E. Dzieminska, X. Tang, T. Mizukaki

2020 AIAA SciTech AIAA-2020-1169 2020.01

Numerical Simulation on Disk Rotating Detonation Engine: Influence of Internal Flow Field Structure on Performance Reviewed International journal

Tomohiro Watanabe, Kodai Shimomura, Nicolas H. Jourdaine, Kohei Ozawa, Nobuyuki Tsuboi, Takayuki Kojima, Kazuhiro Ishii, A. Koichi Hayashi

AIAA Scitech 2020 Forum AIAA-2020-2160 2020.01

Three-Dimensional Numerical Simulation on Hydrogen/Air Rotating Detonation Engine with Aerospike Nozzle: Effects of Nozzle Geometries Reviewed International journal

Nobuhiro Kurita, Nicolas Jourdaine, Nobuyuki Tsuboi, Kohei Ozawa, A. Koichi Hayashi

2020 AIAA SciTech AIAA-2020-0688 2020.01

Study on Multi-material 3D Printed Solid Fuels with a Regression Measurement Function

OZAWA Kohei, WANG Han-wei, TSUBOI Nobuyuki

The Proceedings of the Space Engineering Conference ( The Japan Society of Mechanical Engineers ) 2020 ( 0 ) 2020.01

Language：English Publishing type：Research paper (conference, symposium, etc.)

Prototype solid fuels for a hybrid rocket were fabricated by using a multi-material 3D printer and conductive thermoplastic composite to construct a ladder-shaped resistance inside the electrically-insulated thermoplastic solid fuel and to measure the time-resolved fuel regression. In this type of fuels, the remaining fuel thickness is monitored by the voltage applied to the resistance that changes according to the number of rungs of the ladder-shaped resistor. For comparison with the proposed measurement, the time-resolved fuel regression was optically measured by using a high-speed video visualization. The solid fuel regression history with the proposed technique agreed well with that with the optical measurement considering the uncertainties in the measurement methods. Errors that cannot be explained by these uncertainties were found to be ±0.15 [mm], corresponding to ±1 layer of the stacking pitch of the 3D printer applied in this study. This paper also shows a preliminary firing test result using a post-processed 3D-printed cylindrical solid fuel grain as a preparation for the application of the proposed technique to the cylindrical solid fuel.

DOI： 10.1299/jsmesec.2020.29.C1

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130008064623

Three-dimensional numerical simulation on hydrogen/air rotating detonation engine with aerospike nozzle: Effects of nozzle geometries Reviewed

Kurita N., Jourdaine N., Tsuboi N., Ozawa K., Hayashi A.K., Kojima T.

AIAA Scitech 2020 Forum 1 PartF 2020.01

Recent experimental and numerical study on disc-type rdes Reviewed

Hayashi K., Tsuboi N., Ozawa K., Watanabe T., Jourdaine N.H., Ishii K., Kawana H., Kuwata W., Ohno K., Obara T., Maeda S., Dzieminska E., Tang X., Mizukaki T.

AIAA Scitech 2020 Forum 1 PartF 2020.01

Numerical study on JP-10/air detonation and rotating detonation engine Reviewed International journal

Hayashi A.K., Tsuboi N., Dzieminska E.

AIAA Journal 58 ( 12 ) 5078 - 5094 2020.01

Accuracy of real-time fuel regression measurement function of a 3d printed solid fuel Reviewed

Ozawa K., Wang H.W., Inenaga T., Tsuboi N.

AIAA Propulsion and Energy 2020 Forum 1 - 15 2020.01

Real-time regression rate measurement of an additive-manufactured functional hybrid rocket fuel Reviewed International journal

Ozawa, K, Wang, H.-W., Yoshino, T., Tsuboi, N.

70th International Astronautical Congress, IAC 2019 2019.10

Boundary-layer combustion of wax-based fuels at various chamber pressures under two static acceleration environments Reviewed International journal

Ozawa, K., Yoshino, T., Wang, H.-W., Tsuboi, N.

AIAA Propulsion and Energy Forum and Exposition 2019 AIAA-2019-4100 2019.08

A Study on Operating Conditions of Disk-Type Rotating Detonation Engine Reviewed International journal

H. Kawana, W. Kurata, K. Ohno, K. Ishii, A. K. Hayashi, N. Tsuboi, K. Ozawa, T. Obara, S. Maeda, E. Dzieminska, T. Mizukaki

27th International Colloquium on the Dynamics of Explosions and Reactive System 415 2019.08

Gradient Mechanism on the Onset of Detonation in the Deflagration to Detonation Transition Reviewed International journal

X. M. Tang, E. Dzieminska, A.K. Hayashi, N. Tsuboi

27th International Colloquium on the Dynamics of Explosions and Reactive System 247 2019.08

Simulation of detonation propagation in a two-phase gas/liquid cross flow injection Reviewed International journal

Nicolas Jourdaine, Nobuyuki Tsuboi, A. Koichi Hayashi, Xinmeng Tang, Kohei Ozawa

27th International Colloquium on the Dynamics of Explosions and Reactive System 435 2019.08

Two-dimensional Numerical Simulations on Unstable Propagation of Propane/Oxygen Detonation Using Detailed Chemical Mechanism Reviewed International journal

Naomi Takeshima, Kohei Ozawa, Nobuyuki Tsuboi, Youhi Morii, A. Koichi Hayashi

27th International Colloquium on the Dynamics of Explosions and Reactive System 268 2019.08

Two-dimensional Numerical Simulation of Flame Acceleration and Deflagration-to-Detonation Transition in Channels with Obstacles: Effects of Blockage Ratio and Channel Size Reviewed International journal

Kanta Iwasaki, Ayu Ago, Nobuyuki Tsuboi, Kohei Ozawa, A. Koichi Hayashi

27th International Colloquium on the Dynamics of Explosions and Reactive System 267 2019.08

Mixing characteristics of the slit-shaped hydrogen jet in supersonic crossflow Reviewed International journal

Toshihiro Iwasa, Nobuyuki Tsuboi

32nd International Symposium on Shock Waves OR-21-0357 2019.07

Feasibility Study of a Real-time Fuel Regression Rate Measurement using an Electrostatic Capacitive Probe for Hybrid Rocket Engine Reviewed

Han-Wei Wang, Kohei Ozawa, Nobuyuki Tsuboi

32nd International Symposium on Space Technology and Science 2019 a91363 2019.06

Numerical Study on Cryogenic Jet/Crossflow Interaction Structures under a Supercritical Pressure Reviewed

Taishi Amano, Takahide Araki, Hiroshi Terashima, Daiki Muto, Kohei Ozawa, Nobuyuki Tsuboi

32nd International Symposium on Space Technology and Science (ISTS) a91387 2019.06

Validation of classical mixing rule coupled with van der Waals type equation of state for sound speed of non-ideal gas mixture

Ryuji Takahashi, Nobuyuki Tsuboi, Takashi Tokumasu, Satoshi Watanabe and Shin-ichi Tsuda

American Physical Society March Meeting 2019 R18.00010 2019.03

Three-dimensional numerical thrust performance analysis of hydrogen fuel mixture rotating detonation engine with aerospike nozzle Reviewed

37 ( 3 ) 3443 - 3451 2019.01

Three-dimensional numerical simulation of disk rotating detonation engine: Unsteady flow structure Reviewed

2019.01

Development of a high efficiency system with a rotating detonation engine for a gas turbine engine (RDE-GTE) using pressure gain combustion Reviewed

2019.01

Effects of a recess on supercritical co-flowing planar jets Reviewed

62 ( 4 ) 203 - 212 2019.01

Two-dimensional Numerical Simulations on Hydrogen/Oxygen Detonation Transition in a Channel with Obstacles: Comparison with Experiment

IWASAKI Kanta, AGO Ayu, TSUBOI Nobuyuki, OZAWA Kohei, Koichi A. Koichi

The Proceedings of Conference of Kyushu Branch ( The Japan Society of Mechanical Engineers ) 2019 ( 0 ) 2019.01

Language：Japanese Publishing type：Research paper (conference, symposium, etc.)

Detonation is a type of premixed combustion, which propagates interacting with shock waves and combustion flames at supersonic speed. It is known in the early researches that DDT (Deflagration to Detonation Transition) in a channel is promoted by installing obstacles. This research investigates flame propagation and local explosions in channels filled with hydrogen/oxygen stoichiometric mixture and installed ten obstacles by using the two-dimensional simulation with a detailed reaction model. Furthermore, we estimate differences between the three-dimensional experiments performed in a past study and the present two-dimensional simulations. The simulations performed by changing the scale of the channel, grid width, and obstacle height. As a result, the flames did not transit to detonation under any conditions of the obstacle heights and channel sizes, unlike the experiments. Higher obstacles disturbed the flame propagation and induced the shock waves crossing the channel, which lead to the enhancement and acceleration of the combustion reaction. A small local explosion was observed near the eighth obstacle at one-tenth the size. The flame acceleration was faster in the experiment than in the numerical analysis.

DOI： 10.1299/jsmekyushu.2019.72.B14

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130007801915

A 3-D LES/RANS Simulation of Cryogenic-Jet/Crossflow Interactions under a Supercritical Pressure

AMANO Taishi, ARAKI Takahide, TERASHIMA Hiroshi, MUTO Daiki, TSUBOI Nobuyuki

The Proceedings of Conference of Kyushu Branch ( The Japan Society of Mechanical Engineers ) 2019 ( 0 ) 2019.01

Language：Japanese Publishing type：Research paper (conference, symposium, etc.)

The engine cycle of a Japanese next flagship liquid rocket applies an expander bleed cycle and it has a component called mixer. In the mixer, cryogenic hydrogen is vertically injected through the perforated plate into the high temperature hydrogen flow under supercritical pressures. It is important to complete mixing efficiently in the mixer because insufficient mixing may lead to non-uniform temperature distribution and thereby cause combustion instabilities in the chamber. The objective of this study is to investigate flow structures and mixing of a cryogenic jet injected into the crossflow under a supercritical pressure using a three-dimensional LES/RANS hybrid model. The results found that periodic vortex structures are formed around the jet and they have dominant role on near jet mixing processes. The shedding vortices penetrate into a region behind the jet, establishing a recirculation region. There are some differences in the jet height and the recirculation region, compared with those in a two-dimensional calculation.

DOI： 10.1299/jsmekyushu.2019.72.D12

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130007801950

Ab-initio validation of a cubic equation of state with classical mixing rule for oxygen-hydrogen mixture system focusing on its intermolecular interaction between the different kinds

TAKAHASHI Ryuji, TSUBOI Nobuyuki, TOKUMASU Takashi, WATANABE Satoshi, TSUDA Shin-ichi

The Proceedings of Mechanical Engineering Congress, Japan ( The Japan Society of Mechanical Engineers ) 2019 ( 0 ) 2019.01

Language：Japanese Publishing type：Research paper (conference, symposium, etc.)

In compressible computational fluid dynamics (CFD) analyses for combustion chamber of liquid rocket engine, the combination of cubic type equation of state (EOS) and classical mixing rule (CMR) is mostly used as typical EOS for mixture system. However, validation of the EOS for the mixture of liquid rocket propellant has hardly been validated due to lack of experimental data. Previously, validation of cubic type EOS with CMR was conducted by molecular simulation applying an ab-initio intermolecular potential as a quantum chemical approach. However, the accuracy of the H2-O2 potential is questionable because it was constructed on the basis of molecular orbital (MO) calculation for some limited molecular orientations. Therefore, in this study, we performed MO calculations for more molecular orientations between H2-O2 and reconstructed the intermolecular potential on the basis of the results of MO calculations with CCSD(T)/augcc-PVQZ level of theory. Next, we revalidated cubic type EOS coupled with CMR by evaluating the thermophysical properties of supercritical oxygen-hydrogen mixture system using Monte Carlo (MC) simulations applying the improved H2-O2 potential. As a result, we confirmed that cubic type EOS coupled with CMR can roughly reproduce the thermophysical properties obtained from MC simulation. Therefore, it was suggested that cubic type EOS with CMR can be applied to CFD analyses for combustion chamber of liquid rocket engine.

DOI： 10.1299/jsmemecj.2019.J05412

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130007816327

New Visualization of Detonation Cell Structure in Methane/Oxygen Mixture and Detailed Measurement of Galloping Detonation Velocity Oscillation

HISAKADO Kohei, OZAWA Kohei, TSUBOI Nobuyuki, Koichi A. Koichi

The Proceedings of Conference of Kyushu Branch ( The Japan Society of Mechanical Engineers ) 2019 ( 0 ) 2019.01

Language：Japanese Publishing type：Research paper (conference, symposium, etc.)

In order to understand the detailed mechanism of galloping detonation of methane and oxygen, efforts were made to improve the cellular structure and propagation velocity of unsteady detonation. Firstly, as an alternative to smoked foil method, a new visualization of cell structure was attempted using CB film, mylar film covered by carbon black with spray-type adhesive. CB film succeeded in recording cell structure, and this result suggests a potential to apply for image recognition of the cell structure using strong backlight at scanning CB film. Secondly, the correlation between the cell structure and the propagation velocity in a galloping detonation was investigated by combining the detonation velocity measurement and smoked foil method. The propagation velocity distribution was measured using twice the sampling points in the same detonation tube length as in our previous research. This experiment revealed that, after the over-driven detonation started to decelerate, small non-uniform cell structure was formed and transited to spinning mode during the deceleration. Consequently, in galloping detonation, a strong correlation was found between wave-front acceleration and cell structure.

DOI： 10.1299/jsmekyushu.2019.72.D13

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130007801952

Real-time regression rate measurement of an additive-manufactured functional hybrid rocket fuel Reviewed

Ozawa K., Wang H.W., Yoshino T., Tsuboi N.

Proceedings of the International Astronautical Congress, IAC 2019-October 2019.01

Boundary-layer combustion of wax-based fuels at various chamber pressures under two static acceleration environments Reviewed

Ozawa K., Yoshino T., Wang H.W., Tsuboi N.

AIAA Propulsion and Energy Forum and Exposition, 2019 2019.01

Numerical Study on Aerodynamic Characteristics of Reusable Vehicle-eXperiment Rocket with Body-flap during Gliding

Yoshiki Nishikawa, Nobuyuki Tsuboi, Takashi Ito, Satoshi Nonaka

15th International Conference on Flow Dynamics GS1-30 2018.11

Statistical mechanical evaluation of thermophysical properties of oxygen-hydrogen mixture system based on the differential hierarchy of a complete thermodynamic function

Ryuji Takahashi, Nobuyuki Tsuboi, Takashi Tokumasu and Shin-ichi Tsuda

Fifteenth International Conference on Flow Dynamics CRF-58 2018.11

Numerical Simulations of Hydrogen Jet Mixing in Supersonic Crossflow for Liquid Rocket Commanded Destruction

Toshihiro Iwasa, Keiichiro Fujimoto, Daiki Muto, Nobuyuki Tsuboi

12th Asian Computational Fluid Dynamics Conference 0104 2018.10

Two-Dimensional Numerical Simulation of Detonation Transition with Multi-Step Reaction Model: Effects of Obstacle Height Reviewed

A. Ago, N. Tsuboi, E. Dzieminska, A. K. Hayashi

Combustion Science and Technology 191 659 - 675 2018.08

Numerical investigation of a high pressure hydrogen jet of 82 MPa with adaptive mesh refinement: Concentration and velocity distributions Reviewed

43 ( 18 ) 9094 - 9109 2018.05

Three-dimensional numerical simulation on hydrogen-oxygen rotating detonation engine with unchoked aerospike nozzle Reviewed

( 210059 ) 2018.01

Visualization of boundary layer combustion of wax-based fuels in vertical and horizontal configurations Reviewed

2018.01

Validation of classical mixing rule coupled with a van der Waals-type equation of state for supercritical mixture system of oxygen and hydrogen using molecular simulation Reviewed

TAKAHASHI Ryuji, TSUBOI Nobuyuki, TOKUMASU Takashi, TSUDA Shin-ichi

Mechanical Engineering Letters 2018.01

Numerical prediction of forced-ignition limit in high-pressurized hydrogen jet flow through a pinhole Reviewed

Makoto Asahara, Nobuyuki Tsuboi, N., Fujimoto, K., Muto, D., Hayashi, A.K.

Intermational Conference on Hydrogen Safety ID193 2017.09

A molecular dynamics study of nuclear quantum effect on diffusivity of hydrogen molecule Reviewed

147 ( 2 ) 2017.07

Numerical Study on Effects of Obstacle Shape on Detonation Transition Mechanism Reviewed

A. Ago, T. Niibo, N. Tsuboi, A.K. Hayashi

26th International Colloquium on the Dynamics of Explosions and Reactive systems 1027 2017.07

Numerical Analysis on Liquid JP10 Rotating Detonation Engine Reviewed

A.K. Hayashi, W. Yoshida, M. Asahara, N. Tsuboi

26th International Colloquium on the Dynamics of Explosions and Reactive systems 2017.07

Two-Dimensional Numerical Analysis on Shock Flame Interaction in Premixed Gas of Hydrocarbon/Oxygen with Multi-Step Reaction Model Reviewed

M. Iwai, K. Yoshida, Y. Morii, N. Tsuboi, A.K. Hayashi

26th International Colloquium on the Dynamics of Explosions and Reactive systems 1050 2017.07

Experimental Study on Behavior of Methane/Oxygen Gas Detonation Near Propagation Limit in Small Diameter Tube: Effects of Equivalent Ratio Reviewed

K. Yoshida, T. Inoue, Y. Morii, K. Murakami, N. Tsuboi, A.K. Hayashi,

26th International Colloquium on the Dynamics of Explosions and Reactive systems 822 2017.07

Numerical Simulations of Transverse Jet in Supersonic Crossflow toward an Understanding of Interaction Mechanism Reviewed

Toshihiro Iwasa, Keiichiro Fujimoto, Daiki Muto, Nobuyuki Tsuboi

31st International Symposium Shock Waves 2017.07

Numerical investigation of a high pressure hydrogen jet of 82 MPa with adaptive mesh refinement: The starting transient evolution and Mach disk stabilization Reviewed

42 ( 10 ) 7120 - 7134 2017.03

Three-dimensional numerical simulation on dispersion process of unsteady high pressure hydrogen jet flow Reviewed

2017.01

Numerical simulation for effects of pressure on cryogenic coaxial jet under supercritical pressure Reviewed

2017.01

Front cellular structure and thrust performance on hydrogen-oxygen rotating detonation engine Reviewed

33 ( 1 ) 100 - 111 2017.01

Three-Dimensional Numerical Simulation of a Rotating Detonation Engine: Effects of the Throat of a Converging-Diverging Nozzle on Engine Performance Reviewed

188 ( 11-12 ) 2105 - 2116 2016.12

Study on Behavior of Methane/Oxygen Gas Detonation Near Propagation Limit in Small Diameter Tube: Effect of Tube Diameter Reviewed

188 ( 11-12 ) 2012 - 2025 2016.12

Numerical Study on Direct Initiation of Cylindrical Detonation in H<inf>2</inf>/O<inf>2</inf> Mixtures: Effect of Higher-Order Schemes on Detonation Propagation Reviewed

188 ( 11-12 ) 2044 - 2059 2016.12

D-08 Numerical Simulations of Jet/Free-stream Interaction Structures on Liquid Rocket Tank Destruction

IWASA Toshihiro, MUTO Daiki, FUJIMOTO Keiichiro, TSUBOI Nobuyuki

2016 ( 69 ) 141 - 142 2016.03

E-23 Validation of Classical Mixing Rule in Supercritical Mixture System by Molecular Simulation

TANIGUCHI Masaoki, TSUDA Shinichi, TSUBOI Nobuyuki

2016 ( 69 ) 215 - 216 2016.03

Numerical Analyses on Ethylene/Oxygen Detonation with Multi-step Chemical Reaction Mechanisms: Grid Resolution and Chemical Reaction Model Reviewed

Takayuki Araki, Keisuke Yoshida, Youhi Morii, Nobuyuki Tsuboi, A. Koichi Hayashi

Combustion Science and Technology 188 ( 3 ) 346 - 369 2016.03

Numerical simulation of jet mixing in a recessed coaxial injector at supercritical pressure Reviewed

2016.01

Numerical simulation of the effects of nozzle on thrust performance of rotating detonation engine Reviewed

77 ( 5-6 ) 122 - 127 2016.01

Drag Reduction Method for a Cylinder Using an Airfoil with a Free Rotating Shaft Reviewed

SATO Kazushi, FUKIBA Katsuyoshi, TSUBOI Nobuyuki

JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 64 ( 3 ) 153 - 159 2016.01

Characteristics of Jet-Mixing at Supercritical Pressure: Effects of Recess Length and Post Height Reviewed

14 ( 30 ) Pa_45 - Pa_52 2016.01

極低温超臨界圧下の噴流に関する流体力学とその数値解析

坪井伸幸

日本燃焼学会誌 ( 日本燃焼学会 ) 57 ( 182 ) 257 - 264 2015.11

D121 Mechanism of Self-Ignition Induced by High-Pressure Hydrogen Jet in a Tube

Asahara Makoto, Yokoyama Akinori, Kubota Tomoyuki, Saburi Tei, Wada Yuji, Mogi Toshio, Tsuboi Nobuyuki

Procee[d]ings of Thermal Engineering Conference 2015 "D121 - 1"-"D121-2" 2015.10

Numerical simulation on low-speed hydrogen jet diffusion Reviewed

Yuki Takatori, Nobuyuki Tsuboi, Keisuke Fujimoto, Daiki Muto, Makoto Asahara

The 6th International Conference on Hydrogen Safety ID179 2015.10

J0540307 Molecular Dynamics Analysis of static and dynamic fluctuation structure of diatomic fluids around the critical point

Ikawa Shohei, Nagashima Hiroki, Tsuboi Nobuyuki, Tokumasu Takashi, Tsuda Shin-ichi

Mechanical Engineering Congress, Japan 2015 "J0540307 - 1"-"J0540307-5" 2015.09

Three-dimensional cellular structure and propagation process of spherical detonation Reviewed

R. Iida, M. Asahara, A. Hayashi, N. Tsuboi

25th International Colloquium on the Dynamics of Explosions and Reactive Systems No.273 2015.08

Behavior of Methane/Oxygen Gas Detonation near Propagating Limit in Small Diameter Tube:Effect of Tube Diameter Reviewed

K. Yoshida, K. Hayashi, Y. Morii, K. Murakami, A. Susa, N. Tsuboi, A. Hayashi

25th International Colloquium on the Dynamics of Explosions and Reactive Systems No.139 2015.08

3D Numerical Simulation on Rotating Detonation Engine: Effects of Converging-Diverging-Nozzle on Thrust Performance Reviewed

Seiichiro ETO, Yusuke WATANABE, Nobuyuki TSUBOI, Takayuki KOJIMA, A. Koichi HAYASHI

25th International Colloquium on the Dynamics of Explosions and Reactive Systems No.132 2015.08

Numerical Study on Direct of Cylindrical Detonation in H2/O2 Mixture: Influence of Higher-order Scheme Reviewed

Tomotaka NIIBO, Youhi MORII, Nobuyuki TSUBOI, Makoto ASAHARA, A. Koichi HAYASHI

25th International Colloquium on the Dynamics of Explosions and Reactive Systems No.136 2015.08

デフラグレーションからデトネーションへの遷移過程における新展開 -音速近傍で伝播する火炎の存在-

朝原誠，坪井伸幸，石井一洋，林光一

Explosion ( 日本火薬学会 ) 25 ( 1 ) 16 - 21 2015.04

円筒デトネーションの伝播過程とセル構造に関する数値解析 Reviewed

朝原誠，飯田遼平，林光一，坪井伸幸

Explosion 25 ( 1 ) 8 - 15 2015.04

Extraction of the Density Fluctuations in Diatomic Fluids Around the Critical Points Using Molecular Dynamics Simulation Reviewed

Shin-ichi Tsuda, Masato Tomi, Nobuyuki Tsuboi, Shohei Ikawa, and Takashi Tokumasu

Journal of Nanoscience and Nanotechnology 15 ( 4 ) 3117 - 3120 2015.04

Numerical simulation of propagation process and cellular structure of cylindrical detonation Reviewed

25 ( 1 ) 8 - 15 2015.01

New page of deflagration to detonation transition - Flame propagation around a speed of sound Reviewed

25 ( 1 ) 16 - 21 2015.01

Reactive fluid Dynamics laboratory Department of Mechanical and Control Engineering, Faculty of Engineering, Kyushu Institute of Technology

Tsuboi N.

Explosion ( Explosion ) 25 ( 3 ) 198 - 199 2015.01

Three-Dimensional Simulation on Deflagration-to-Detonation Transition with a Detailed Chemical Reaction Model Reviewed

Takuya Machida, Makoto Asahara, A. Koichi Hayashi, Nobuyuki Tsuboi

Combustion Science and Technology 186 ( 10-11 ) 1758 - 1773 2014.12

Implementation of Weighted Compact Nonlinear Scheme for Hydrogen/Air Detonation Reviewed

Ryohei Iida, Makoto Asahara, A. Koichi Hayashi, Nobuyuki Tsuboi, Taku Nonomura

Combustion Science and Technology 186 ( 10-11 ) 1736 - 1757 2014.12

Aerodynamic Characteristics of Simplified Waveriders Reviewed

Haruka Etoh, Nobuyuki Tsuboi, Yusuke Maru, Kazuhisa Fujita

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN 12 ( ists29 ) Pg_25 - Pg_31 2014.12

Numerical simulation of auto-ignition induced by high-pressure hydrogen release with detailed reaction model: Fluid dynamic effect by diaphragm shape and boundary layer Reviewed

M.Asahara, A. Yokoyama, A.Koichi Hayashi, E. Yamada, N. Tsuboi

International Journal of Hydrogen Energy 39 20378 - 20387 2014.12

Numerical Study of Real Gas Effects on Shock Tube Problems Reviewed

Daiki Muto, Hiroshi Terashima, Nobuyuki Tsuboi

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN 12 ( ists29 ) Po_2_39 - Po_2_44 2014.12

Estimation of the Thrust Performance on a Rotating Detonation Engine for a Hydrogen-Oxygen Mixture Reviewed

Nobuyuki Tsuboi, Yusuke Watanabe, Takayuki Kojima, and A.Koichi Hayashi

Proceedings of the Combustion Institute, The Combustion Institute 35 2005 - 2013 2014.11

Spinning detonation , cross-currents, and the Chapman-Jouguet velocity Reviewed

M. Kurosaka, N. Tsuboi

Journal of Fluid Mechanics 756 728 - 757 2014.10

二原子分子流体の臨界点近傍におけるゆらぎ構造の分子動力学計算 Reviewed

冨正人，井川祥平，坪井伸幸，徳増崇，津田伸一

日本機械学会論文集 80 ( 816 ) TEP0231 2014.08

Effect of pressure-dependent detailed chemical reaction models on detonation cell size Reviewed

Koji Yamashita, Makoto Asahara, Koichi Hayashi, N. Tsuboi

Tenth International Symposium in Hazards, Preventation, and Mitigatikon of Industrial Explosion (X ISHPMIE) #65 2014.06

Multi-dimensional propagation process of diverging detonation Reviewed

Ryohei Iida, Makoto Asahara, Nobuyuki Tsuboi, Koichi Hayashi

Tenth International Symposium in Hazards, Preventation, and Mitigatikon of Industrial Explosion (X ISHPMIE) #64 2014.06

直接起爆による酸水素爆轟波の爆轟限界近傍における数値解析 Reviewed

朝原誠，林光一，坪井伸幸

Science and Technology of Energetic Materials 75 ( 4 ) 99 - 105 2014.05

An Analysis of Quantum Effects on the Thermodynamic Properties of Cryogenic Hydrogen Using the Path Integral Method Reviewed

Hiroki Nagashima, Shin-ichi Tsuda, Nobuyuki Tsuboi,A. Koichi Hayashi, and Takasih Tokumasu

THE JOURNAL OF CHEMICAL PHYSICS 134506-1-10 2014.04

Numerical study of cryogenic coaxial jet under supercritical condition Reviewed

2014.01

Numerical simulation on ignition with shock tube - Effect of reflected shock wave - Boundary layer at adiabatic wall interaction on ignition Reviewed

75 ( 1-2 ) 50 - 58 2014.01

Numerical simulation on H<inf>2</inf>-O<inf>2</inf> detonation induced by direct initiation near detonation limits Reviewed

75 ( 3-4 ) 99 - 105 2014.01

An analysis of the quantum effect on the thermodynamic and transport properties of cryogenic hydrogen using molecular dynamics method Reviewed

490 ( 1 ) 2014.01

A molecular dynamics study of nuclear quantum effect on the diffusion of hydrogen in condensed phase Reviewed

1618 950 - 953 2014.01

Numerical Study of Real Gas Effects on Shock Tube Problems at Supercritical Conditions Reviewed

MUTO Daiki, TSUBOI Nobuyuki, TERASHIMA Hiroshi

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN 12 ( 29 ) Po_2_39 - Po_2_44 2014.01

J0550204 An Analysis of Quantum Effect on the Transport Properties of Liquid Hydrogen using Molecular Dynamics Method

NAGASHIMA Hiroki, TSUDA Shinichi, TSUBOI Nobuyuki, KOSHI Mitsuo, HAYASHI Koichi, TOKUMASU Takashi

The Proceedings of Mechanical Engineering Congress, Japan ( The Japan Society of Mechanical Engineers ) 2014 ( 0 ) _J0550204 - -_J0550204- 2014.01

Language：Japanese Publishing type：Research paper (conference, symposium, etc.)

In this study, we conducted analysis of quantum effect of hydrogen molecules on the energy transport of liquid hydrogen using classical Molecular Dynamics (MD) and path integral Centroid MD (CMD) method. We performed MD simulation across a wide temperature region in the constant density and compared the thermal conductivity of each method. The thermal conductivity was calculated using non-equilibrium MD method. As a result, it was confirmed that CMD shows lower thermal conductivity than classical MD and this tendency is consistent with experimental data. Moreover, it was clarified that because of the change of intermolecular potential due to the quantum effect, the potential energy transport by molecular motion and the energy transport by intermolecular interaction decrease.

DOI： 10.1299/jsmemecj.2014._J0550204-

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/110009943927

J0550104 Evaluation of the Density Fluctuation against the Diatomic Fluids around the Critical Points using Molecular Dynamics Simulation

IKAWA Shohei, TOKUMASU Takashi, TSUBOI Nobuyuki, TSUDA Shin-ichi

The Proceedings of Mechanical Engineering Congress, Japan ( The Japan Society of Mechanical Engineers ) 2014 ( 0 ) _J0550104 - -_J0550104- 2014.01

Language：Japanese Publishing type：Research paper (conference, symposium, etc.)

In this study, we investigated the density fluctuation of diatomic fluids around the critical points for evaluation of the principle of corresponding state. We used Molecular Dynamics (MD) simulation against the 2-Center Lennard-Jones (2CLJ) fluids for extraction of structure of fluctuation around the critical points. We evaluated the density fluctuation by two methods. One is the dispersion of number of molecules at certain domain as time-averaged quantity. The other is the calculation of static structure factor. As the results, in 2CLJ fluids that have shorter molecular elongations comparatively, the principle of corresponding state is satisfied because of the small difference in the fluctuation structure extracted by the present two methods.

DOI： 10.1299/jsmemecj.2014._J0550104-

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/110009943922

G0510306 Three-Dimensional Numerical Study on Clarification of Self-Ignition Mechanism of High-Pressure Hydrogen Jet in a Tube

YOKOYAMA Akinori, ASAHARA Makoto, TSUBOI Nobuyuki

The Proceedings of Mechanical Engineering Congress, Japan ( The Japan Society of Mechanical Engineers ) 2014 ( 0 ) _G0510306 - -_G0510306- 2014.01

Language：Japanese Publishing type：Research paper (conference, symposium, etc.)

One of self-ignition mechanisms of high-pressure hydrogen jet occurs by vortex caused from instability. Several studies about self-ignition of high-pressure hydrogen spouted from a tube attached with a tank are reported. In this analysis, the numerical study is performed to find out mechanism of self-ignition of hydrogen jet in a tube with a 10mm in diameter connected to a high pressure tank of 9.0MPa. Hydrogen and air are mixed at their contact surface to yield vortices, and the mixture ignites because the high temperature and high pressure regions are yielded behind the precursor shock wave.

DOI： 10.1299/jsmemecj.2014._G0510306-

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/110009943304

G0510305 Numerical Simulation of Three-Dimensional Flow Behavior Induced by Reflected Shock Wave-Boundary Layer Interaction

WAKABAYASHI Ryo, ASAHARA Makoto, TSUBOI Nobuyuki

The Proceedings of Mechanical Engineering Congress, Japan ( The Japan Society of Mechanical Engineers ) 2014 ( 0 ) _G0510305 - -_G0510305- 2014.01

Language：Japanese Publishing type：Research paper (conference, symposium, etc.)

At the reflected shock rear, a chemical reaction starts at a temperature and pressure constant static premixed gas conditions by filling reactive premixed gas in the shock tube, and reflects the shock wave in the pipe ends. Meyer and Oppenheim were classified into ignition two forms Mild Ignition and Strong Ignition, the start of the H2/O2 detonation due to the reflected shock wave. In order to ignite instantly in the tube cross-section of the entire near-wall reflection, Strong Ignition is a form ignition reaction theory. Mild Ignition is a firing mode hydrodynamic, under the influence of lambda shock wave generated by the mutual interference between the boundary layer and are reaching the ignition shock wave backward flow becomes multidimensional. Mark was revealed from the experiment due to the mutual interference between the boundary layer and the reflected shock, lambda shock wave to be formed in connection with this phenomenon. Thus, experiments by the reflected shock ignition is performed, there are cases in which ignition occurs is unexpected due to the interference of the reflected shock wave and boundary layer. In this study, we focus on the flow field due to the interference of the boundary layer and reflected shock, it is an object of the present invention to elucidate the flow three-dimensional.

DOI： 10.1299/jsmemecj.2014._G0510305-

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/110009943303

G0510304 Three-Dimensional Numerical Analysis on Multi-Head Structure of Detonation Wave Front Propagating in Rectangular Tube

ASAHARA Makoto, NAGAO Tsuyoshi, TSUBOI Nobuyuki, HAYASHI Koinch

The Proceedings of Mechanical Engineering Congress, Japan ( The Japan Society of Mechanical Engineers ) 2014 ( 0 ) _G0510304 - -_G0510304- 2014.01

Language：Japanese Publishing type：Research paper (conference, symposium, etc.)

Three-dimensional numerical analysis using practical scale of the experiment is performed to obtain cellular structure in rectangular tube. As a result, transverse wave in three-dimensions moves in different direction comparing with two-dimensional structure at the point of propagation structure. Furthermore, each transverse wave affects to accelerate the propagation velocity in circumferential direction and makes unreacted gas pockets after transverse wave goes through each other.

DOI： 10.1299/jsmemecj.2014._G0510304-

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/110009943302

G0510303 Numerical Study on Thrust Performance of Rotating Detonation Engine

YOSHIDA Wataru, ASAHARA Makoto, TSUBOI Nobuyuki

The Proceedings of Mechanical Engineering Congress, Japan ( The Japan Society of Mechanical Engineers ) 2014 ( 0 ) _G0510303 - -_G0510303- 2014.01

Language：Japanese Publishing type：Research paper (conference, symposium, etc.)

Study of detonation engine has been actively carried out in order to improve the thrust performance and expected to apply rocket engine. Even among them, rotating detonation engine has attracted attention. Many experiments have been performed, but in the experiments, varying the combustion chamber size is difficult. In this study, the numerical study is carried out to find out thrust performance with changing combustion chamber size.

DOI： 10.1299/jsmemecj.2014._G0510303-

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/110009943301

806 Thrust Performance Estimation on Rotating Detonation Engine Using Two-dimensional Numerical Simulations : Effect of Grid Resolution on I_<sp>

WATANABE Yusuke, TSUBOI Nobuyuki, HARANO Takaya, KOJIMA Takayuki, HAYASHI A. Koichi

The Proceedings of Conference of Kyushu Branch ( The Japan Society of Mechanical Engineers ) 2014 ( 0 ) _806 - 1_-_806-2_ 2014.01

802 Numerical Study of Injector Geometry Effects on Cryogenic Coaxial Jet under Supercritical Conditions

MUTO Daiki, TSUBOI Nobuyuki, TERASHIMA Hiroshi

The Proceedings of Conference of Kyushu Branch ( The Japan Society of Mechanical Engineers ) 2014 ( 0 ) _802 - 1_-_802-2_ 2014.01

B213 A Study of the Density Fluctuation of Diatomic Fluids around the Critical Point by Molecular Dynamics Simulation

Ikawa Shohei, Tokumasu Takashi, Nobuyuki Tsuboi, Nagashima Hiroki, Tsuda Sin-ichi

The Proceedings of the Thermal Engineering Conference ( The Japan Society of Mechanical Engineers ) 2014 ( 0 ) _B213 - 1_-_B213-2_ 2014.01

Language：Japanese Publishing type：Research paper (conference, symposium, etc.)

In this study, we evaluated the density fluctuation of diatomic fluids around the critical point. We performed Molecular Dynamics (MD) simulation against 2-Center-Lenard-Jones (2CLJ) fluids that have molecular elongation as a parameter. We compared the density fluctuation of each fluid to evaluate the principle of corresponding state of density fluctuation. We evaluated the density fluctuation by dispersion of number of molecules, static structure factor, and intermediate scattering function. As the results, in 2CLJ fluids that have shorter molecular elongation comparatively, the principle of corresponding state of static fluctuation structure was satisfied.

DOI： 10.1299/jsmeted.2014._B213-1_

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/110009938965

811 Three-dimensional Numerical Simulation on Unsteady Compressible Flow in Hybrid Rocket Engine : Effect of Turbulence Model

SAKAMOTO Mai, MUTO Daiki, TSUBOI Nobuyuki

The Proceedings of Conference of Kyushu Branch ( The Japan Society of Mechanical Engineers ) 2014 ( 0 ) _811 - 1_-_811-2_ 2014.01

808 Numerical Analysis of the Aerospike Nozzle for the Evaluation of Performance : Effect of Inner Nozzle Configuration

SHIBAO Masafumi, TSUBOI Nobuyuki, ITO Takashi

The Proceedings of Conference of Kyushu Branch ( The Japan Society of Mechanical Engineers ) 2014 ( 0 ) _808 - 1_-_808-2_ 2014.01

804 Numerical Simulation on Waveriders for Thermal Effects

URA Yusuke, ETOU Haruka, TSUBOI Nobuyuki, MARU Yusuke, FUJITA Kazuhisa

The Proceedings of Conference of Kyushu Branch ( The Japan Society of Mechanical Engineers ) 2014 ( 0 ) _804 - 1_-_804-2_ 2014.01

523 Molecular Dynamics Study for the Transport Phenomena of Oxygen in Primary Pores of Catalyst Layer in Polymer Electrolyte Fuel Cell

Deguchi Masashi, Fukushima Akinori, Tuboi Nobuyuki, Tokumasu Takashi

The Proceedings of Conference of Kyushu Branch ( The Japan Society of Mechanical Engineers ) 2014 ( 0 ) _523 - 1_-_523-2_ 2014.01

219 Numerical Study of the Flow Field over Compression Corner in Hypersonic Flow : Effect of Ramp Angle

KUROKAWA Kunihiko, TSUBOI Nobuyuki, KURAMOTO Takeshi

The Proceedings of Conference of Kyushu Branch ( The Japan Society of Mechanical Engineers ) 2014 ( 0 ) _219 - 1_-_219-2_ 2014.01

1404 Numerical Simulation of Ignition Mechanism by Shock Focusing into H_2-O_2 mixture

ASAHARA Makoto, MITANI Nana, TUBOI Nobuyuki

The Proceedings of the Fluids engineering conference ( The Japan Society of Mechanical Engineers ) 2014 ( 0 ) _1404 - 1_-_1404-2_ 2014.01

Language：Japanese Publishing type：Research paper (conference, symposium, etc.)

A reflected shock wave by focusing reflector is simulated using the Navier-Stokes equations with the detailed oxy-hydrogen reaction mechanism. Into the tube which has focusing end wall, ignition successes around focal point under the no-ignition condition at the flat wall. The shock focusing is one of effective way of detonation initiation. However, the ignition mechanism from shock focusing is not clear. In this study, we aim to indicate the ignition phenomena induced by shock focusing.

DOI： 10.1299/jsmefed.2014._1404-1_

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/110009938781

102 Thrust Performance Evaluation on Rotating Detonation Engine by Using Numerical Simulation : Effect of Combustor Size and Number of Detonation Waves

Harano Takaya, Watanabe Yusuke, Tsuboi Nobuyuki, Kojima Takayuki, Hayashi Koichi

The Proceedings of Conference of Kyushu Branch ( The Japan Society of Mechanical Engineers ) 2014 ( 0 ) _102 - 1_-_102-2_ 2014.01

101 Experimental Study on Cellular Pattern of CH4 / O2 Detonation Propagating in Round Tube by Smoked Foil Technique

YOSHIDA Keisuke, MOTONAGA Takahide, MORII Youhi, MURAKAMI Kiyoto, SUSA Akio, TSUBOI Nobuyuki, HAYASHI A. Koichi

The Proceedings of Conference of Kyushu Branch ( The Japan Society of Mechanical Engineers ) 2014 ( 0 ) _101 - 1_-_101-2_ 2014.01

A molecular dynamics analysis of quantum effect on the thermodynamic properties of liquid hydrogen Reviewed

2013.12

An analysis of quantum effect on the p-V-T relation of cryogenic hydrogen using centroid molecular dynamics method Reviewed

79 ( 805 ) 1848 - 1857 2013.10

Strong and Mild Ignition Mechanism behind Reflected Shock Waves in Hydrogen Mixture Reviewed

Asahara, M., Shirakawa, Y., Hayashi, A.K. , Tsuboi, N.

5th International Conference on Hydrogen Safety No: 167 2013.09

Numerical analysis of spinning detonation dependency on initial pressure using AUSMDV scheme Reviewed

2013.08

Numerical Study on Shock Wave Interaction over Compression Corner with 30 deg. in Hypersonic Flow Reviewed

T.Kuramoto, D.Muto, N.Tsuboi, H.Nagai, K.Asai

29th International Symposium on Shock Waves #0246-000035 2013.07

Numerical Analysis of 3D-Rotating Detonation Engine Concerning Propagation Mechanism in Combustor Thickness Direction and Effect on its Performance Reviewed

Zusai K., Uemura Y., Asahara M., Yamada E., Hayashi A.K., Tsuboi N.

24th International Colloquium on the Dynamics of Explosions and Reactive Systems #251 2013.07

Detailed Hydrodynamic Instability Structure at Hydrogen/Air Detonation Front Using WCNS Scheme Reviewed

Iida R., Asahara M., Tsuboi N., Nonomura T., Hayashi A.K.

24th International Colloquium on the Dynamics of Explosions and Reactive Systems #234 2013.07

Thrust Performance Estimation on Rotating Detonation Engine Using Two-Dimensional Numerical Simulations Isp under Low-Pressure Environment Reviewed

Watanabe Y., Tsuboi N., Kojima T., Hayashi A.K.

24th International Colloquium on the Dynamics of Explosions and Reactive Systems #117 2013.07

Experimental Study on CH4/O2 Detonation Characteristics near Propagation Limit: Influence of Initial Pressure and Equivalence Ratio on Cellular Structure Reviewed

Motonaga T., Yoshida K., Morii Y., Murakami K., Susa A., Tsuboi N., Hayashi A.K.

24th International Colloquium on the Dynamics of Explosions and Reactive Systems #237 2013.07

Numerical Simulations on Propagating Process of H2/O2/H2O Cylindrical Detonation with Detailed Reaction Model Reviewed

Sugiyasu T., Morii Y., Tsuboi N., Asahara M., Hayashi A.K.

24th International Colloquium on the Dynamics of Explosions and Reactive Systems #158 2013.07

Three-Dimensional Simulation on Deflagration to Detonation Transition with a Detailed Chemical Reaction Reviewed

Machida T., Fukuda M., Asahara M., Yamada E., Hayashi A.K., Tsuboi N.

24th International Colloquium on the Dynamics of Explosions and Reactive Systems #252 2013.07

Evaluation of Chemical Reaction Models and Numerical Simulations of Detonations in C2H4/O2 Mixtures Reviewed

Araki T., Morii Y., Tsuboi N., Hayashi A.K.

24th International Colloquium on the Dynamics of Explosions and Reactive Systems #57 2013.07

Numerical Analysis on Ignition Problem behind Reflected Shock Waves in Reactive Mixture Reviewed

Asahara M., Koyama T., Hayashi A.K., Tsuboi N.

24th International Colloquium on the Dynamics of Explosions and Reactive Systems #256 2013.07

Numerical approach to one-dimensional CH<inf>4</inf>/O<inf>2</inf> detonation with the reduced chemical kinetic model DRG30 Reviewed

73 ( 5-6 ) 169 - 174 2012.09

Numerical study and performance evaluation for a pulse detonation engine with an exhaust nozzle (1st report: Estimation on performance using a detailed reaction model) Reviewed

55 ( 1 ) 51 - 59 2012.02

An estimation of thermodynamic and transport properties of cryogenic hydrogen using classical molecular simulation Reviewed

2 289 - 299 2011.12

Dependency of Equivalence Ratio on Hydrogen Cylindrical Detonation Induced by Direct Initiation Reviewed

Asahara, M., Tsuboi, N. Hayashi, A.K. and Yamada, E.

The 4th International Conference on Hydrogen Safety (ICHS) 2011, paper no.224 2011.09

Oscillating propagation of near-limit detonations of CH4/O2 system in a small diameter tubes Reviewed

2) Akio Susa, Nobuyuki Tsuboi, Takuma Endo, Youhi Morii, Hiroyuki Yokoyama, Syunsuke HASEGAWA, Yosuke OGAWA

23rd International Colloquium on the Dynamics of Explosions and Reactive Systems, Oral 313 2011.07

Detailed Shock Configuration of Cylindrical Cellular Detonation Reviewed

Makoto Asahara, Nobuyuki Tsuboi, A.Koichi Hayashi

23rd International Colloquium on the Dynamics of Explosions and Reactive Systems, Oral 324 2011.07

Numerical Simulation on Two-Dimensional Detonation including Boundary Layer Effects Reviewed

Nobuyuki Tsuboi, A.Koichi Hayashi, Youhi Morii, Mitsuo Koshi

23rd International Colloquium on the Dynamics of Explosions and Reactive Systems, Oral 187 2011.07

Physics of Detonation Propagation in Rotating Detonation Engine Reviewed

Takayuki Yamada, Nobuyuki Tsuboi, Yuho Uemura, A.Koichi Hayashi, Eisuke Yamada

23rd International Colloquium on the Dynamics of Explosions and Reactive Systems, Poster 173 2011.07

Fast Deflagration in the Smooth Tube in Hydrogen-Oxygen Mixture Reviewed

Edyta Dzieminska, Nobuyuki Tsuboi, A.Koichi Hayashi, Eisuke Yamada, Motoki Fukuda

23rd International Colloquium on the Dynamics of Explosions and Reactive Systems, Poster 185 2011.07

Two-dimensional analysis of Hydrogen/Oxygen cylindrical detonation using AUSMDV scheme Reviewed

Makoto Asahara, Nobuyuki Tsuboi, A. Koichi Hayashi, and Eisuke Yamada

Archivum Combustions 30 ( 3 ) 177 - 186 2011.04

Transition to detonation after a `volume explosion' - Oppenheim's experiment validation with a numerical calculation Reviewed

Edyta Dzieminska, Motoki Fukuda, A. Koichi Hayashi, Nobuyuki Tsuboi

Archivum Combustions 30 ( 3 ) 187 - 195 2011.04

Updated kinetic mechanism for high-pressure hydrogen combustion Reviewed

27 ( 2 ) 383 - 395 2011.03

Mechanism of high-pressure hydrogen auto-ignition when spouting into air Reviewed

36 ( 3 ) 2560 - 2566 2011.02

Numerical Study and Performance Evaluation for Pulse Detonation Engine with an Aerospike Nozzle Reviewed

N. Tsuboi, Y. Kawakami, K. Ezure, A. Hayashi, E. Yamada

AIAA-2011-800, 49th AIAA Aerospace Sciences Meeting 2011.01

Numerical Study on Detonation Characteristics Using a Bio-Fuel Reviewed

A. Hayashi, T.Shimada, E. Yamada, N. Tsuboi

AIAA-2011-582, 49th AIAA Aerospace Sciences Meeting 2011.01

Numerical analysis of threshold of limit detonation in Rotating Detonation Engine Reviewed

2010.12

Combustion characteristics of hydroxylammonium nitrate aqueous solutions Reviewed

9 ( 3 ) 219 - 231 2010.12

Numerical investigations of film cooling effect on sub-scale rocket engine performance Reviewed

53 ( 179 ) 63 - 70 2010.12

Mechanism of High Pressure Hydrogen Auto-ignition When Spouting into Air Reviewed

E.Yamada,Naoki Kitabayashi,A. Koichi Hayashi,Nobuyuki Tsuboi

International Journal of Hydrogen Energy 36 ( 2560-2566 ) 2010.04

Advanced Computer Science on Internal Ballistics of Solid Rocket Motors Reviewed

Toru SHIMADA,Kazushige KATO,Nobuhiro SEKINO,Nobuyuki TSUBOI,Yoshio SEIKE,Mihoko FUKUNAGA,Yu DAIMON,Hiroshi HASEGAWA,Hiroya ASAKAWA

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN 8 ( ists27 ) Pa_29 - Pa_37 2010.04

Detonation Limit Thresholds in H2/O2 Rotating Detonation Engine Reviewed

Takayuki Yamada,A.Koichi Hayashi,Eisuke Yamada,Nobuyuki Tsuboi,Venkat E. Tangirala,Toshi Fujiwara

Combustion Science and Technology 182 ( 11-12 ) 1901 - 1914 2010.04

90°曲管におけるH2/O2デトネーションの流体力学的効果に関する数値解析 Reviewed

坪井伸幸,阿達聡,林光一,山田英助,内田正宏,藤森俊郎,須田俊之

日本燃焼学会誌論文集 52 ( 161 ) 213 - 223 2010.04

ノーズコーンをもつ超音速機の壁面圧力を用いた機体姿勢およびマッハ数計測に関する数値解析 Reviewed

吹場活佳,坪井伸幸,小林弘明

日本航空宇宙学会論文集 58 ( 676 ) 130 - 137 2010.04

Numerical Investigations of the Film Cooling Effect on Sub-Scale Rocket Engine Performance Reviewed

Takashi ITO,Nobuyuki TSUBOI,Hiroshi MIYAJIMA

Transactions of the Japan Society for Aeronautical and Space Sciences 53 ( 179 ) 63 - 70 2010.04

排気ノズルを有するパルスデトネーションエンジンの数値解析による推力性能評価（第1報：詳細反応モデルによる基本性能の評価） Reviewed

木村勇一朗，坪井伸幸，林光一，山田英助

日本航空宇宙学会論文集 58 ( 675 ) 91 - 99 2010.04

Reliability of Classical Molecular Dynamics Method to Thermodynamic Properties of Hydrogen Reviewed

H.Nagashima, T.Tokumasu, S.Tsuda, N.Tsuboi, A.K.Hayashi

AIAA-2010-991, 48th AIAA Aerospace Sciences Meeting, 2010 2010.01

Numerical Analysis of Threshold of Limit Detonation in Rotating Detonation Engine Reviewed

T.Yamada, A.K.Hayashi, E.Yamada, N.Tsuboi, V.E.Tangirala, T.Fujiwara

AIAA-2010-153, 48th AIAA Aerospace Sciences Meeting, 2010 2010.01

Numerical Study and Performance Evaluation for Pulse Detonation Engine With Exhaust Nozzle Reviewed

N.Tsuboi,Y.Kimura,A.K.Hayashi,V.E. Tangirala

45th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, AIAA-2009-5315, 2009 2009.07

Development of Supersonic Vehicle for Demonstration of a Precooled Turbojet Engine Reviewed

Shujiro SAWAI,Kazuhisa FUJITA,Hiroaki KOBAYASHI,Shin'ichiro SAKAI,Nobutaka BANDO,Shouhei KADOOKA,Nobuyuki TSUBOI,Koji MIYAJI,Taku UCHIYAMA,Tatsuaki HASHIMOTO

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, SPACE TECHNOLOGY JAPAN 7 ( ists26 ) Tg_27 - Tg_34 2009.04

Combustion Characteristics of a Hydroxylammonium Nitrate Based Liquid Propellant. Combustion Mechanism and Application to Thrusters Reviewed

T.Katsumi,H.Kodama,T.Matsuo,H.Ogawa,N.Tsuboi,K.Hori

Combustion, Explosion, and Shock Waves 45 ( 4 ) 442 - 435 2009.04

Combustion Mechanism of Tetra-Olglycidyl Azide Polymer and Its Application to Hyprid Rocket Reviewed

Wada,Y.,Seike,Y.,Nishioka,M.,Tsuboi,N.,Shimada,T.,Hasegawa,K.,Kobayashi,K.,Hori,K.

Advancements in Energetic Materials and Chemical Propulsion 1099 - 1114 2009.04

Combustion Characteristics of HAN-Based Liquid Monopropellant Reviewed

Katsumi,T. Kodama,H.,Shibamoto,H.,Nakatsuka,J.,Hasegawa,K.,Kobayashi,K.,Ogawa,H.,Tsuboi,N.,Sawai,S.,Hori,K.

Advancements in Energetic Materials and Chemical Propulsion 125 - 139 2009.04

Combustion Characteristics of HAN-Based Liquid Monopropellant Reviewed

Katsumi,T. Kodama,H.,Ogawa,H.,Tsuboi,N.,Sawai,S.,Hori,K.

Science and Technology of Energetic Materials 70 ( 2 ) 27 - 32 2009.04

Numerical Simulation of Single Spinning and Two-Headed Detonation in a Circular Tube Reviewed

Tsuboi,N.,Daimon,Y.,Hayashi,A.K

Advancements in Energetic Materials and Chemical Propulsion 1076 - 1084 2009.04

Combustion mechanism of tetra-ol glycidyl azide polymer Reviewed

Wada,Y.,Seike,Y.,Tsuboi,N.,Hasegawa,K.,Kobayashi,K.,Nishioka,N.,Keiichi Hori

Science and Technology of Energetic Materials 69 ( 5 ) 143 - 147 2009.04

The Determination of the Third Body Efficiencies for the H+O2+M=HO2+M reaction (M=Ar, H2O) Reviewed

Morii,Y.,Tsuboi,N.,Koshi,M.,Ogawa,H.,Hayashi,A.K.,Shimizu,T.

Science and Technology of Energetic Materials 70 ( 5 ) 117 - 121 2009.04

Numerical Study on Propagation of Spherical Detonation Reviewed

Asahara,M.,Tsuboi,N.,Hayashi,A.K.,Yamada,E.

Science and Technology of Energetic Materials 70 ( 2 ) 49 - 52 2009.04

Numerical Simulation of H2/Air Detonation Using Unstructured Mesh Reviewed

Togashi,F.,Löhner,R.,Tsuboi,N.

Shock Waves 19 ( 2 ) 151 - 162 2009.04

Energy Release Effect of Mixture on Single Spinning Detonation Structure Reviewed

Tsuboi,N.,Hayashi,A.K.,Koshi,M.

Proceedings of the Combustion Institute 32 2405 - 2412 2009.04

A Numerical Analysis of the Auto-Ignition of a High Pressure Hydrogen Jet Provided by a Thin Tube Reviewed

Yamada,E.,Watanabe,S.,Hayashi,A.K.,Tsuboi,N.

Proceedings of the Combustion Institute 32 2363 - 2369 2009.04

Spinning Detonation and Velocity Deficit in Small Diameter Tubes Reviewed

Kitano,S.,Fukao,M.,Susa,A.,Tsuboi,N.,Hayashi1,A.K.,Koshi,M.

Proceedings of the Combustion Institute 32 2355 - 2362 2009.04

Combustion Model of Tetra-ol Glycidyl Azide Polymer Reviewed

Wada,Y.,Tsuboi,N.,Hori,K.,et al.

Proceedings of the Combustion Institute 32 2005 - 2012 2009.04

Numerical Simulation of JP10/Air Two-Phase Detonation Reviewed

Masuda,N.,Tangirala,V.,Benkiewicz,K.,Hayashi,A.K.,Tsuboi,N.

Advancements in Energetic Materials and Chemical Propulsion 423 - 438 2009.04

A Modeling of Thermal Properties of Hydrogen/Oxygen System Using Molecular Simulations Reviewed

S.Tsuda,N.Yamanishi,T. Tokumasu,N.Tsuboi,Y.Matsumoto

AIAA 2009-1601, 47th AIAA Aerospace Sciences Meeting 2009.04

Thresholds of Detonation Limit in H2/O2 Rotating Detonation Engine Reviewed

Takayuki Yamada,A. Koichi Hayashi,Eisuke Yamada,Nobuyuki Tsuboi,and Venkat E. Tangirala

22nd International Colloquium on the Dynamics of Explosions and Reactive Systems, Oral 156 (2009) 2009.04

Numerical Analysis on the Correlation between Transverse Wave Strength and Detonation Velocity Reviewed

Kuninori Togai,Nobuyuki Tsuboi,A. Koichi Hayashi1,Eisuke Yamada

22nd International Colloquium on the Dynamics of Explosions and Reactive Systems, Oral 189 (2009) 2009.04

Numerical Simulation on Two-Dimensional Detonation with Boundary Layer Reviewed

Nobuyuki Tsuboi,A.Koichi Hayashi Mitsuo Koshi

22nd International Colloquium on the Dynamics of Explosions and Reactive Systems, Oral 145 (2009) 2009.04

Reduced Chemical Reaction Modelof Methane/Oxygen Mixture Reviewed

Youhi Morii,Nobuyuki Tsuboi,Mitsuo Koshi,Hiroyuki Ogawa,A.Koichi Hayashi,Taro Shimizu

22nd International Colloquium on the Dynamics of Explosions and Reactive Systems, Poster 148 (2009) 2009.04

Numerical study on auto-ignition of a high pressure hydrogen jet in a tube having a gap Reviewed

Naoki Kitabayashi,Eisuke Yamada,A. Koichi Hayashi,Nobuyuki Tsuboi

22nd International Colloquium on the Dynamics of Explosions and Reactive Systems, Oral 154 (2009) 2009.04

Numerical Study on Propagating Process of H2/O2 Cylindrical Detonation with Detailed Reaction Model Reviewed

Makoto Asahara,Nobuyuki Tsuboi,A. Koichi Hayashi,Eisuke Yamada

22nd International Colloquium on the Dynamics of Explosions and Reactive Systems, Poster 161 (2009) 2009.04

Numerical Study on the Heat Transfer of the Flow With Endothermic Chemical Reaction Reviewed

K. Fukiba,N. Tsuboi,R. Minato

45th AIAA/ASME/SAE/ASEE Joint Propulsion ConferenceAIAA-2009-5461m 2009 2009.04

A Noble Kinetic Model of H2/O2 System Applicable to Liquid Rocket Engine Combustion Reviewed

K. Shimizu,H.Hibi,M. Koshi,Y. Morii,N.Tsuboi

45th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, AIAA-2009-4968, 2009 2009.04

Mechanism of High Pressure Hydrogen Auto-ignition When Spouting into Air Reviewed

E. Yamada,N. Kitabayashi,A.K. Hayashi,N. Tsuboi

International Conference on Hydrogen Safety (ICHS3), Ajaccio, France, September 2009 2009.04

Sensitivity Analysis of Rotating Detonation Engine with a Detailed Reaction Model Reviewed

A.K.Hayashi,Y.Kimura,T.Yamada,E.Yamada,J.Kindracki,E.Dzieminska,P. Wolanski,N.Tsuboi,V.E. Tangirala,T.Fujiwara

AIAA 2009-0633, 47th AIAA Aerospace Sciences Meeting 2009.01

Effects of Chemical Reaction Model on H2/O2 Detonation at High Pressures Reviewed

S.Adachi,A.K.Hayashi,Y. Morii,N.Tsuboi,E.Yamada

AIAA 2009-0441, 47th AIAA Aerospace Sciences Meeting 2009.01

Numerical Study and Performance Prediction for Gaseous Hydrogen/Oxygen Bell Nozzle Reviewed

Tsuboi,N.,Ito,T.,Miyajima,H.

Transactions of the Japan Society for Aeronautical and Space Sciences 51 ( 172 ) 86 - 92 2008.04

Effects of Initial Pressure on Single Spinning Detonation in a Square Tube Reviewed

Tsuboi N.,Asahara,M.,Hayashi,A.K.

Science and Technology of Energetic Materials 69 ( 5 ) 173 - 176 2008.04

気球を利用した無重力実験のための機体開発とそのフライト結果 Reviewed

澤井秀次郎,橋本樹明,坂井真一郎,坂東信尚,小林弘明,藤田和央,吉光徹雄,石川毅彦,稲富裕光,福家英之,鎌田幸男,星野慎二,田島賢一,門岡昇平,上原聡,小島孝之,上野誠也,宮路幸二,坪井伸幸,平木講儒,鈴木宏二郎,松嶋清穂,中田孝

日本航空宇宙学会論文集 56 ( 654 ) 339 - 346 2008.04

フィルム冷却を考慮した液酸/液水ロケットエンジン性能解析 Reviewed

伊藤隆，坪井伸幸，宮島博

日本航空宇宙学会論文集 56 ( 659 ) 551 - 557 2008.04

Numerical Simulation of Spinning Detonation in Square Tube Reviewed

Tsuboi,N.,Asahara,M.,Eto,K.,Hayashi,A.K.

Shock Waves 18 ( 4 ) 329 - 344 2008.04

Three-dimensional Numerical Simulation of Detonations in Coaxial Tubes Reviewed

Tsuboi,N.,Daimon,Y.,Hayashi,A.K.

Shock Waves 18 379 - 392 2008.04

Internal and External Flow of Rocket Nozzle Reviewed

Shimizu,T.,Kodera,M.,Tsuboi,N.

Journal of the Earth Simulator 9 ( 3 ) 19 - 26 2008.04

Visualization of the Heat Flux Distribution on a Blunt-nosed body with an Aerospike in Hypersonic Flow Reviewed

S.Ha,H. Nagai,K.Asai,K.Nakakita,N.Tsuboi

2008 KSAS-JSASS Joint International Symposium on Aerospace Engineering 333 - 339 2008.04

Nonequilibrium Rotational Temperature Measurements over Flat Plate in Hypersonic Rarefied Gas Flow Reviewed

N.Tsuboi,Y.Matsumoto

26th International Symposium on Rarefied Gas Dynamics 545 - 550 2008.04

Fundamental Study on Pressure Oscillation in a Liquid Rocket Engine Combustion Chamber Reviewed

Shimizu,T.,Mizobuchi,Y.,Tsuboi,N.

44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, AIAA 2008-4548 2008.04

Aerodynamic Design of Balloon- Based Operation Vehicle for Precooled Turbojet Engine Demonstration Reviewed

K. Fujita,N. Tsuboi,S. Sawai,H. Kobayashi,K. Miyaji,T. Uchiyama

AIAA-2008-2658, 15th AIAA International Space Planes and Hypersonic Systems and Technologies Conference 2008.04

3次元爆轟現象の数値解析

坪井伸幸，林光一

ながれ ( 日本流体力学会 ) 26 ( 3 ) 183 - 192 2007.07

3次元爆轟現象の数値解析 Reviewed

坪井伸幸,林光一

日本流体力学会誌「ながれ」 26 183 - 192 2007.04

Detailed Structure of Spinning Detonation in a Circular Tube Reviewed

Tsuboi,N.,Eto,K.,Hayashi,A.K.

Combustion and Flame 149 ( 1/2 ) 144 - 161 2007.04

Mass Transfer around a Cold Cylinder with Condensation of Vapor (1st Report)-Mass Flux Decrease due to Condensation of Vapor at Surface Temperatures from 200 to 250 K- Reviewed

Fukiba,K.,Sato,T.,Tsuboi,N.,Kobayashi,H.

Transactions of the Japan Society for Aeronautical and Space Sciences 50 ( 169 ) 151 - 159 2007.04

Numerical Study on Spinning Detonations Reviewed

Tsuboi,N.,Hayashi,A.K.

Proceedings of the Combustion Institute 31 1289 - 1296 2007.04

酸水素反応を伴うベル型ノズルの数値解析および性能評価 Reviewed

坪井伸幸,伊藤隆,宮島博

日本航空宇宙学会論文集 54 ( 633 ) 441 - 447 2006.04

Interaction between Shock Wave and Boundary Layer in Nonequilibrium Hypersonic Rarefied Flow (5th Report, Nonequilibrium of Rotational Temperature in Flow over Flat Plate) Reviewed

Tsuboi,N.,Matsumoto,Y.

JSME International Journal 49 ( 3 ) 771 - 779 2006.04

Precooled Turbojet Engine Flight Experiment Using Balloon-Based Operation Vehicle Reviewed

Fujita,K.,Sawai,S.,Kobayashi,H.,Tsuboi,N.,Taguchi,H. ,Kojima,T.,Okai,K.,Sato,T.,Miyaji,K

Acta Astronautica 59 ( 1-5 ) 263 - 270 2006.04

デトネーション駆動型衝撃風洞を用いたスクラムジェット燃焼器モデル内の燃焼過程 Reviewed

小原哲郎,伊藤豪明,金泰煥,大八木重治,坪井伸幸

日本機械学会論文集B編 72 ( 718 ) 1596 - 1604 2006.04

冷却円柱周りの水蒸気の凝縮を含む流れの物質伝達（第２報）表面温度120250Kにおけるミストの付着を伴う物質伝達 Reviewed

吹場活佳,佐藤哲也,坪井伸幸,小林弘明

日本航空宇宙学会誌論文集 54 ( 629 ) 257 - 265 2006.04

Numerical Simulation on Hydrogen Fuel Jetting from High Pressure Tank Reviewed

Yun-Feng LIU,Hiroyuki SATO,Nobuyuki TSUBOI,Fumio HIGASHINO,A. Koichi HAYASHI

Science and Technology of Energetic Materials 67 ( 1 ) 7 - 11 2006.04

Three-dimensional Chapman-Jouguet Detonation in a Rectangular Tube Effect of Cross-section Area- Reviewed

Tsuboi,N.,Eto,K.,Hayashi,A.K

Pulse and Continuous Detonation Propulsion 61 - 68 2006.04

Experimental and Numerical Study on Shock Wave-Boundary Layer Interactions in Hypersonic Rarefied Gas Flow over a Flat Plate with Sharp Leading Edge Reviewed

Tsuboi,N.,Matsumoto,Y

AIAA Journal 43 ( 6 ) 1243 - 1255 2005.06

冷却円柱周りの水蒸気の凝縮を含む流れの物質伝達（第１報）表面温度200250Kにおける水蒸気の凝縮による質量流束の低下 Reviewed

吹場活佳,佐藤哲也,坪井伸幸,小林弘明

日本航空宇宙学会誌論文集 53 577 - 585 2005.04

Numerical Study on Three-Dimensional C-J Detonation Waves:Detailed Propagating Mechanism and Existence of OH Radical Reviewed

Eto,K.,Tsuboi,N.,Hayashi,A.K.

Proceedings of the Combustion Institute 30, The Combustion Institute 30 1907 - 1913 2005.04

希薄領域における極超音速非平衡流中の衝撃波と境界層干渉（第5報、平板上の非平衡な回転温度の計測とその評価） Reviewed

坪井伸幸,松本洋一郎

日本機械学会論文集Ｂ編 71 ( 702 ) 46 - 53 2005.04

希薄領域における極超音速非平衡流中の衝撃波と境界層干渉（第４報、希薄風洞用ノズルの設計） Reviewed

坪井伸幸，松本洋一郎

日本機械学会論文集Ｂ編 71 ( 706 ) 1579 - 1587 2005.04

Experimental and Numerical Studies on Detonation Wave Propagating in a Rectangular Tube with Obstacles Reviewed

Sato,H.,Tsuboi,N.,Hayashi,A.K.,Lee,JHS

Science and Technology of Energetic Materials 65 ( 5 ) 155 - 160 2004.09

Three-Dimensional Direct Simulation Monte Carlo Method of Hypersonic Rarefied Gas Flow around a Sharlp Flat Plate Reviewed

Tsuboi,N.,Yamaguchi,H.,Matsumoto,Y.

Journal of Spacecraft and Rockets 41 ( 3 ) 397 - 405 2004.04

Experimental and Numerical Estimation of Pulse Detonation Engine Performance Reviewed

Tsuboi,N.,Fujii,K,Kenmoku,Y.,Hayashi,A.K.

Confined Detonation and Pulse Detonation Engines 249 - 260 2003.04

Visualization of Jet Flows over a Plate by Pressure Sensitive Paint Experiments and Comparison with CFD Reviewed

Fujii,K.,Tsuboi,N.,Fujimatsu,N.

Visualization and Imaging Transport Phenomena, Annuals of the New York Academy of Sciences 972 265 - 270 2002.10

希薄領域における極超音速非平衡流中の衝撃派/境界層干渉　(第2報、並進/回転エネルギーの微視的状態の比較) Reviewed

坪井伸幸,山口浩樹,松本洋一郎

日本機会学会論文集B編 68 ( 670 ) 1653 - 1660 2002.04

希薄領域における極超音速非平衡流中の衝撃派/境界層干渉　(第3報、面分子干渉モデルの影響) Reviewed

坪井伸幸,松本洋一郎

日本機会学会論文集B編 68 ( 670 ) 1661 - 1668 2002.04

Three-Dimensional Numerical Simulation for Hydrogen/Air Detonation : Rectangular and Diagonal Structures Reviewed

Tsuboi,N.,Katoh,S.,Hayashi A.K.

Proceedings of the Combustion Institute, The Combustion Institute 29 2783 - 2788 2002.04

三次元デトネーションの数値解析 Reviewed

林光一,加藤誠司,坪井伸幸

プラズマ応用科学，プラズマ応用科学会 9 149 - 153 2001.04

Structure of Cornstarch-Oxygen Two-Phase Detonation in a Circular Tube Reviewed

Tsuboi,N.,Hayashi,A.K.,Matsumoto,Y.

Chemical Physics Reports(The Journal of the Russian academy of Sciences) 20 ( 6 ) 56 - 66 2001.04

Three-Dimensional Structure of Cornstarch-Oxygen Two-Phase Detonation in a Circular Tube Reviewed

Tsuboi,N.,Hayashi,A.K.,Matsumoto,Y.

Aachivum Combustionis 21 ( 2 ) 101 - 116 2001.04

Multi-Scale Analysis of Non-Equilibrium Hypersonic Rarefied Gas Flow Reviewed

Matsumoto,Y.,Tsuboi,N.,Tokumasu,T. ,Yamanishi,N.

Computational Fluid Dynamics Journal 9 ( 1-Ⅰ ) 459 - 470 2001.01

Three-dimensional Parallel Simulation of Cornstarch-Oxygen Two-Phase Detonation Reviewed

Tsuboi,N.,Hayashi,A.K.,Matsumoto,Y.

Shock Waves 10 ( 4 ) 277 - 285 2000.04

希薄領域における極超音速非平衡流中の衝撃波/境界層干渉(第1報.連続体モデル及びLarsen-Borgnakkeモデルとの比較) Reviewed

坪井伸幸,山口浩樹,松本洋一郎

日本機械学会論文集(B編) 66 ( 646 ) 1377 - 1386 2000.04

Non-Equilibrium Hypersonic Diatomic Molecular Flow Simulation by DSMC Method Reviewed

Matsumoto,Y.,Tsuboi,N.,Tokumasu,T.,Yamanishi,N.

Modeling and Simulation based Engineering 1 893 - 898 1998.04

平板に衝突する超音速噴流に関する数値解析及び実験 Reviewed

坪井伸幸,林光一,藤原俊隆,嵐和夫,児玉優

日本航空宇宙学会誌 46 ( 536 ) 485 - 496 1998.04

Numerical Simulation of a Supersonic Jet Impingement on a Ground Reviewed

Tsuboi,N.,Hayashi,A.K.,Fujiwara,T.,Arashi,K.,Kodama,Y.

SAE 1991 Transactions, Journal of Aerospace Section 1 2 2168 - 2180 1991.04

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