Faculty Profiles - TSUBOI Nobuyuki

Papers - TSUBOI Nobuyuki

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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.)

<p>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.</p>

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.)

<p>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.</p>

DOI： 10.1299/jsmekyushu.2019.72.D12

CiNii Article

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

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Papers - TSUBOI Nobuyuki