Faculty Profiles - TSUBOI Nobuyuki

Papers - TSUBOI Nobuyuki

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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)

<p>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.</p>

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.)

<p>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.</p>

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

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Papers - TSUBOI Nobuyuki