Faculty Profiles - TSUBOI Nobuyuki

Papers - TSUBOI Nobuyuki

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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

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Papers - TSUBOI Nobuyuki