Search Results - "KOICHI HAYASHI, A"

Self-ignition and flame propagation of high-pressure hydrogen jet during sudden discharge from a pipe by Mogi, Toshio, Wada, Yuji, Ogata, Yuji, Koichi Hayashi, A.

“…Hydrogen is expected to serve as a clean energy carrier. However, since there are serious ignition hazards associated with its use, it is necessary to collect…”
Get full text

Three-dimensional numerical thrust performance analysis of hydrogen fuel mixture rotating detonation engine with aerospike nozzle by Jourdaine, Nicolas, Tsuboi, Nobuyuki, Ozawa, Kohei, Kojima, Takayuki, Koichi Hayashi, A.

“…The propulsive performance for an H2/O2 and H2/Air rotating detonation engine (RDE) with conic aerospike nozzle has been estimated using three-dimensional…”
Get full text

Numerical study on spinning detonations by Tsuboi, Nobuyuki, Koichi Hayashi, A.

“…Spinning detonations in both a circular tube and a square tube are presented in order to reveal characteristics of spinning modes by using three-dimensional…”
Get full text

Numerical study on unsteady characteristics of high-pressure hydrogen jet ejected from a pinhole by Asahara, Makoto, Iwasa, Toshihiro, Tsuboi, Nobuyuki, Hayashi, A. Koichi

“…The aim of this study was to delineate the unsteady fluid dynamics of the high-pressure hydrogen jet to clarify the relationship between the forced ignition…”
Get full text

Auto-ignition and DDT driven by shock wave – Boundary layer interaction in oxyhydrogen mixture by Dziemińska, Edyta, Hayashi, A. Koichi

“…Detonation research started just at the beginning of 1880s, but its generation mechanism is still a mystery and has not been explained in details yet. Many…”
Get full text

Numerical estimation of the thrust performance on a rotating detonation engine for a hydrogen–oxygen mixture by Tsuboi, Nobuyuki, Watanabe, Yusuke, Kojima, Takayuki, Hayashi, A. Koichi

“…The numerical simulations of 2D and 3D rotating detonation engines for a hydrogen–oxygen mixture are performed using a detailed chemistry model. The comparison…”
Get full text

Two-dimensional numerical simulation on galloping detonation in a narrow channel by Tsuboi, Nobuyuki, Morii, Youhi, Koichi Hayashi, A.

“…The numerical simulations of the two-dimensional galloping detonation performed by using two-dimensional full Navier–Stokes simulations with a detailed…”
Get full text

Numerical simulation of auto-ignition induced by high-pressure hydrogen release with detailed reaction model: Fluid dynamic effect by diaphragm shape and boundary layer by ASAHARA, Makoto, YOKOYAMA, Akinori, KOICHI HAYASHI, A, YAMADA, Eisuke, TSUBOI, Nobuyuki

“…The effects of the diaphragm shape and boundary layer near walls on auto-ignition induced by high-pressure hydrogen release in a real size tube are numerically…”
Get full text

Mechanism of high-pressure hydrogen auto-ignition when spouting into air by Yamada, Eisuke, Kitabayashi, Naoki, Hayashi, A. Koichi, Tsuboi, Nobuyuki

“…High-pressure hydrogen leak is one of the top safety issues presently. This study elucidates numerically the physics and mechanism of high-pressure hydrogen…”
Get full text

Numerical simulation of spinning detonation in square tube by Tsuboi, Nobuyuki, Asahara, Makoto, Eto, Keitaro, Hayashi, A. Koichi

“…A single spinning detonation wave propagating in a square tube is simulated three-dimensionally with the detailed chemical reaction mechanism for hydrogen/air…”
Get full text

Flame Propagation in a Narrow Closed Channel: Effects of Aspect Ratios, Blockage Ratio, and Mixture Reactivity on Flame Speed and Pressure Dynamics by Escofet-Martin, David, Chien, Yu-Chien, Dunn-Rankin, Derek, Dzieminska, Edyta, Hayashi, A. Koichi, Hanada, Shota

“…A set of experiments is conducted to study flame acceleration in a narrow rectangular cross-section channel in order to examine the effects of mixture…”
Get full text

Three-Dimensional Simulation of Deflagration-to-Detonation Transition with a Detailed Chemical Reaction Model by Machida, Takuya, Asahara, Makoto, Hayashi, A. Koichi, Tsuboi, Nobuyuki

“…A three-dimensional simulation of the deflagration-to-detonation transition (DDT) in a H 2 /O 2 mixture in a rectangular tube is performed under adiabatic and…”
Get full text

Three-Dimensional Numerical Simulation of a Rotating Detonation Engine: Effects of the Throat of a Converging-Diverging Nozzle on Engine Performance by Eto, Seiichiro, Tsuboi, Nobuyuki, Kojima, Takayuki, Hayashi, A. Koichi

“…The effect of a converging-diverging nozzle on the performance of a rotating detonation engine was estimated using three-dimensional numerical simulations with…”
Get full text

Coupling Problem Between Solid Tube and Shock Wave/Detonation Wave by Wakabayashi, Ryo, Goto, Yusuke, Yamada, Eisuke, Asahara, Makoto, Hayashi, A. Koichi

“…A detonation is a combustion wave that propagates in an inflammable medium at supersonic speeds. This phenomenon is important in the fields of supersonic…”
Get full text

Numerical analysis on auto-ignition of a high pressure hydrogen jet spouting from a tube by Yamada, Eisuke, Watanabe, Satoru, Hayashi, A. Koichi, Tsuboi, Nobuyuki

“…In this study, a direct numerical simulation based on compressible flow dynamics has been applied to the autoignition and extinction of a high-pressure…”
Get full text

Generation and Dynamics of Sub-Transverse Wave of Cylindrical Detonation by Asahara, Makoto, Hayashi, A. Koichi, Yamada, Eisuke, Tsuboi, Nobuyuki

“…This article shows a numerical simulation of the transverse cell in a H 2 /O 2 diverging cylindrical detonation. An advection upstream splitting method with a…”
Get full text

Implementation of a Robust Weighted Compact Nonlinear Scheme for Modeling of Hydrogen/Air Detonation by Iida, Ryohei, Asahara, Makoto, Hayashi, A. Koichi, Tsuboi, Nobuyuki, Nonomura, Taku

“…In order to simulate detonation, a high-order shock-capturing scheme that models chemical reactions is implemented, and its resolution is examined by testing…”
Get full text

Dynamic behavior of a freely-propagating turbulent premixed flame under global stretch rate oscillations by Tachibana, Shigeru, Yamashita, Junpei, Zimmer, Laurent, Suzuki, Kazuo, Hayashi, A. Koichi

“…Dynamic features of a freely propagating turbulent premixed flame under global stretch rate oscillations were investigated by utilizing a jet-type low-swirl…”
Get full text

Energy release effect of mixture on single spinning detonation structure by Tsuboi, Nobuyuki, Hayashi, A. Koichi, Koshi, Mitsuo

“…Unsteady three-dimensional numerical simulation on a single spinning detonation in a circular tube are presented in order to understand the effects of energy…”
Get full text

Limits of classical molecular simulation on the estimation of thermodynamic properties of cryogenic hydrogen by Nagashima, Hiroki, Tokumasu, Takashi, Tsuda, Shin-ichi, Tsuboi, Nobuyuki, Koshi, Mitsuo, Hayashi, A. Koichi

“…In this study, we investigated the limits of classical molecular simulation on the estimation of thermodynamic properties of cryogenic hydrogen. Three…”
Get full text