研究者詳細 - 坪井　伸幸

口頭発表・ポスター発表等 - 坪井　伸幸

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Numerical study of cryogenic coaxial jet under supercritical condition

Muto D., Tsuboiy N., Terashimaz H.

52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014

開催期間： 2014年01月01日記述言語：英語

Effects of recess on the mixing of the cryogenic coaxial jet under supercritical conditions were numerically investigated. Recessed injectors have been applied as coaxial injectors of liquid rocket engines because it is expected to improve propellant mixing and combustion efficiency. In the present study, a numerical simulation code was developed to examine jet mixing under the supercritical pressures. For validation of the present method, a two-dimensional planner jet simulation was carried out. The present result showed good agreement with an experimental result. As a preliminary study of coaxial jets, co-planner simulations were performed in a recessed case and an unrecessed case. Large-scale vortical structures were observed in the both cases, and the recessed case showed the larger struc- tures relative to the unrecessed case. This is because of the destabilization mechanism of a recessed region. These instabilities improved entrainments of ambient uid, and as a result, the enhanced jet mixing shortens the jet-core length.

Numerical Study of Cryogenic Coaxial Jet under Supercritical Condition

D. Muto, N. Tsuboi, H. Terashima

AIAA SCITECH2014

Numerical Simulation on Unsteady Compressible Low-Speed Flow Using Preconditioning Method: Preconditioning Method Including Multi-Species Mass Conservation Equations

Nobuyuki Tsuboi

Tenth International Conference on Flow Dynamics

Detailed Investigation on the Wave Structures in Ethylene/Oxygen Detonations in Narrow Channels

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

9th International High Energy Materials

Numerical Analysis of Spinning Detonation Dependency on Initial Pressure Using AUSMDV Scheme

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

51th AIAA Aerospace Sciences Meeting

Three-dimensional Numerical Simulation on Unsteady Compressible Flow Using Preconditioning Method in Hybrid Rocket Engine: Effects of Preconditioning Schemes

N.Tsuboi, K.Fukiba, T.Shimada

Ninth International Conference on Flow Dynamics (ICFD2012)

極超音速流れにおける30°ランプ周りの流れ場の3次元数値解析：平板幅の影響

倉本健史，武藤大貴，坪井伸幸，永井大樹( 東北大)，浅井圭介

日本機械学会九州支部第65期総会・講演会，812, 2012.3.

メタン酸素及び水素酸素燃料を用いた狭い管内を伝播する爆轟波の二次元数値解析

森井雄飛, 坪井伸幸, 小川博之, 寺島洋史, 徳留真一郎, 林光一

平成23年度衝撃波シンポジウム，1B2-4, 2012.3

重み付きコンパクトスキームを用いた2次元デトネーションの数値解析：高解像度スキームによる流れ場の詳細構造

坪井伸幸, 朝原誠, 野々村拓, 林光一

平成23年度衝撃波シンポジウム，1B2-6, 2012.3

2次元円筒デトネーションにおけるSub TransverseWaveの発生と発達

朝原誠, 林光一, 山田英助, 坪井伸幸

平成23年度衝撃波シンポジウム，1B2-6, 2012.3.

水素/空気デトネーションにおける反応モデルの影響の評価

杉安孝幸, 森井雄飛, 坪井伸幸, 林光一

平成23年度衝撃波シンポジウム，3B2-5, 2012.3.

低Re数における前処理型非定常圧縮性流れ場解析によるNACA0012翼型の空力特性評価

村田健輔, 坪井伸幸, 吹場活佳, 嶋田徹

日本機械学会九州学生会(2012) 第43回学生員卒業研究発表講演会, 439, 2012.3

LESによる超臨界流体噴流の流体力学的挙動に関する数値解析

瀬戸口，武藤，寺島，坪井，越

日本機械学会九州学生会(2012) 第43回学生員卒業研究発表講演会, 434, 2012.3

前処理型非定常圧縮性解法による噴流構造の数値解析

武藤大貴，瀬戸口彬，寺島洋史，坪井伸幸，越光男

日本機械学会九州支部第65期総会・講演会，803, 2012.3.

数値解析を用いたエアロスパイクノズルの性能評価：圧力比の影響

成宮匡，坪井伸幸，伊藤隆

日本機械学会九州支部第65期総会・講演会，812, 2012.3.

Three-Dimensional Numerical Simulation on Unsteady Compressible Flow Using Preconditioning Method: Swirling Injector Flowfield in Hybrid Rocket Engine

Nobuyuki Tsuboi, Katsuyoshi Fukiba, Toru Shimada

Eighth International Conference on Flow Dynamics (ICFD2011),OS5-15(pp.312-313)

Lewis number effect on DDT process and detonation

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

The 4th International Symposium on Energetic Materials and their Applications, 16-B1-4, 2011.11

Numerical approach to one-dimensional CH4/O2 detonation with the reduction model DRG30

Youhi Morii, Nobuyuki Tsuboi, Hiroyuki Ogawa,Shinichiro Tokudome, and A. Koichi Hayashi

The 4th International Symposium on Energetic Materials and their Applications, 17-A1-1, 2011.11

Three-dimensional simulation on a rotating detonation engine: Three-dimensional shock structure

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

The 4th International Symposium on Energetic Materials and their Applications, 18-H-2, 2011

A Molecular Study on the Thermodynamic Properties of Cryogenic Hydrogen

Hiroki Nagashima, Takashi Tokumasu, Shinichi Tsuda, Nobuyuki Tsuboi and A. Koichi Hayashi

Seventh International Conference on Flow Dynamics, CRF-39, 2010

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口頭発表・ポスター発表等 - 坪井 伸幸

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口頭発表・ポスター発表等 - 坪井　伸幸