Numerical Analysis of Combustion around a Strut in Supersonic Airflow
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概要
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Numerical simulation of combustion around a strut in supersonic airflow at Mach 1.5 was conducted. In previous papers, experimental results on flame-holding characteristics have been shown for the strut divided into two parts, indicating the effectiveness of the flame-holding characteristics of this strut. Stable flame-holding is due to a comparatively long residence time in the subsonic flow region between the two parts of the strut. The present study is analytical evidence of the stable flame-holding of this strut. The Stahl and Warnatz’s detailed chemistry of hydrogen/oxygen reactions and the Baldwin Lomax turbulence algebraic model were employed to simulate the chemical reaction and turbulent flow, respectively. Flame structures such as distributions of chemical species and temperature were obtained. For example, the predicted density distributions explicitly showed an attached shock wave, expansion fans and shear layers, and had good agreement with the shadowgraph of the experiment. The overall equivalence ratio in the space between two strut parts was calculated to evaluate the reaction time in the space between the struts and a particle trace analysis was performed to evaluate the residence time in the space. By obtaining the Damköhler number from two characteristic times, two flame-holding limits, namely the chemical kinetic limit at small interval between two struts and the dynamic limit at large interval, were discussed. The numerical results were qualitatively consistent with the previous experimental results.
- 社団法人 日本航空宇宙学会の論文
- 2000-11-04
著者
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JU Yiguang
Department of Mechanical and Aerospace Engineering, Princeton University
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Minato R
Muroran Inst. Technol. Muroran Jpn
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Ju Yiguang
Department Of Aeronautics And Space Engineering Tohoku University
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NIIOKA Takashi
Institute of Fluid Science, Tohoku University
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Niioka Takashi
Institute Of Fluid Science Tohoku University
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MINATO Ryojiro
Subaru Research Center
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