JAXA Repository / AIREX 未来へ続く、宙(そら)への英知
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Other TitleLES of Jet Turbulent Mixing in Supersonic Flow
Author(jpn)渡部, 潤也; 河内, 俊憲; 滝田, 謙一; 升谷, 五郎
Author(eng)Watanabe, Junya; Kouchi, Toshinori; Takita, Kenichi; Masuya, Goro
Author Affiliation(jpn)東北大学; 東北大学; 東北大学; 東北大学
Author Affiliation(eng)Tohoku University; Tohoku University; Tohoku University; Tohoku University
Issue Date2011-02-28
PublisherJapan Aerospace Exploration Agency (JAXA)
Publication titleJAXA special publication: Proceedings of 42nd Fluid Dynamics Conference / Aerospace Numerical Simulation Symposium 2010
宇宙航空研究開発機構特別資料: 第42回流体力学講演会/航空宇宙数値シミュレーション技術シンポジウム2010 論文集
Publication date2011-02-28
AbstractThe large-eddy simulation (LES) of a jet transversely injected into a supersonic crossflow was conducted to investigate the large-scale vortex structure around the jet and the turbulent mixing state. The injectant concentration obtained by LES was compared with acetone planer laser-induced fluorescence (PLIF) data. Numerical results reproduced the injectant mixing field not only in the averaged distribution but also in the turbulent features. Statistical analysis based on LES data evaluated the extent of the injectant turbulent diffusion flux and the injectant mean convective flux in a near-field cross-sectional plane: the mean convection of the injectant by counter-rotating vortex pair was larger than the turbulent diffusion except in the windward mixing layer between jet and crossflow. The vortex structure was visualized by the iso-surfaces of second invariant of the velocity gradient tensor. In the windward mixing layer, large-scale vortices randomly originated and extended mainly toward the downstream direction around the jet trajectory, meandering in the spanwise and wall-normal directions. These vortices deeply penetrate into the crossflow and contribute to the enhanced mixing by entraining a large amount of crossflow air in the near-field. Three-dimensional jet projection was produced by the windward large-scale vortex which has streamwise counter-rotating vortex pair.
DescriptionOriginal contains color illustrations
Meeting Information: 42nd Fluid Dynamics Conference / Aerospace Numerical Simulation Symposium 2010 (June 24-25, 2010. Yonago Convention Center BiG SHiP), Yonago, Tottori Japan
形態: カラー図版あり
会議情報: 第42回流体力学講演会/航空宇宙数値シミュレーション技術シンポジウム2010 (2010年6月24日-25日. 米子コンベンションセンター BiG SHiP)
Document TypeConference Paper
JAXA Category特別資料
Report NoJAXA-SP-10-012

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