JAXA Special Publication: Proceedings of 42nd Fluid Dynamics Conference / Aerospace Numerical Simulation Symposium 2010
巻
JAXA-SP-10-012
発行年
2011-02-28
会議概要（会議名, 開催地, 会期, 主催者等）
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)
会議概要（会議名, 開催地, 会期, 主催者等）（英）
42nd Fluid Dynamics Conference / Aerospace Numerical Simulation Symposium 2010 (June 24-25, 2010. Yonago Convention Center BiG SHiP), Yonago, Tottori Japan
抄録（英）
The 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.
内容記述
形態: カラー図版あり
内容記述（英）
Physical characteristics: Original contains color illustrations
超音速流中における噴流の乱流混合のLES解析
64967026.pdf
(1.33MB)
