Effects of the injector geometry on a sonic jet into a supersonic crossflow  

作　　者：WANG GuoLei CHEN LiWei LU XiYun 

机构地区：[1]Department of Modern Mechanics,University of Science and Technology of China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2013年第2期366-377,共12页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11132010 and 11072236)

摘　　要：Large-eddy simulation of a sonic injection from circular and elliptic injectors into a supersonic crossflow has been performed.The effects of injector geometry on various fundamental mechanisms dictating the intricate flow phenomena including shock/jet interaction,jet shear layer vortices and their evolution,jet penetration properties and the relevant turbulence behaviors have been studied systematically.As a jet issuing transversely into a supersonic crossflow,salient three-dimensional shock and vortical structures,such as bow,separation and barrel shocks,Mach disk,horseshoe vortex,jet shear layer vortices and vortex pairs,are induced.The shock structures exhibit considerable deformations in the circular injection,while their fluctuation becomes smaller in the elliptic injection.The jet shear layer vortices are generated at the jet periphery and their evolution characteristics are analyzed through tracing the centroid of these coherent structures.It is found that the jet from the elliptic injector spreads rapidly in the spanwise direction but suffers a reduction in the transverse penetration compared to the circular injection case.The turbulent fluctuations are amplified because of the jet/crossflow interaction.The vertical Reynolds normal stress is enhanced in the downstream of the jet because of the upwash velocity induced by the counter-rotating vortex pair.Large-eddy simulation of a sonic injection from circular and elliptic injectors into a supersonic crossflow has been performed. The effects of injector geometry on various fundamental mechanisms dictating the intricate flow phenomena including shock/jet interaction, jet shear layer vortices and their evolution, jet penetration properties and the relevant turbulence behaviors have been studied systematically. As a jet issuing transversely into a supersonic crossflow, salient three-dimensional shock and vortical structures, such as bow, separation and barrel shocks, Mach disk, horseshoe vortex, jet shear layer vortices and vortex pairs, are induced. The shock structures exhibit considerable deformations in the circular injection, while their fluctuation becomes smaller in the elliptic injection. The jet shear layer vortices are generated at the jet periphery and their evolution characteristics are analyzed through tracing the centroid of these coherent structures. It is found that the jet from the elliptic injector spreads rapidly in the spanwise direction but suffers a reduction in the transverse penetration compared to the circular injection case. The turbulent fluctuations are amplified because of the jet/crossflow interaction. The vertical Reynolds normal stress is enhanced in the downstream of the jet because of the upwash velocity induced by the counter-rotating vortex pair.

关 键 词：large-eddy simulation compressible turbulence supersonic flow JET shock wave shock and turbulence interaction 

分 类 号：O358[理学—流体力学]