Hybrid Reynolds-averaged Navier-Stokes/large-eddy simulation of jet mixing in a supersonic crossflow  

作　　者：WANG HongBo WANG ZhenGuo SUN MingBo QIN Ning 

机构地区：[1]Science and Technology on Scramjet Laboratory,National University of Defense Technology [2]Department of Mechanical Engineering,University of Sheffield

出　　处：《Science China(Technological Sciences)》2013年第6期1435-1448,共14页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 50906098 and 91016028);Fok Ying Tung Education Foundation (Grant No. 131055)

摘　　要：A sonic under-expanded transverse jet injection into a Ma 1.6 supersonic crossflow is investigated numerically using our hybrid RANS/LES (Reynolds-averaged Navier-Stokes/large eddy simulation) method. First, a calculation is carried out to validate the code, where both the instantaneous and statistical results show good agreement with the existing experimental data. Then the jet-mixing characteristics are analyzed. It is observed that the large-scale vortex on the windward portion of the jet boundary is formed mainly by the intermittent impingement of the incoming high-speed fluid on the relatively low-speed region of the upstream jet boundary, where the interaction between the upstream separated region and the jet supplies a favorable pressure condition for the sustaining acceleration of the high-speed fluid during the vortex forming, associated with which the incoming fluid is entrained into the jet boundary and large-scale mixing occurs. Meanwhile, the secondary recirculation zone between the upstream separated region and the jet is observed to develop evidently during the vortex forming, inducing the entrainment of jet fluid into the upstream separated region. Moreover, effects of the incoming boundary layer on the jet mixing are addressed.

关 键 词：hybrid RANS/LES （Reynolds-averaged Navier-Stokes/large eddy simulation） jet mixing SUPERSONIC boundary layer 

分 类 号：TK401[动力工程及工程热物理—动力机械及工程]