Investigation on secondary-flows of a supersonic flat-plate boundary layer induced by isentropic sidewall compression

被引：0
|
作者：
He G. [1 ]
Zhao Y.-X. [1 ]
Zhou J. [1 ]
机构：
[1] Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha
来源：
| 1624年 / Journal of Propulsion Technology卷 / 37期
关键词：
Boundary layer; Inlet; Secondary-flow; Small perturbation approach; Streamwise vortex;
D O I：
10.13675/j.cnki.tjjs.2016.09.004
中图分类号：
学科分类号：
摘要：
In order to investigate the mechanics of the formation of the secondary flows induced by the isentropic sidewall compression in the supersonic flat-plate boundary layers, a simplified flow model was proposed. Based on the small perturbation approach and numerical study, the nonuniformity of Mach number distribution of the inflow was investigated to illustrate its importance for the formation of the secondary flows. The results show that, the secondary flows induced by the sidewall compression are the characteristics of the mean flow-field and independent of the instantaneous interaction between the disturbances and the vortexes. Due to the different characteristics of propagation of compression waves in the main stream and the boundary layer, the flows are compressed non-uniformly by the sidewall, resulting in the cross-movement of the fluid in the boundary layer compared to that in the mainstream. The distinction of direction between density gradient and pressure gradient or barocliny is one of the important factors leading to the formation and development of the streamwise vortex. © 2016, Editorial Department of Journal of Propulsion Technology. All right reserved.
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页码：1624 / 1630
页数：6
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