Control of hypersonic boundary layer instability by transverse rectangular micro-cavities

被引：0
|
作者：
Guo Q. [1 ,2 ]
Tu G. [1 ]
Chen J. [1 ,2 ]
Yuan X. [1 ,2 ]
Wan B. [1 ]
机构：
[1] State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang, 621000, Sichuan
[2] Computational Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang, 621000, Sichuan
来源：
Tu, Guohua (ghtu@skla.cardc.cn) | 1600年 / Beijing University of Aeronautics and Astronautics (BUAA)卷 / 35期
关键词：
Boundary layer transition; Flow control; Hypersonic; Porous surface; Transition delay;
D O I：
10.13224/j.cnki.jasp.2020.01.016
中图分类号：
学科分类号：
摘要：
The spatial-developing flat-plate boundary layer of Mach number of 6 was simulated. The influences of the two-dimensional transverse micro-cavities on the base flow and the second mode instability wave were studied by adding them on the flat-plate surface. Results indicated that the two-dimensional micro-cavity configuration had a larger size (more than 100μm) compared with the conventional porous coating. The comparison of the base flows showed that the micro-cavities had little effect on the streamwise velocity. No new instability mode appeared on the spectrum of the sampling point. The micro-cavities could be helpful to reduce the frictional drag. The drag caused by the pressure difference in the cavities was one to two orders of magnitude lower than the frictional drag. As the porosity increased, the total drag decreased. A reduction over 40% on the total drag can be reached when the porosity was 0.6. Two ways were employed for adding second mode instability waves at the inflow boundary, including a single-mode disturbance and a superposition of multi-modes disturbances. The downstream evolution indicated that the transverse micro-cavities had apparent suppression effect on the amplification of the second mode within a broadband frequency range, and the control effect became stronger with the increasing porosity. © 2020, Editorial Department of Journal of Aerospace Power. All right reserved.
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页码：135 / 143
页数：8
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