Response of a hypersonic blunt cone boundary layer to slow acoustic waves with assessment of various routes of receptivity  

作　　者：Bingbing WAN Jisheng LUO Caihong SU 

机构地区：[1]Laboratory for High-Speed Aerodynamics, School of Mechanical Engineering, Tianjin University

出　　处：《Applied Mathematics and Mechanics(English Edition)》2018年第11期1643-1660,共18页应用数学和力学（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Nos.11472188 and11332007);the National Key Research and Development Program of China(No.2016YFA0401200)

摘　　要：The hypersonic boundary-layer receptivity to slow acoustic waves is investigated for the Mach 6 flow over a 5-degree half-angle blunt cone with the nose radius of 5.08 mm. The plane acoustic wave interacts with the bow shock, and generates all types of disturbances behind the shock, which may take various routes to generate the boundarylayer unstable mode. In this paper, two routes of receptivity are investigated in detail.One is through the disturbance in the entropy layer. The other is through the slow acoustic wave transmitted downstream the bow shock, which can excite the boundary-layer mode due to the synchronization mechanism. The results show that, for a low frequency slow acoustic wave, the latter route plays a leading role. The entropy-layer instability wave is able to excite the first mode near the neutral point, but its receptivity efficiency is much lower.The hypersonic boundary-layer receptivity to slow acoustic waves is investigated for the Mach 6 flow over a 5-degree half-angle blunt cone with the nose radius of 5.08 mm. The plane acoustic wave interacts with the bow shock, and generates all types of disturbances behind the shock, which may take various routes to generate the boundarylayer unstable mode. In this paper, two routes of receptivity are investigated in detail.One is through the disturbance in the entropy layer. The other is through the slow acoustic wave transmitted downstream the bow shock, which can excite the boundary-layer mode due to the synchronization mechanism. The results show that, for a low frequency slow acoustic wave, the latter route plays a leading role. The entropy-layer instability wave is able to excite the first mode near the neutral point, but its receptivity efficiency is much lower.

关 键 词：RECEPTIVITY entropy layer blunt cone hypersonic boundary layer 

分 类 号：V211.1[航空宇航科学与技术—航空宇航推进理论与工程]