Development of second-mode instability in a Mach 6 flat plate boundary   layer with two-dimensional roughness

doi:10.1063/1.4922389

CORC > 北京大学 > 工学院

	Development of second-mode instability in a Mach 6 flat plate boundary layer with two-dimensional roughness
	Tang, Qing ; Zhu, Yiding ; Chen, Xi ; Lee, Cunbiao
刊名	PHYSICS OF FLUIDS
	2015
关键词	SMALL-AMPLITUDE DISTURBANCES IMPINGING SHOCK-WAVE NUMERICAL INVESTIGATIONS RAYLEIGH-SCATTERING TRANSITION STABILITY FLOW SIMULATION MA=4.8
DOI	10.1063/1.4922389
英文摘要	Particle image velocimetry, PCB pressure sensors, and planar Rayleigh scattering are combined to study the development of second-mode instability in a Mach 6 flow over a flat plate with two-dimensional roughness. To the best of the authors' knowledge, this is the first time that the instantaneous velocity fields and flow structures of the second-mode instability waves passing through the roughness are shown experimentally. A two-dimensional transverse wall blowing is used to generate second-mode instability in the boundary layer and seeding tracer particles. The two-dimensional roughness is located upstream of the synchronization point between mode S and mode F. The experimental results showed that the amplitude of the second-mode instability will be greatly increased upstream of the roughness. Then it damps and recovers quickly in the vicinity downstream of the roughness. Further downstream, it acts as no-roughness case, which confirms Fong's numerical results [K. D. Fong, X. W. Wang, and X. L. Zhong, "Numerical simulation of roughness effect on the stability of a hypersonic boundary layer," Comput. Fluids 96, 350 (2014)]. It also has been observed that the strength of the amplification and damping effect depends on the height of the roughness. (C) 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.; National Natural Science Funds of China for Distinguished Young Scholar group [10921202, 11221061]; SCI(E); EI; ARTICLE; cblee@mech.pku.edu.cn; 6; 27
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/419632]
专题	工学院
推荐引用方式 GB/T 7714	Tang, Qing,Zhu, Yiding,Chen, Xi,et al. Development of second-mode instability in a Mach 6 flat plate boundary layer with two-dimensional roughness[J]. PHYSICS OF FLUIDS,2015.
APA	Tang, Qing,Zhu, Yiding,Chen, Xi,&Lee, Cunbiao.(2015).Development of second-mode instability in a Mach 6 flat plate boundary layer with two-dimensional roughness.PHYSICS OF FLUIDS.
MLA	Tang, Qing,et al."Development of second-mode instability in a Mach 6 flat plate boundary layer with two-dimensional roughness".PHYSICS OF FLUIDS (2015).