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Excitation of non-modal perturbations in hypersonic boundary layers by free stream forcing: shock-fitting harmonic linearised Navier-Stokes approach

文献类型：期刊论文

作者Zhao, Lei2; Dong M(董明)1
刊名JOURNAL OF FLUID MECHANICS
出版日期2025-06-24
卷号1013页码:42
关键词boundary layer receptivity boundary layer stability shear-flow instability
ISSN号0022-1120
DOI10.1017/jfm.2025.10231
通讯作者Dong, Ming(dongming@imech.ac.cn)
英文摘要In this paper, we study the receptivity of non-modal perturbations in hypersonic boundary layers over a blunt wedge subject to free stream vortical, entropy and acoustic perturbations. Due to the absence of the Mack-mode instability and the rather weak growth of the entropy-layer instability within the domain under consideration, the non-modal perturbation is considered as the dominant factor triggering laminar-turbulent transition. This is a highly intricate problem, given the complexities arising from the presence of the bow shock, the entropy layer and their interactions with oncoming disturbances. To tackle this challenge, we develop a highly efficient numerical tool, the shock-fitting harmonic linearised Navier-Stokes (SF-HLNS) approach, which offers a comprehensive investigation on the dependence of the receptivity efficiency on the nose bluntness and properties of the free stream forcing. The numerical findings suggest that the non-modal perturbations are more susceptible to free stream acoustic and entropy perturbations compared with the vortical perturbations, with the optimal spanwise length scale being comparable with the downstream boundary-layer thickness. Notably, as the nose bluntness increases, the receptivity to the acoustic and entropy perturbations intensifies, reflecting the transition reversal phenomenon observed experimentally in configurations with relatively large bluntness. In contrast, the receptivity to free stream vortical perturbations weakens with increasing bluntness. Additionally, through the SF-HLNS calculations, we examine the credibility of the optimal growth theory (OGT) on describing the evolution of non-modal perturbations. While the OGT is able to predict the overall streaky structure in the downstream region, its accuracy in predicting the early-stage evolution and the energy amplification proves to be unreliable. Given its high-efficiency and high-accuracy nature, the SF-HLNS approach shows great potential as a valuable tool for conducting future research on hypersonic blunt-body boundary-layer transition.
分类号一类/力学重要期刊
WOS关键词NUMERICAL-SIMULATION ; NOSE BLUNTNESS ; TRANSITION ; RECEPTIVITY ; STABILITY ; DISTURBANCES ; INSTABILITY ; GROWTH
资助项目National Science Foundation of China[12372222] ; National Science Foundation of China[92371104] ; National Science Foundation of China[U20B2003] ; National Science Foundation of China[12002235] ; National Science Foundation of China[12588201] ; Strategic Priority Research Program, CAS[XDB0620102] ; CAS project for Young Scientists in Basic Research[YSBR-087]
WOS研究方向Mechanics ; Physics
语种英语
WOS记录号WOS:001513717300001
资助机构National Science Foundation of China ; Strategic Priority Research Program, CAS ; CAS project for Young Scientists in Basic Research
其他责任者董明
源URL[http://dspace.imech.ac.cn/handle/311007/101856]  
专题力学研究所_非线性力学国家重点实验室
作者单位1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
2.Tianjin Univ, Dept Mech, Tianjin 300072, Peoples R China;
推荐引用方式
GB/T 7714		 Zhao, Lei,Dong M. Excitation of non-modal perturbations in hypersonic boundary layers by free stream forcing: shock-fitting harmonic linearised Navier-Stokes approach[J]. JOURNAL OF FLUID MECHANICS,2025,1013:42.
APA Zhao, Lei,&董明.(2025).Excitation of non-modal perturbations in hypersonic boundary layers by free stream forcing: shock-fitting harmonic linearised Navier-Stokes approach.JOURNAL OF FLUID MECHANICS,1013,42.
MLA Zhao, Lei,et al."Excitation of non-modal perturbations in hypersonic boundary layers by free stream forcing: shock-fitting harmonic linearised Navier-Stokes approach".JOURNAL OF FLUID MECHANICS 1013(2025):42.

入库方式： OAI收割

来源：力学研究所

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