| Wall skin friction analysis in a hypersonic turbulent boundary layer over a compression ramp | |
Guo TB(郭同彪)1; Zhang J(张继)1,2; Zhu YH(朱艳华)1,2 ; Li XL(李新亮)1,2
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| Corresponding Author | Li, Xinliang([email protected]) |
| Source Publication | JOURNAL OF FLUID MECHANICS
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| 2024-05-31 | |
| Volume | 988Pages:32 |
| ISSN | 0022-1120 |
| Abstract | In this paper, direct numerical simulations in hypersonic turbulent boundary layers over a 24 degrees compression ramp at Mach 6.0 are performed. The wall skin friction and its spanwise non-homogeneity in the interaction region are analysed via the spectral analysis and drag decomposition method. On the compression ramp, the premultiplied spanwise energy spectrum of wall shear stress tau(w) reveals two energetic spanwise length scales. One occurs in the region of x/delta(ref) = 0-3 (x = 0 lies in the compression corner; delta(ref) is the boundary layer thickness upstream of the interaction region) and is consistent with that of the large-scale streamwise vortices, indicating that the fluctuation intensity of tau(w) is associated with the Gortler-type structures. The other one is observed downstream of x/delta(ref) = 3.0 and corresponds to the regenerated elongated streaky structures. The fluctuation intensity of tau(w) peaks at x/delta(ref) = 3.0, where both the above energetic length scales are observed. The drag decomposition method proposed by Li et al. (J. Fluid Mech., vol. 875, 2019, pp. 101-123) is extended to include the effects of spanwise non-homogeneity so that it can be used in the interaction region where the mean flow field and the mean skin friction C-f exhibit an obvious spanwise heterogeneity. The results reveal that, in the upstream turbulent boundary layer, the drag contribution arising from the spanwise heterogeneity can be neglected, while this value on the compression ramp is up to 20.7% of C-f, resulting from the Gortler-type vortices. With the aid of the drag decomposition method, it is found that the main flow features that contribute positively to the amplification of C-f and its rapid increase on the compression ramp includes: the density increase across the shock, the high mean shear stress and turbulence amplification around the detached shear layer and the Favre-averaged downward velocity towards the ramp wall. Compared with the spanwise-averaged value, C-f and its components at the spanwise station where the downwash and upwash of the Gortler-type vortices occur reveal a spanwise variation exceeding 10%. |
| Keyword | hypersonic flow shock waves turbulent boundary layers |
| DOI | 10.1017/jfm.2024.442 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:001235590000001 |
| WOS Keyword | DIRECT NUMERICAL-SIMULATION ; LARGE-EDDY SIMULATION ; GORTLER VORTICES ; DECOMPOSITION ; FLOWS |
| WOS Research Area | Mechanics ; Physics |
| WOS Subject | Mechanics ; Physics, Fluids & Plasmas |
| Funding Project | National Key Research and Development Program of China ; National Supercomputer Center in Tianjin (NSCC-TJ) ; National Supercomputer Center in Guangzhou |
| Funding Organization | National Key Research and Development Program of China ; National Supercomputer Center in Tianjin (NSCC-TJ) ; National Supercomputer Center in Guangzhou |
| Classification | 一类/力学重要期刊 |
| Ranking | 1 |
| Contributor | Li, Xinliang |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/95508 |
| Collection | 高温气体动力学国家重点实验室 |
| Affiliation | 1.Chinese Acad Sci, Inst Mech, LHD, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China |
| Recommended Citation GB/T 7714 | Guo TB,Zhang J,Zhu YH,et al. Wall skin friction analysis in a hypersonic turbulent boundary layer over a compression ramp[J]. JOURNAL OF FLUID MECHANICS,2024,988:32.Rp_Au:Li, Xinliang |
| APA | 郭同彪,张继,朱艳华,&李新亮.(2024).Wall skin friction analysis in a hypersonic turbulent boundary layer over a compression ramp.JOURNAL OF FLUID MECHANICS,988,32. |
| MLA | 郭同彪,et al."Wall skin friction analysis in a hypersonic turbulent boundary layer over a compression ramp".JOURNAL OF FLUID MECHANICS 988(2024):32. |
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