Wall skin friction analysis in a hypersonic turbulent boundary layer over a compression ramp
文献类型：期刊论文
| 作者 | Guo, Tongbiao2; Zhang, Ji1,2; Zhu, Yanhua1,2 ; Li, Xinliang1,2; Li XL(李新亮); Zhu YH(朱艳华)
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| 刊名 | JOURNAL OF FLUID MECHANICS
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| 出版日期 | 2024-05-31 |
| 卷号 | 988页码:32 |
| 关键词 | hypersonic flow shock waves turbulent boundary layers |
| ISSN号 | 0022-1120 |
| DOI | 10.1017/jfm.2024.442 |
| 通讯作者 | Li, Xinliang(lixl@imech.ac.cn) |
| 英文摘要 | 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%. |
| WOS关键词 | DIRECT NUMERICAL-SIMULATION ; LARGE-EDDY SIMULATION ; GORTLER VORTICES ; DECOMPOSITION ; FLOWS |
| 资助项目 | National Key Research and Development Program of China ; National Supercomputer Center in Tianjin (NSCC-TJ) ; National Supercomputer Center in Guangzhou |
| WOS研究方向 | Mechanics ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:001235590000001 |
| 资助机构 | National Key Research and Development Program of China ; National Supercomputer Center in Tianjin (NSCC-TJ) ; National Supercomputer Center in Guangzhou |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/95507]  |
| 专题 | 力学研究所_高温气体动力学国家重点实验室 |
| 通讯作者 | Li, Xinliang |
| 作者单位 | 1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Mech, LHD, Beijing 100190, Peoples R China |
| 推荐引用方式 GB/T 7714 | Guo, Tongbiao,Zhang, Ji,Zhu, Yanhua,et al. Wall skin friction analysis in a hypersonic turbulent boundary layer over a compression ramp[J]. JOURNAL OF FLUID MECHANICS,2024,988:32. |
| APA | Guo, Tongbiao,Zhang, Ji,Zhu, Yanhua,Li, Xinliang,李新亮,&朱艳华.(2024).Wall skin friction analysis in a hypersonic turbulent boundary layer over a compression ramp.JOURNAL OF FLUID MECHANICS,988,32. |
| MLA | Guo, Tongbiao,et al."Wall skin friction analysis in a hypersonic turbulent boundary layer over a compression ramp".JOURNAL OF FLUID MECHANICS 988(2024):32. |
入库方式： OAI收割
来源：力学研究所
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