The influence of hypersonic free-stream conicity on the flow over a sphere
文献类型：期刊论文
| 作者 | Gu, Sangdi2; Wen, ChihYung2; Hao, Jiaao2; Wang WT(王文韬)1 ; Wang Q(汪球)1; Wang Q(汪球); Wang Q(汪球)
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| 刊名 | JOURNAL OF FLUID MECHANICS
 |
| 出版日期 | 2024-07-29 |
| 卷号 | 989页码:46 |
| 关键词 | laminar reacting flows |
| ISSN号 | 0022-1120 |
| DOI | 10.1017/jfm.2024.489 |
| 通讯作者 | Gu, Sangdi(sangdi.gu@polyu.edu.hk) |
| 英文摘要 | The influence of free-stream conicity on the various aspects of the flow over a spherical test model is examined using both analytical and numerical methods. For the analytical method, a simple closed-form analytical model is assembled. Six different free-stream conditions with different Mach numbers, Reynolds numbers and thermochemistry are tested at four different degrees of conicity corresponding to those which can realistically be encountered in experiments. It is found that the results around the stagnation point are mostly insensitive to the flow condition and gas type, except for some mild non-equilibrium effects, and excellent agreement between the analytical and numerical results exists. The shock stand-off distance on the stagnation streamline is shown to decrease with increasing conicity. This decrease increases the tangential velocity gradient at the stagnation point, increasing the stagnation point heat flux and decreasing the stagnation point boundary layer thickness. The free-stream conicity is also found to alter the normalized distributions of the shock stand-off distance, heat flux, surface pressure and boundary layer thickness with the angle from the stagnation point. In general, increasing the conicity magnifies the slope of these distributions. Regarding the boundary layer transition, it is found that, if it occurs in a uniform free stream, it would also occur in a conical free stream, albeit with the transition point shifted upstream closer to the stagnation point due to the increase in the boundary layer edge tangential velocity. Overall, considering the relevant experimental uncertainties, corrections for free-stream conicity are generally recommended when larger test models are used. |
| 分类号 | 一类/力学重要期刊 |
| WOS关键词 | POINT HEAT-TRANSFER ; HIGH-ENTHALPY-FLOW ; BLUNT-BODY PROBLEM ; BOUNDARY-LAYER ; DESIGN ; PERFORMANCE ; TRANSITION ; ROUGHNESS ; NOZZLE |
| WOS研究方向 | Mechanics ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:001278343400001 |
| 其他责任者 | Gu, Sangdi |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/96190]  |
| 专题 | 力学研究所_高温气体动力学国家重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, 15 Beisihuanxi Rd, Beijing 100190, Peoples R China 2.Hong Kong Polytech Univ, Dept Aeronaut & Aviat Engn, Kowloon, Hong Kong, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Gu, Sangdi,Wen, ChihYung,Hao, Jiaao,et al. The influence of hypersonic free-stream conicity on the flow over a sphere[J]. JOURNAL OF FLUID MECHANICS,2024,989:46. |
| APA | Gu, Sangdi.,Wen, ChihYung.,Hao, Jiaao.,王文韬.,汪球.,...&Wang Q.(2024).The influence of hypersonic free-stream conicity on the flow over a sphere.JOURNAL OF FLUID MECHANICS,989,46. |
| MLA | Gu, Sangdi,et al."The influence of hypersonic free-stream conicity on the flow over a sphere".JOURNAL OF FLUID MECHANICS 989(2024):46. |
入库方式： OAI收割
来源：力学研究所
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