Variation character of stagnation point heat flux for hypersonic pointed bodies from continuum to rarefied flow states and its bridge function study
文献类型：期刊论文
| 作者 | Wang ZhiHui; Bao Lin; Tong BingGang |
| 刊名 | Science in china series g-physics mechanics & astronomy
 |
| 出版日期 | 2009-12-01 |
| 卷号 | 52期号:12页码:2007-2015 |
| 关键词 | Rarefied gas effects Sharp leading edge Hypersonic Stagnation point heat flux Bridge function |
| ISSN号 | 1672-1799 |
| DOI | 10.1007/s11433-009-0226-7 |
| 通讯作者 | Tong binggang(tongbg@gucas.ac.cn) |
| 英文摘要 | This paper is a research on the variation character of stagnation point heat flux for hypersonic pointed bodies from continuum to rarefied flow states by using theoretical analysis and numerical simulation methods. the newly developed near space hypersonic cruise vehicles have sharp noses and wingtips, which desires exact and relatively simple methods to estimate the stagnation point heat flux. with the decrease of the curvature radius of the leading edge, the flow becomes rarefied gradually, and viscous interaction effects and rarefied gas effects come forth successively, which results in that the classical fay-riddell equation under continuum hypothesis will become invalid and the variation of stagnation point heat flux is characterized by a new trend. the heat flux approaches the free molecular flow limit instead of an infinite value when the curvature radius of the leading edge tends to 0. the physical mechanism behind this phenomenon remains in need of theoretical study. firstly, due to the fact that the whole flow regime can be described by boltzmann equation, the continuum and rarefied flow are analyzed under a uniform framework. a relationship is established between the molecular collision insufficiency in rarefied flow and the failure of fourier's heat conduction law along with the increasing significance of the nonlinear heat flux. then based on an inspiration drew from burnett approximation, control factors are grasped and a specific heat flux expression containing the nonlinear term is designed in the stagnation region of hypersonic leading edge. together with flow pattern analysis, the ratio of nonlinear to linear heat flux w, is theoretically obtained as a parameter which reflects the influence of nonlinear factors, i.e. a criterion to classify the hypersonic rarefied flows. ultimately, based on the characteristic parameter w, a bridge function with physical background is constructed, which predicts comparative reasonable results in coincidence well with dsmc and experimental data in the whole flow regime. |
| WOS关键词 | VISCOUS-FLOW |
| WOS研究方向 | Physics |
| WOS类目 | Physics, Multidisciplinary |
| 语种 | 英语 |
| WOS记录号 | WOS:000272622300027 |
| 出版者 | SCIENCE PRESS |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2395062 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Tong BingGang |
| 作者单位 | Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang ZhiHui,Bao Lin,Tong BingGang. Variation character of stagnation point heat flux for hypersonic pointed bodies from continuum to rarefied flow states and its bridge function study[J]. Science in china series g-physics mechanics & astronomy,2009,52(12):2007-2015. |
| APA | Wang ZhiHui,Bao Lin,&Tong BingGang.(2009).Variation character of stagnation point heat flux for hypersonic pointed bodies from continuum to rarefied flow states and its bridge function study.Science in china series g-physics mechanics & astronomy,52(12),2007-2015. |
| MLA | Wang ZhiHui,et al."Variation character of stagnation point heat flux for hypersonic pointed bodies from continuum to rarefied flow states and its bridge function study".Science in china series g-physics mechanics & astronomy 52.12(2009):2007-2015. |
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来源：中国科学院大学
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