| 引用本文: | 李宪开,张志雨,何淼生,等.高超声速圆柱绕流中驻点热流的稀薄效应.[J].国防科技大学学报,2022,44(5):180-186.[点击复制] |
| LI Xiankai,ZHANG Zhiyu,HE Miaosheng,et al.Rarefaction effect on the stagnation point heat flux in hypersonic cylinder flows[J].Journal of National University of Defense Technology,2022,44(5):180-186[点击复制] |
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| 高超声速圆柱绕流中驻点热流的稀薄效应 |
| 李宪开1,2,张志雨2,何淼生3,朱斌镔2,柳军1 |
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(1. 国防科技大学 空天科学学院, 湖南 长沙 410073;2. 沈阳飞机设计研究所扬州协同创新研究院有限公司, 江苏 扬州 225000;3. 上海交通大学 航空航天学院, 上海 200240)
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| 摘要: |
| 采用Fay-Riddell关系式、直接模拟Monte Carlo方法和基于直接模拟Monte Carlo流场温度的Fourier传热三种热流表达方式,分别对比研究了不同来流克努森数(Kn)和不同来流马赫数(Ma)的结果,以期从微观视角给出经典连续方法在稀薄流区高估驻点热流的新理解。结果表明,驻点热流的稀薄效应体现在三个方面:一是温度跳跃,削弱温度梯度导致驻点热流降低；二是壁面附近平动非平衡,导致Fourier热传导定律失效且高估热流；三是壁面约束,致使Fourier热传导定律在距壁面3倍分子平均自由程内高估热流。 |
| 关键词: 驻点热流 稀薄效应 直接模拟Monte Carlo 平动非平衡 |
| DOI：10.11887/j.cn.202205019 |
| 投稿日期：2022-03-04 |
| 基金项目:航空科学基金资助项目(2019ZA0Z9001) |
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| Rarefaction effect on the stagnation point heat flux in hypersonic cylinder flows |
| LI Xiankai1,2, ZHANG Zhiyu2, HE Miaosheng3, ZHU Binbin2, LIU Jun1 |
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(1. College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China;2. Shenyang Aircraft Design Institute Yangzhou Collaborative Innovation Research Institute Co., Ltd., Yangzhou 225000, China;3. School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai 200240, China)
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| Abstract: |
| The Fay-Riddell correlation, direct simulation Monte Carlo method, and the Fourier heat transfer expression based on direct simulation Monte Carlo flow field temperature were considered. Cases with different freestream Knudsen numbers (Kn) and Mach numbers (Ma) were studied to provide a new understanding of the classical continuum method to overestimate the stagnation point heat flux in the rarefied region from the microscopic perspective. The related results show that the rarefied effect on the stagnation point heat flux includes three aspects. The temperature jump upon the wall decreases the temperature gradient, reducing the stagnation point heat flux. The translational nonequilibrium was found near the wall, which leads to the failure of the Fourier heat conduction law and overestimates the heat flux. The wall-bound effect makes the Fourier heat conduction law overestimates the heat flux located three times the mean free path away from the wall. |
| Keywords: stagnation point heat flux rarefied effect direct simulation Monte Carlo translational nonequilibrium |
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