Prediction on the Flow and Heat Transfer Performance of Rarefied Gas over Objects in Free Molecular Flow Regime

doi:10.7652/xjtuxb201903002

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Prediction on the Flow and Heat Transfer Performance of Rarefied Gas over Objects in Free Molecular Flow Regime

更新时间：2025-07-09

- Prediction on the Flow and Heat Transfer Performance of Rarefied Gas over Objects in Free Molecular Flow Regime
- Vol. 53, Issue 3, Pages: 6-12(2019)
- 作者机构：
  
  1. 西安交通大学能源与动力工程学院,西安,710049
  2. 航天低温推进剂技术国家重点实验室,北京,100028
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201903002
  CLC： V411.1
- Online First：10 March 2019，
  
  Published：2019
- 稿件说明：
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Prediction on the Flow and Heat Transfer Performance of Rarefied Gas over Objects in Free Molecular Flow Regime[J]. 2019, 53(3): 6-12.
DOI：

Prediction on the Flow and Heat Transfer Performance of Rarefied Gas over Objects in Free Molecular Flow Regime[J]. 2019, 53(3): 6-12. DOI： 10.7652/xjtuxb201903002.

摘要

针对自由分子流区稀薄气体外掠物体流动与传热问题

基于气体分子动理论方法和相对坐标系思想

推导了预测大气外掠平板和圆柱体传热与流动的无量纲表达式

讨论了雷诺数、马赫数和克努森数对阻力与传热性能的影响。结果表明:在马赫数一定时

随着克努森数不断增加

稀薄气体外掠物体换热能力逐渐减弱; 在克努森数一定时

低马赫数(Ma<0.1)对传热性能影响不大

但高马赫数(Ma>0.1)对传热性能影响显著; 随着马赫数增加

流动阻力先急剧下降

当到达超声速时逐渐变缓。该研究结果可为飞行器在自由分子流区流动与传热性能预测方面提供理论依据和技术支持。

Abstract

Aiming at the problem of flow and heat transfer of rarefied gas over objects in free molecular flow regime and based on gas molecular kinetic theory and relative coordinate system

dimensionless expressions for predicting the flow and heat transfer performance of gas over flat plates and cylinders are deduced

and the effects of Reynolds number

Mach number and Knudsen number on flow resistance and heat transfer performance are discussed. This research shows that the heat transfer ability gradually weakens with the increasing of Knudsen number when the Mach number is constant; when the Knudsen number is constant

low Mach number(Ma<0.1)has little effect on the heat transfer performance

but high Mach number(Ma>0.1)has significant effect on the heat transfer performance. As the Mach number increases

the flow resistance drops sharply first

and then gradually slows down while reaching the supersonic speed. This study can provide theoretical basis and technical support for the prediction of the flow and heat transfer performance of rarefied gas over aircraft in the free molecular flow regime.

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厉彦忠 1

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Related Institution

State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University

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