中国空间科学技术

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低真空、微重力对空间装置中气体自然对流传热的相似影响

奚日升,王康   

  1. 兰州物理研究所 ,兰州物理研究所
  • 发布日期:1992-10-25

ANALOGIC EFFECT OF LOW VACUUM AND MICROGRAVITY ON NATURAL CONVECTIVE TRANSFER OF HEAT IN GASES IN SPACE DEVICES

Xi Risheng Wang Kang (Lanzhou Institute of Physics)   

  • Published:1992-10-25

摘要： 以空间装置中气体自然对流传热问题为目标,导出显含温度和压强两个独立热力学参数的Rayleigh 数和Knudsen 数的表达式,分析了各个特征压强段气体传热的不同状态,比较了在连续介质流动中低真空(压强大于10Pa)和微重力对空间装置中气体自然对流传热的相似影响,导出了气体压强与重力对低真空气体自然对流的影响的相似性关系式,由此可以推断低真空或微重力状态下气体自然对流的强弱的相互关系。

关键词: 航天器部件, 真空, 失重, 对流传热, 相似模拟

Abstract: The problem of natural convective transfer of heat in gases in space devices is taken to be an objective. The Rayleigh number and Knud- sen number,which are obviously expressed as the function of temperature and pressure,two independent parameters of thermodynamics,are derived. The different situation of gaseous transfer of heat in each characteristic pressure section is analyzed. The analogic effect of low vacuum and microgravity on natural convective gaseous transfer of heat in the continuous medium flow in space devices is compared.

Key words: Spacecraft component, Vacuum, Weightlessness, Convection heat transfer, Analog simulation