| 降压地面模拟技术中的临界压力研究 |
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| 引用本文： | 赵锐,程文龙,刘期聂,黄家荣,卢威.降压地面模拟技术中的临界压力研究[J].工程热物理学报,2009,30(12). |
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| 作者姓名： | 赵锐 程文龙 刘期聂 黄家荣 卢威 |
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| 作者单位： | 1. 中国科学技术大学热科学和能源工程系,安徽,合肥,230027
2. 中国空间技术研究院,北京,100086 |
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| 摘 要： | 利用降压地面模拟技术,可以抑制自然对流的影响,从而通过地面试验结果还原空间密封舱内的流动换热情况.降压法的关键在于确定临界压力,使得自然对流对流动换热的影响刚好得到忽略.本文使用数值模拟方法确定临界压力比,以方腔密封舱内的流动换热情况为例,计算了不同 Gr/Re2 数和压力比下密封舱内的流动换热情况.得到了舱内气体温度分布和对流换热系数.通过比较空间情况和地面情况的计算结果,分析了自然对流给流动换热带来的影响,给出了判断临界压力的准则式,并给出了临界 Gr/Re2 数.
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| 关 键 词： | 地面降压模拟 自然对流 临界压力 准则式 |
LOWERING PRESSURE METHOD IN SPACECRAFTS |
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| ZHAO Rui,CENG Wen-Long,LIU Qi-Nie,HUANG Jia-Rong,LU Wei.LOWERING PRESSURE METHOD IN SPACECRAFTS[J].Journal of Engineering Thermophysics,2009,30(12). |
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| Authors: | ZHAO Rui CENG Wen-Long LIU Qi-Nie HUANG Jia-Rong LU Wei |
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| Institution: | ZHAO Rui~1 CENG Wen-Long~1 LIU Qi-Nie~1 HUANG Jia-Rong~2 LU Wei~2 (1.Department of Thermal Science and Energy Engineering,Univ.of Sci.and Tech.of China,Hefei 230027,China,2.China Academy of Space Technology,Beijing 100086,China ) |
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| Abstract: | To study the convection heat transfer in spacecraft cabins,the lowering pressure method is usually used to suppress the effect of natural convection in terrestrial experiments.The key of lowering pressure method is to quantify a critical pressure,assuring the effect of natural convection on convection heat transfer,is exactly suppressed.In the present work,the convection heat transfer in a cubical cabin is studied numerically under various Gr/Re~2 and various pressures,both in space condition and terrestria... |
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| Keywords: | lowering pressure method natural convection critical pressure correlation |
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