摘要
地面降压模拟技术是研究载人航天器舱内流动换热的有效手段,该技术的关键在于选取一个合适的舱内压力,使得地面条件下自然对流的影响得以消除。对应着某一个舱内压力,自然对流对流动换热的影响刚好得以消除,该舱内压力可定义为临界压力。文章利用数值模拟软件I-DEAS,针对处在独立飞行状态下的某一载人航天器,选取不同的舱内压力,分别对空间条件和地面条件下密封舱内的流动换热进行稳态数值模拟,得到了舱内温度分布和对流换热系数。在不同舱内压力下,通过比较空间条件和地面条件的计算结果,分析地面条件下自然对流对流动换热的影响是否得以消除。根据分析结果,给出了该载人航天器在使用地面降压模拟技术中的临界压力。
To study the convective 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 the lowering pressure method is to choose a critical pressure, which can exactly suppress the effect of the natural convection. In the present work, the convection heat transfer in a manned spacecraft is studied numerically under various pressures, both in space condition and terrestrial condition. The convective heat transfer coefficient and temperature distribution are obtained. Results were compared between in space condition and in terrestrial condition. The effect of pressure on suppressing the natural convection is analyzed quantitatively. The critical pressure in the lowering pressure method for this manned spacecraft is also obtained.
出处
《航天器工程》
2009年第5期108-113,共6页
Spacecraft Engineering
基金
国家重大科技专项工程
关键词
载人航天器
流动换热
地面降压模拟
临界压力
manned spacecraft
convective heat transfer
lowering pressure method
critical pressure
