地面传热实验的微重力修正模拟

Numerical Correlation of Convections in an Enclosure under Micro-gravity and terrestrial Gravity.

目的使空间飞行器地面传热实验的结果能够有效地应用到空间微重力条件下。方法用数值模拟的方法研究了矩形空间内 45°对称间隔斜进风以及垂直进风的流动和换热情况 ,壁面条件为等壁温或等热流。对重力和微重力两种情况进行了对比。结果对等壁温情况 ,提出了表征空间飞行器舱内换热的关系式 ,并且将数值计算所得数据按这些关系式进行了最小二乘拟合 ,得到了空间微重力工况和地面工况下的换热关系式。对等热流情况 ,本文列出了重力和微重力条件下的最高壁面温度值 ,给出了两种情况时最高壁面温度的拟合公式。结论根据本文的方法 ,可以对地面模型装置的实验结果进行修正 ,得到空间飞行器原型内的换热情况。

s: Objective To apply the ground based heat transfer experimental results to the spacecraft in micro gravity. Method The flow and heat transfer characteristics in a square cavity were investigated numerically, for a symmetric interval 45°oblique air inlet pattern and vertical air inlet pattern, with boundary conditions of uniform temperature and uniform heat flux at vertical walls. The results in conditions of gravity and micro gravity were compared. Result First, the heat transfer correlation formula in spacecraft were presented under the condition of uniform wall temperature. Second, the data of numerical simulation were fitted with the Least Square Method. And the correlation for cases under gravity and micro gravity were obtained. Finally, for the boundary condition of uniform heat flux, the fitting equations of maximum wall temperature in the condition of gravity and micro gravity were given and the values of maximum wall temperature were listed in a table. Conclusion The heat transfer characteristics in the spacecraft under micro gravity can be predicted from those correlation obtained from ground based results.