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重力對載人航天器密封艙內空氣對流換熱影響的數值分析

Numerical analysis of the influence of gravity on the air convection heat transfer in manned spacecraft pressured cabins

  • 摘要: 地面重力環(huán)境中進行航天器密封艙內空氣通風換熱試驗時，由于自然對流的存在導致換熱量和溫度分布與空間微重力環(huán)境中的情況存在偏差。文章針對航天器密封艙，建立了艙內空氣對流換熱的數值模型，利用數值模擬軟件對有無重力時典型工況下的對流換熱進行了數值模擬及模擬結果的對比分析。分析表明重力對壁面換熱量的影響較大，而對空氣溫度及分布的影響較小；且重力的影響隨空氣與壁面溫差的增大而增大，隨通風流量的增大而減小，艙間通風也會減小重力的影響。因此在重力環(huán)境中進行試驗時需要對壁面換熱量進行修正。

     

    Abstract: The natural convection results of the heat transfer and the temperature distribution under the on-orbit condition in the manned spacecraft pressured cabin would be different from those obtained during the terrestrial test. A numerical model for the manned spacecraft pressured cabin is built and solved by the simulation software. The results including the 1g and 0g states are compared with respect to the air flow and the heat transfer. It is shown that the gravity has a significant effect on the heat transfer of the wall. and liale effect on the air temperature. The effect of the gravity becomes more significant with the increase of the temperature difference between the air and the wall. The air flow enhancement and the ventilation between cabins impair the effect ofthe gravity. A correction must be made for the heat transfer ofthe wall during the terrestrial test in a gravity field.

     

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