降压法抑制自然对流的数值模拟

具有强迫流动的航天器密封舱在地面模拟试验时常用降压法来抑制自然对流的影响，但降压比的确定往往取决于一些未知参数，这些参数的不确定使得自然对流的抑制效果难以保证，该文提出了一种通过数值模拟验证来确定降压比的方法，以某航天器密封舱为原型，通过直接对在轨飞行和不同舱压地面状态进行数值模拟，得出了最佳降压比。

Numerical Evaluation on the Suppression of Natural Convection Using Lowering Pressure Method

Natural convection is often practically suppressed or eliminated by lowering the cabin pressure in the ground test of spacecraft. Parameters affecting the optimum pressure are unknown in general, thus resulting in uncertainty of the effect of the suppression. The method determining the optimum pressure via numerical analysis is proposed in this paper. Spacecraft cabins on the ground with various pressures are simulated. Analytical results are compared directly with that of the cabin in orbit, thus figuring out the optimum pressure on the ground to simulate a flying cabin.