机械泵驱动冷却回路在模拟航天温度边界下散热能力分析

 对机械泵驱动两相冷却系统在模拟太空工作的边界问题条件下散热能力和工作特性进行实验研究，从而得到结论：当系统的热负荷较小而边界温度较低时，放热量变大使系统平均温度降低，造成蒸发段温度无法控制，冷凝器的温度也可能会降到低于工质的凝固点冻结，冷凝段管路也将因固态工质堵塞而无法循环，此时需采取降低储液器设定温度的方法来减小系统的放热量。当系统的热负荷较大而边界温度较高时，系统在冷凝器的放热量较小而使得热负荷无法完全释放时，系统的平均温度上升，造成泵的入口温度达到工质的饱和温度，产生的气泡有可能会对机械泵内的部件产生气蚀，并引起机械泵工作不稳定，无法保证设定的流量循环。实验结论为该类系统的设计与应用提供了可靠的依据。

Experimental Investigation on Cooling Capacity ofThe MPCL System Under Simulated Space Boundary Conditions

The two phase mechanical pumped cooling loop (MPCL) is a promising thermal control system.Experiments have been carried out to investigate cooling capacity and running characteristics under simulated temperature boundary conditions and variation heat load. It is concluded: when the condensers’ heat rejection is higher than heat load on the evaporators, the system average temperature becomes lower and lower, which may lead to working fluid freezing in the condensers. It must decrease the set point evaporative temperature by controlling the accumulator. On the contrary, when the condensers’ heat rejection is lower than heat load on the evaporators, the system average temperature becomes higher and higher, which may cause bubble appearing at the pump inlet and pump cavitation corrosion. It is necessary to increase the set point to avoid the pump running in an unstable station. All conclusions proved strong supporting for the system design and space applications