机械泵驱动两相冷却系统启动特性的实验研究

Experimental Investigation on Start-up Characteristics of Mechanically Pumped Two-phase Cooling System

机械泵驱动两相冷却系统是一种以机械泵为驱动力的封闭式相变传热设备。该研究首先对该系统启动的加热增压、机械泵启动和热载启动三个阶段进行实验分析,并通过系统各主要参数的变化发现启动过程中将产生液体过热现象,并且有较大的压力冲击。然后通过大量实验对与过热度有关的启动温度、流量和启动热负荷进行比较分析,得出启动温度越低,产生的过热度越大的结论。最后对蒸发段在气态条件下启动进行实验研究,结果表明此时过热度要大于液体启动的过热度。

In order to investigate the start-up characteristics of MPLHP （Mechanicalty Pumped Loop Heat Pipe）, tests were carried out with different operation conditions. The results show that start-up can cause superheat for.the evaporator. Moreover, superheat temperature has little relationship with mass flow and heat load but it depends on evaporative temperature. The less the evaporative temperature is, the higher the superheat temperature is. It was also pointed out that the system designer should pay more attention to the system when system start-up without liquid in the evaporator. Because a larger temperature impact would happen to electrical equipment than the start-up process with liquid work fluid filling with the evaporator.