并联蒸发器平板式环路热管的实验研究

Experimental Study on Flat Type Loop Heat Pipe With Parallel Evaporator

实验设计了并联蒸发器平板式环路热管实验系统。通过实验发现:两个蒸发器施加相等或不等的热负荷时,系统都能启动运行;而只有一个蒸发器施加热负荷时,低充灌率下,较难启动,增加充灌率后,能够改善系统的启动,但会使系统的运行温度升高;在某一热负荷下,单个蒸发器单独启动失败,而两个蒸发器一起启动时,系统又能启动成功;在做总热负荷一定的变工况运行时,每个蒸发器壁面的温度随施加到其上的热负荷大小而变化,但回流液的流向可能会改变这个规律,并且两个蒸发器上的热负荷进行不同分配的运行时,冷凝器进口温度有一个最高值。

This experiment designed a flat type loop heat pipe with parallel evaporator. The experimental study indicates that the system can startup when equal or unequal heat load is applied to the two evaporators; only an evaporator is heated, the system is hard to startup with low charge ratio, and increasing the charge ratio can improve the startup, but will increase the system operating temperature; single evaporator fails to startup under a certain heat load, but the system can startup with two evaporators heated; when the total heat load applied to the two evaporators is constant, the wall temperature of each evaporator is in step with its own heat load, but the flow distribution of return liquid may change the rule, and a maximum value exists in the inlet temperature of the condenser when the heat load is applied to the two evaporators with different distribution.