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通过向环路热管内充装定量氮气来模拟实际不凝气体的生成,考察了不同不凝气体含量、热载荷和热沉温度条件下,环路热管工作性能的变化.结果显示不凝气体对工作性能造成的不利影响体现在:取决于热载荷和热沉温度,可导致稳态工作温度升高2~10℃;在小于60W的热载荷区间或者-5℃的热沉温度条件下,不凝气体导致的不利影响更加显著;改变控温性能,产生一个故障热载荷区间;启动时间、启动温度、启动温升增大;引发温度波动现象和系统运行失效.基于特征点温度的变化特性,分析并讨论了不凝气体影响环路热管工作性能的物理机理.
By simulating the formation of actual non-condensable gas by filling the loop heat pipe with quantitative nitrogen, the working performance of the loop heat pipe under different non-condensable gas content, heat load and heat sink temperature was investigated. The results showed that the non- Adverse effects caused by work performance are as follows: depending on the thermal load and the heat sink temperature, the steady-state operating temperature may increase by 2 to 10 ° C; under a heat load of less than 60 W or a heat-sink temperature of -5 ° C Condensation gas caused more significant adverse effects; change in temperature control performance, resulting in a fault heat load interval; start-up time, start-up temperature, start-up temperature increases; lead to temperature fluctuations and system failure. The physical mechanism of non-condensable gas affecting the performance of loop heat pipe is analyzed and discussed.