补偿腔支路对环路热管传热性能影响的实验研究

Experimental study of compensated cavity branch influence on heat transfer characteristics of loop heat pipe

在环路热管系统工作中,存在因补偿腔温度过高而造成的蒸发器烧干现象。在常规环路热管系统中设计了补偿腔支路,以带走热源向补偿腔传递的径向热量,并对设计的环路热管系统进行实验测试,分析补偿腔支路对环路热管传热特性的影响。实验结果表明:补偿腔支路开启后,在热流密度14 W/cm^(2)时,系统稳定启动所需时间从4 min减少到3 min,表明系统稳定启动所需时间减小,有利于快速启动;在热流密度18 W/cm^(2)下,对应的壁面温度从88.2℃降至85.4℃,系统热阻从0.56 K/W减小到了0.49 K/W,表明系统所能承受的最大热流密度更大,系统热阻也更低,因此系统的传热性能更好。

In the operation of the loop heat pipe system, the evaporator can be burned dry because the temperature of the compensation cavity is too high.A compensation cavity branch was designed in a conventional loop heat pipe system to take away the radial heat transferred from the heat source to the compensation cavity, and an experimental test was carried out on the designed loop heat pipe system to analyze the influence of the compensation cavity branch on the heat transfer characteristics of the loop heat pipe. The results show that after the compensator branch is opened, when the heat flux is 14 W/cm^(2), the time needed for the stable startup of the system decreases from 4 min to 3 min, indicating that the time needed for the stable startup of the system decreases, which is conducive to the rapid startup. When the heat flux is 18 W/cm^(2), the corresponding wall temperature drops from 88.2 ℃ to 85.4 ℃, and the thermal resistance of the system decreases from 0.56 K/W to 0.49 K/W, indicating that the maximum heat flux that the system can withstand is larger and the thermal resistance of the system is lower, so the heat transfer characteristics of the system is better.