并行蒸发器机械泵驱动两相冷却系统特性的实验研究

Experiment on Two-phase Cooling System with Dual-Evaporator Driven by Mechanical Pump

机械泵驱动两相流冷却系统是一种新型的航天电子发热元件的冷却环路,其实验研究较少。文章通过启动实验和周期性边界实验对系统基本特性进行研究,结果表明:启动过程蒸发段上下两侧保持稳定状态,工质在各蒸发器支路温度都呈现从液态单相到过热液态再到两相的变化趋势,并且过热时间略有不同,这主要是由于管路布局不同和以及重力作用的影响;周期边界温度变化实验表明即使在冷凝器的边界温度波动超过30℃的条件下系统仍然保持良好的散热,并且在总长度约12米的蒸发段保持小于0.5℃温差。

Experiments on start process and periodic boundary temperature change of a two-phase cooling loop driven by a mechanical pump were conducted to investigate the characteristics of the system. CO2 was adopted to be the working fluid in the system with a dual-evaporator. The results indicate that both sides of the evaporation section exhibited steady performance during start process. The fluid temperature in the each branch pipe changed in the same tendency and only superheat time was slightly different because of different pipe arrangement and gravity. The experiment of periodic boundary temperature change shows that the system could be effective to heat emission even if the boundary temperature fluctuation of the condenser was greater than 30℃, and the temperature difference of the evaporation section with the length of 12m was smaller than 0.5℃.