毛细相变流体回路中蒸发器的预热启动特性研究

Investigation on Start-up Characteristic for Evaporator in a Capillary Loop with Phase Change

通过分析毛细管内液柱的动量方程,从力平衡的角度获得毛细相变流体回路系统的启动判别条件,并建立蒸发器的三维导热模型来研究系统的启动特性.研究表明:蒸发器的启动预热时间随启动热流的增大而减小;减小液体补偿腔的高度可以加快蒸发器的启动过程,且启动热流愈小该现象愈显著;在较低的启动热流条件下,减小蒸气槽道的宽度,可以减小启动预热时间,改善蒸发器启动性能,而在较高的热流密度下,其对蒸发器的启动性能影响不大.

The start-up criterion of the capillary loop system with phase change was obtained by analyzing the force equilibrium of the capillary liquid column,and a three-dimensional thermal conducting model of the evaporator is established to investigate the start-up characteristics of the system.The results show that the preheating time of the evaporator decreases with increasing of the heat flux;reducing the height of the liquid compensation chamber can speed up the startup process of the evaporator and the effect would be more significant under a lower startup heat flux;besides,the preheating time can be shortened by reducing the width of the steam channels under lower startup heat flux,while the effects are not significant under high heat flux.