环路热虹吸管间歇沸腾可视化实验研究  

Visualized Experimental Investigation on the Two-phase Instability in a Closed Loop Thermosyphon

作　　者：刘云 李志刚[1] 李玉华[1] 姜玉雁[1] 梁世强[1,2] LIU Yun;LI Zhi-Gang;LI Yu-Hua;JIANG Yu-Yan;LIANG Shi-Qiang(Institute of Engineering Thermophysics,CAS,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院工程热物理研究所,北京100190 [2]中国科学院大学,北京100049

出　　处：《工程热物理学报》2021年第1期215-221,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.51576195)。

摘　　要：针对两相环路热虹吸管中出现的间歇沸腾不稳定现象,分别以R134a、水和无水乙醇作为工质,通过流场可视化实验观测,探究了间歇沸腾出现的条件及其对环路传热特性的影响。实验结果表明,在中等充液率和中等加热热流密度条件下更容易发生间歇沸腾现象;流型的周期性变化引起环路内部压力和温度波动,同时会增加环路的均温性;流型变化和波动特性因工质不同而有所差别,水作为工质时,波动周期更长,流型变化及压力波动更复杂。The onset condition of geyser boiling instability in a two-phase closed loop thermpsyphon and its influence on the heat transfer characteristics are investigated by flow visualization experiment with the working fluid of R134 a,water and ethanol,respectively.The results show that,geyser boiling is more liable to occur under moderate filling ratios and moderate heat flux.The periodic changes of flow patterns cause the oscillation of pressure and temperature in the loop,while enhancing the temperature uniformity.Flow pattern variations and oscillation characteristics are different depending on working fluids.The oscillating period of water is longer,with more complex flow patterns and pressure oscillations.

关 键 词：环路热虹吸管 间歇沸腾 两相流不稳定性 流场可视化 

分 类 号：TK172.4[动力工程及工程热物理—热能工程]