泵辅助毛细相变回路的启动性能研究  

Performance Study of Pump-Assisted Capillary Phase Change Loop With Startup

作　　者：江驰[1] 刘志春[1] 杨金国[1] 段斌[1] 罗小兵[1] 刘伟[1] 

机构地区：[1]华中科技大学能源与动力工程学院,湖北武汉430074

出　　处：《工程热物理学报》2016年第11期2457-2462,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51276071)

摘　　要：本文对第三代泵辅助毛细相变回路启动性能进行研究,采用自主设计的离心微泵作为驱动力。研究发现,蒸发器初始气液分布对系统启动有较大影响,蒸气槽道内初始积液量直接影响蒸气腔内液体过热度和加热面的温度"过冲"。而且,蒸气槽道内积液增大了蒸气流动阻力,导致系统换热能力下降,积液消失,加热面的温度下降。在高热负荷工况,补偿腔内易发生工质相变,蒸发器换热能力略有提升。补偿腔一侧液体循环量增大,工质相变过程消失。In this work, the third generation of pump-assisted capillary phase change loop was experimentally investigated. The mechanical pumping force was provided by the impeller pump, which was designed and fabricated autonomously. Test results indicated that the initial liquid-vapor distribution in the evaporator had a great impact on the startup characteristics of the loop. The initial accumulated liquid before startup directly affected the degree of liquid superheating and temperature overshoot of the heater surface. Moreover, due to the accumulated liquid in the vapor channels, the vapor flow resistance in the evaporator increased leading to the decrease of the heat transfer capability of the evaporator. As the accumulated liquid vanished, a sharp temperature drop appeared on the heater surface. Under high heat loads, phase change would occur in the compensation chamber. As a result, the heat transfer capability of the evaporator had a certain enhancement. The phase change in the compensation chamber would vanished, as soon as the liquid flow rate in the compensation chamber increased.

关 键 词：泵辅助 启动 初始状态 相变 

分 类 号：TK124[动力工程及工程热物理—工程热物理]