插管对基于AMTEC太阳能热发电的毛细芯蒸发器性能的影响  

EFFECT OF BAYONET TUBE ON PERFORMANCE OF CAPILLARY POROUS WICK EVAPORATOR BASED ON AMTEC SOLAR THERMAL POWER GENERATION

作　　者：吴双应[1,2] 曹宝喜[1,2] 肖兰[1,2] 李友荣[1,2] 

机构地区：[1]重庆大学低品位能源利用技术及系统教育部重点实验室 [2]重庆大学动力工程学院,重庆400044

出　　处：《太阳能学报》2013年第2期277-282,共6页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51076171);重庆市自然科学基金(CSTC 2010BB6062);中央高校基本科研业务费(CDJXS10141147)

摘　　要：以碱金属钠为工质,通过建立轴对称恒温相变模型,对基于碱金属热电转换器(AMTEC)太阳能热发电的带插管毛细芯蒸发器性能进行数值模拟,分析插管的长度、管径和热阻等参数对毛细多孔芯及液体通道内压力、速度和温度分布的影响。结果表明:将插管插入蒸发器液体通道中,可改善毛细芯蒸发器的工作性能,不仅可使多孔吸液芯内表面温度更加均匀,而且可降低多孔吸液芯内表面的最高温度;不同工况具有不同的最适宜插管结构。Using sodium as the medium and setting up an axial symmetric invariable temperature phase change in- terface model, the numerical study of flow and heat transfer characteristics in improved capillary porous wick evapo- rator for alkali metal thermal-to-electric converter （AMTEC） solar thermal power generation was presented for dif- ferent bayonet tube parameters in order to investigate the influence of length, diameter, and thermal resistance of the bayonet tube on the distributions of pressure, velocity and temperature in capillary porous wick and liquid chan- nel. The results show that the bayonet tube plays a significant role in the performance improvement of capillary por- ous wick evaporator. The bayonet tube can not only make the surface temperature inside the capillary porous wick be uniform, but also reduce the peak surface temperature. The optimal bayonet tube parameters depend on various working conditions of capillary porous wick evaporator.

关 键 词：太阳能热发电 碱金属热电转换器(AMTEC) 插管 毛细多孔芯 热质传输 数值模拟 

分 类 号：TK514[动力工程及工程热物理—热能工程]