立式低温容器真空丧失热分层现象数值模拟研究  

Numerical simulation of temperature stratification in a multilayer insulated vertical vessel at loss of vacuum

作　　者：鞠鹏[1] 李祥东[1] 杨磊[1] 汪荣顺[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《低温与超导》2008年第6期16-21,共6页Cryogenics and Superconductivity

基　　金：中国博士后科学基金项目(20070410722)资助

摘　　要：对立式低温容器在真空丧失条件下的内部热分层现象进行了分析,采用双流体模型结合CFD求解器计算了立式低温容器内的流动及传热过程,考察了侧壁及底部热通量对液体热分层现象的影响。结果表明:侧壁热通量较底部热通量更易使容器内部产生热分层;容器内部形成的环流及其成长是导致热分层及温度突跳的根本原因。In this paper, analysis is carried out on the temperature stratification of cryogenic liquid in a multilayer insulated vessel at loss of vacuum. The flow and heat transfer of cryogenic liquid in the vessel are simulated using a two - fluid model incorporated in the CFD solver. The impact of heat flux at the wall and the bottom of the vessel on the liquid temperature stratification is compared. The results illustrate that： Compared with the heat flux from the bottom of the vessel, heat flux from the wall has stronger effects on the temperature stratification; Besides, the circumfluence of liquid and its growth in the vessel is the reason of temperature stratification and temperature jump.

关 键 词：真空丧失 温度分层 数值模拟 双流体模型 温度突跳 

分 类 号：TB657.9[一般工业技术—制冷工程] TK264.11[动力工程及工程热物理—动力机械及工程]