低温泵内空化流动演化规律的数值仿真  

Numerical simulation of cavitation flow evolution law in cryogenic pump

作　　者：程文洁[1] 张飞宇 Cheng Wenjie;Zhang Feiyu(College of Mechanical and Power Engineering,Nanjing Tech University,Nanjing 211816,China)

机构地区：[1]南京工业大学机械与动力工程学院,南京211816

出　　处：《低温与超导》2021年第8期78-81,92,共5页Cryogenics and Superconductivity

基　　金：江苏省高等教育教改研究立项重点课题(2019JSJG024)资助。

摘　　要：为了研究低温泵内的空化流动对泵效率的影响,采用SST k-ω湍流模型和Zwart空化模型对泵内空化流动进行数值模拟分析。结果表明:随着泵入口压力不断降低,叶轮入口处空泡越来越明显;空泡较明显的叶轮流道出口处形成较集中的高温区;当泵入口压力较高时,不同介质温度的泵效率均略有下降且斜率相近;当泵入口压力较低时,不同温度下液氮对应的泵效率曲线斜率有一定差异,温度越高,效率下降越快。这些研究的发现可以为低温泵性能的改善提供一定的参考。In order to study the influence of cavitation flow in cryogenic pumps on pump efficiency, the SST k-ω turbulence model and Zwart cavitation model were used to numerically simulate the cavitation flow in the pump. The results show that with the continuous decrease of the pump inlet pressure, the cavitation at the impeller inlet becomes more and more obvious;the more concentrated high temperature zone is formed at the outlet of the impeller passage where the cavitation is more obvious. When the pump inlet pressure is high, the pump efficiency with different medium temperatures decreases slightly and the slopes are similar. When the inlet pressure of the pump is low, the slope of the pump efficiency curve corresponding to the liquid nitrogen at different temperatures has a certain difference. The higher the temperature, the faster the efficiency drops. The findings of these studies can provide a certain reference for the improvement of cryopump performance.

关 键 词：低温泵 空化 泵入口压力 

分 类 号：TH311[机械工程—机械制造及自动化]