液环泵内部气液两相流动及其性能分析

为改善液环泵水力性能,采用VOF气液两相流动模型对液环真空泵内部三维非稳态气液两相流动进行数值模拟。通过数值模拟分析叶轮及泵腔内的流线分布、速度分布、相态分布及压力分布规律,对泵内复杂的二次流进行了分析,对液环真空泵工作过程中泵内气液两相流的自由分界面进行追踪,并分析了泵内气液两相流自由分界面的变化规律及其与泵外特性的关系。对液环泵进行试验研究,模拟结果与试验结果进行对比分析表明,数值方法结果与试验结果基本一致,能够较准确地描述液环泵内气液两相流流动规律,捕捉气液分界面,预估液环泵的水力性能,为液环泵的性能优化研究提供了依据。

Investigation on Inner Gas-liquid Flow and Performance of Liquid-ring Pump

With the aim to improve the hydraulic performance of liquid-ring pump, the three dimensional transient gas-liquid flow in liquid-ring pump was simulated by using the volume of fluid (VOF) method. The streamline, the distribution of velocity, press and the volume fraction were investigated. The secondary flow in pump was analyzed. The free interface of gas and liquid phase in pump was traced, and the relation between the shape of the free interface and the hydraulic performance of the pump was analyzed. The experimental research was carried out. The numerical results and the experimental results show good agreement. The numerical method of VOF is suitable for simulating the gas-liquid flow in liquid-ring pump. The free interface could be traced exactly and the hydraulic performance could be evaluated with enough accuracy, which pave the way for hydraulic optimization of liquid-ring pump.