两段变曲率叶型离心泵流场数值模拟

Numerical Simulation of Interflow Field in Centrifugal Pump with Double Curvature Blade

采用CFD技术对两段变曲率叶型离心泵内部流动进行定常和非定常三维数值模拟,并和设计参数相同的普通叶型离心泵进行对比,得到内部流场特征及监测点的压力脉动情况。结果表明,两段变曲率叶型离心泵可以很好地防止叶轮内尾流的产生和发展。叶轮与隔舌间的动静干涉是产生泵压力脉动的主要脉动源,且流量越大,隔舌处压力脉动越大。同一流量下,两段变曲率叶型离心泵的压力脉动幅值比普通离心泵小,在一定程度上减小了泵的水力损失。

The steady and unsteady interflow fields in centrifugal pump with double curvature blade were investigated by CFD,which was compared with general centrifugal pump in the same design parameters.The characteristic of interflow fields and pressure fluctuations at different monitoring points were obtained.The results showed that it can prevent the impeller from emerging and developing wake flow in double curvature blade centrifugal pump.The main factor which created the pressure fluctuation in the pump was the interaction between the impeller and the tongue,and with the flow rate increased,the pressure fluctuations at the tongue were getting bigger.At the same flow rate,the pressure fluctuation＇s amplitude value on double curvature blade type centrifugal pump was smaller than the ordinary centrifugal pump,which reduced the pump＇s hydraulic loss to some extent.The results are served as the theory basis in optimization of pump structure and reduction of pump＇s noise and vibration.