短叶片长度对固液离心泵内流场影响的模拟研究

为了研究短叶片长度对长短叶片离心泵叶轮内固液两相流场的影响,应用CFD软件对5种不同短叶片长度的离心泵中的固液两相流场进行数值模拟,分析并对比5种离心泵中压力及固相体积浓度变化规律.结果显示:5种离心泵中的压力沿着半径增大方向呈增大趋势;且相同半径处,工作面压力总是大于吸力面;在一定程度上减小短叶片长度,压力分布更均匀,颗粒浓度的变化曲线更平缓,同时叶轮中固相颗粒的高浓度区域大大减小,从而能够减弱各种不稳定因素的影响,保持良好的流动状态,提高离心泵的水力性能和抗磨损性能.所得结论为离心泵的改良和设计提供非常有价值的理论基础.

Simulation Study on the Effect of Short Vanes' Length on Solid-Liquid Two-Phase Flow Field in Centrifugal Pump

In order to study the effect of the short vanes' length on the solid-liquid two-phase flow field in the centrifugal pump with long and short vanes,the CFD software is used to simulate the solid-liquid two-phase flow field in the five kinds of centrifugal pumps with different short vanes' length.The pressure and particle distribution of the five kinds of centrifugal pumps are compared and analyzed.The results show that the pressure of the five kinds of centrifugal pumps increases with the radius increasing,and at the same radius,the pressure of the working face is always larger than the non-working face.The pressure and particle density distribution are more uniform with the reducing of the short vanes' length appropriately,so that the unstable factors are weaken greatly,the flow condition is better,and the performance of anti-wear is improved significantly.The conclusion could provide important theoretical basis for the improvement and design of centrifugal pumps.