离心泵非定常计算中叶轮转动位置对性能影响的数值模拟

A Numerical Simulation of Effect on the Performance of Impeller Position in the Unsteady Calculation of Centrifugal Pumps

利用CFD软件,采用Realizable k-ε湍流模型,分别在3种工况下,对1台比转数为71的导叶-蜗壳组合式离心泵的内部流动进行三维非定常数值模拟,获取了离心泵内部流场结构,计算泵的扬程及效率。根据计算结果,分析了叶轮转动位置对泵外特性和内流场的影响。结果表明:当叶轮转动位置不同时,泵扬程、效率随之发生变化,选取某一特定位置处结果作为最终预测结果会产生较大的随机误差;叶轮转动位置的不同,也会对叶轮、导叶、蜗壳流道内的压力场和速度场产生一定的影响。

Full three-dimensional numerical simulation of a volute-diffuser combined centrifugal pump are carried out by using CFD under 3 operating conditions.The Reynolds-averaged Navier-Stokes equations are solved with a turbulence model of Realizable k-ε.The flow pattern is obtained.The head and hydraulic efficiency of the pump are calculated.Based on these,an analysis is made of the effect of impeller rotating position.The results show that： The head and efficiency will change periodically along with the impeller rotating position,so selecting a specific location result as the final predicted result will have a greater random error.The pressure filed and velocity field of the impeller,diffuser and volute will also have some impact on the impeller rotating position.