基于CFD的离心泵叶轮内部流动分析与试验对比

Internal Flow Analysis and Experimental Comparison of Centrifugal Pump's Impeller Based on CFD

为了解有空间导叶的离心泵叶轮内部水力性能,借助NUMECA公司的FINE软件,采用NavierStokes方程和Spalart-Allmaras湍流模型,分别在0.8Qopt、Qopt、1.2Qopt工况下对离心泵内部流动进行数值模拟计算。结果表明,随流量的增加,靠近进口边叶片吸力面的抗空蚀性能逐渐增强;叶片间轴向漩涡的位置与流量无关;出口边径向速度随流量增加而增大;出口边切向速度随流量增加而减小。与试验结果的比较表明,在Qopt工况下,数值模拟能有效预测泵内部的复杂三维流动与水力性能。

In order to explore the hydraulic performance of centrifugal pump impeller with spatial guide vanes, by using the FINE software developed by NUMECA Company, the Navier Stokes equations and Spalart Allmaras turbulent model were used to numerically calculate the internal flow of a centrifugal pump under three operating conditions of 0.8 Qopt, Qopt, 1.2Qopt. The analysis shows that the cavitation erosion resistance of the blade suction side close to inlet side gradually increases with increasing of discharge; the position of axial vortex between vanes has nothing to do with discharge; the radial velocity of outlet side gradually increases with increasing of discharge; the tangential velocity of outlet side gradually decreases with increasing of discharge. Compared with the test results, it is obvious that this numerical simulation can accurately predicate the complicated three dimensional flow and the hydraulic performance of the pump under operating condition of Qopt.