分流叶片对离心泵径向力特性的影响

Effects of Splitter Blades on the Radial Force in a Centrifugal Pump

为了分析有/无分流叶片、分流叶片进口直径以及分流叶片周向偏置度对离心泵径向力特性的影响,设计了5个具有不同分流叶片的叶轮,并采用ANSYS-CFX软件对各方案进行三维全流场非定常数值模拟。通过非定常数值模拟获得了作用在不同方案叶轮上的径向力特性,并对其进行比较分析。结果表明:分流叶片有利于减小作用在叶轮上的径向力,并有效改善径向力的脉动情况;小流量及设计工况下,作用在叶轮上的径向力及其脉动幅值随着分流叶片进口直径的增大而增大;大流量工况下,当分流叶片进口直径为106mm时,作用在叶轮上的径向力脉动幅值最小;非设计工况下,带偏置分流叶片设计方案的径向力脉动幅值小于带不偏置分流叶片设计方案。

To analyze the effects of different design parameters of splitter blades on the radial force in a centrifugal pump,the three-dimensional full unsteady flow fields of impellers with different splitter blade parameters were simulated byusing ANSYS-CFX.The results show that,when adding splitter blades,the radial force and the amplitude of radial force fluctuations on the impeller reduced.And different design parameters of splitter blades have a certain effect on the radial force on the impeller.The radial force and the amplitude of radial force fluctuations are increase as the splitter blade inlet diameter increases at low flow rate condition and design condition.However,at large flow rate condition,the amplitude of radial force fluctuations of the impeller with 106mm splitter blade inlet diameter is lowest.And the amplitudes of radial force fluctuations of the impeller with deviated splitter blades are smaller compared with the impeller with no-deviated splitter blades at off-design conditions.