超低比转数离心泵叶轮切割的三维流场数值模拟

Impeller Trim of Super-low Specific Speed Centrifugal Pump Based on Numerical Simulation of 3D Flow Field

为研究超低比转数离心泵叶轮直径切割量与泵性能变化的关系,选取IS 50-32-250型离心泵为研究对象,利用商业软件Fluent对不同叶轮外径下泵的三维流场进行数值模拟,计算出不同叶轮切割量下的叶轮和泵体流场中压力场和速度场的分布。通过对不同叶轮切割量的计算结果分析比较,得出超低比转数离心泵叶轮切割量对泵的效率产生很大影响:叶轮切割量为0.03时,泵的效率突然升高;切割量为0.09时,效率稍有下降;切割量为0.15时,效率突然产生大幅度下降。实际切割中切割量不能大于0.15,否则性能严重下降。

In order to research the relationship between the size of impeller cutting of super-low specific speed centrifugal pump and the changing pump performance,centrifugal pump IS 50-32-250 was chosen as the research object.By using commercial software Fluent to conduct numerical simulation of three-dimensional flow field,the distributions of pressure and velocity in the impellers and pump bodies under different impeller diameters were calculated.By comparison of calculated results of different diameters,the influence of the size of impeller cutting on pump performance was obtained： when the size of impeller cutting was 0.03,the efficiency raised suddenly;when the size of impeller cutting was 0.09,the efficiency decreased slightly;when the size of impeller cutting was 0.15,the efficiency sudden dropped dramatically.The size of impeller cutting could not be bigger than 0.15 in the practical application,otherwise,the performance of pump dropped dramatically.