基于CFD的离心泵轴向力计算与试验

Estimation and Experiment of Axial Thrust in Centrifugal Pump Based on CFD

离心泵特别是高压多级泵的设计中,轴向力的预测是一个关键的问题。现有的2种轴向力预测方法,试验测量耗费时间和财力,而采用经验公式计算,其精度及适用性又较差。本文以CFD技术为基础,对一台井用潜水泵内部流场进行数值模拟,得到泵轴轴端及叶轮表面的压力分布,从而预测出泵的轴向力。对泵样机进行轴向力试验,得到其全工况下的轴向力分布。比较泵主要工况下预测值与试验值,结果较为一致,且预测值最大误差小于10%。

The forecast of axial thrust is a pivotal problem in the design of centrifugal pumps, especially in multistage pumps. The existing axial thrust predict methods always cost too much time and resource in experiment; the experiential formula has lower precision and narrow application range. Through the numerical simulation of the internal flow field of deep well pump, this paper obtained the pressure distribution of the pump axial end-face and the impeller surface, and the axial thrust was estimated accordingly. In order to obtain the axial thrust distribution in full condition, the experiment for the pump axial thrust was conducted. Estimated results are closely matched with the experimental results, and the maximum error is less than 10 %.