In order to research the fluid-induced force of centrifugal pump impeller with compound whirling, based on the N-S equations, the RNG k-ε turbulence model is applied to simulate the low specific speed centrifugal pump under eccentric assembly condition. The effects of different flow rates, impeller eccentricities and whirl ratios on the fluid-induced force of impeller were investigated. Finally, the fitting models of fluid-induced force with compound whirl were obtained by least square method (LSM). The results imply that the calculated results considering the impeller eccentricity are closer to the experimental data than those without considering the eccentric whirl. In addition, the extremum value of fluid-induced force of impeller has a significant positive correlation with the impeller eccentricity. With the increase of flow rate, the fluid-induced force is non-monotonic. The whirl ratio can change the numbers of peak and valley of fluid-induced force, and the nonlinear fitting model of fluid-induced force using LSM presents high precision. This study can provide important references for the design and fluid-structure interaction (FSI) vibration of centrifugal pump.

为了研究复合回旋的离心泵叶轮的流体动力，基于NS方程，RNGk -ε采用湍流模型对偏心组装条件下的低比转速离心泵进行了仿真。研究了不同流量，叶轮偏心率和涡流比对叶轮流体感应力的影响。最后，通过最小二乘法（LSM）获得了带有复合涡流的流体诱导力的拟合模型。结果表明，考虑叶轮偏心率的计算结果比不考虑偏心涡流的计算结果更接近于实验数据。另外，叶轮的流体作用力的极值与叶轮的偏心率具有显着的正相关。随着流量的增加，流体引起的力是非单调的。涡流比可以改变流体感应力的峰值和谷值，基于LSM的流体动力非线性拟合模型具有较高的精度。该研究可为离心泵的设计和流固耦合振动提供重要参考。