多级离心泵流场优化及验证

流体激励力是离心泵主要振源之一。通过对离心泵流场进行优化，可有效降低泵组流体激励力，减小离心泵振动。以多级离心泵的减振降噪为研究目的，运用CFD仿真技术从切割叶轮及改变蜗壳形状两个方面对流场进行优化。通过对比优化前后压力脉动以及流场激励力变化，说明优化情况。最后考虑加工工艺要求，选择切割叶轮的优化方法，并通过机脚振动响应的变化间接验证改善效果。结果表明：切割叶轮与改变隔舌形状对离心泵叶频及其倍频下的压力脉动与流体激励力都有减小，切割叶轮后机脚响应降低了4 dB。

Flow Field Optimization and Experimental Verification ofMulti-stage Centrifugal Pumps

Fluid exciting forces are one of the important vibration sources of centrifugal pump which transmit outward through the pump shell and bearings. So flow field optimization can effectively reduce fluid exciting forces and vibration sources to improve the centrifugal pump vibration characteristic. This paper aimed to decrease vibration and noise of multi-stage centrifugal pump. To begin with, CFD simulation technology was applied to optimize the flow field of the pump from cutting impeller and changing shape of the volute. Then the pressure pulsations and flow field excitation forces, before and after the optimization, were compared and analyzed. After that, the best method of cutting impeller was selected considering the requirements of processing technology. Finally the effectiveness was indirectly verified by analyzing the change of seat vibration response. The results show that: cutting impeller and changing the tongue shape can improve the pressure pulsation and fluid exciting force of the pump under blade frequency and its frequency doubling to some extent, and the seat vibration response after cutting reduces by 4dB.