In order to study the effect of impeller clocking position in multistage centrifugal pumps on the fluid-induced vibration,the structural dynamic response of the pump casing under fluid excitation was analyzed based on the combination of CFD and FEMmethods.The simulation results indicate that the impeller clocking position has no influence on the frequency,amplitude and phase of the pressure pulsation in the first stage.The frequency of the pressure fluctuation in the second stage is also independent of the clocking position,and the amplitude increases slightly with the clocking position variation;however,the phase changes significantly with the change of clocking position.When the clocking angle is just half the blade angle,the phase of the pressure pulsation in the second stage is shifted by 90 degrees compared with the pressure fluctuation in the first stage.As such,the direction of the pressure pulsation in the second stage is opposite to that in the first stage.This leads to a reduction of axial flow excitation and an opposite component of axial vibration,making the overall vibration level drop obviously.%为研究节段式多级离心泵叶轮时序位置对流致振动的影响，结合 CFD ＼FEM方法对考虑叶轮交错角度的泵体在水力激励作用下结构的动力响应进行了计算分析。结果表明，首级内压力脉动的频率、幅值和相位不受叶轮时序位置的影响；次级内压力脉动的频率同样没有发生明显变化，幅值随着时序角度的增大有微小增幅，而相位随着时序角度的改变发生明显变化。当时序角度刚好为叶轮叶片角度的一半时，次级转子内压力脉动相位刚好与首级错开90°，压力脉动方向与首级相反，导致轴向的激励减小，轴向振动存在相反的量，使得泵整体振动水平明显下降。
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