本文以一六级多级离心泵为模型，设计A、B、C、D四组不同的交错方案，A为叶轮相位不交错、 B为叶轮相位交错一个流道相位的1/2、C为叶轮相位交错一个流道的1/(Z-1)、D为叶轮相位交错一个导叶流道的1/(Z-1)(其中Z叶轮为叶片数)。通过四组方案对多级离心泵的三维全流场进行数值分析，得到不同叶轮交错方案在不同工况条件下流场对机械部件的荷载变化。分析结果表明：叶轮相位交错使转子的径向力矢量分布向轴心集中；叶轮相位交错结构可以有效地减小转子受到的径向力，使转子运行稳定性得到提高；叶轮相位交错会造成不同工况下的转子受力波动幅值和成分发生改变；在设计工况下数值计算轴向力绝对值要高于理论计算的结果

The parameters of multistage centrifugal pump: H=2160m, Q=600m3/h, n=5410r/min. Four different phase staggered schemes are designed. Through four different scheme of multistage centrifugal pump of the three dimensional flow field in numerical analysis, and the stress distribution of multistage centrifugal pump rotor was analyzed. The load variation of the flow field on the mechanical components under different phase staggered schemes and working conditions is studied. Analysis results show that phase stagger to the axis of the rotor radial force vector distribution. Phase stagger to the axis of the rotor radial force vector distribution. The phase staggered structure can effectively reduce rotor radial force. At 0.6Qd, the axial force fluctuation of A, C and D are mainly based on the low frequency and the one times of leaf frequency fluctuation. The scheme B is mainly based on low frequency fluctuation. At 1.0Qd, the four scheme of the fluctuation is obvious, and the change trend is similar. The B and C axial force fluctuation amplitude is relatively smaller, and the frequency is one times of the frequency. At 1.4Qd, the four schemes have obvious fluctuation, the axial force change amplitude were similar, and with a lot of high frequency fluctuations. The absolute value of axial force is higher than that of theoretical calculation under design condition. Due to the simplification of the parameters in the theoretical calculation and the approximate calculation, so the results and results of the numerical calculation have certain error.

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国家自然科学基金资助项目(51279172)；四川省教育厅重大培育项目(14CZ0013)；西华大学流体及动力机械教育部重点实验室开放研究基金资助项目(szjj2015-037)