Volute centrifugal pump is the core equipment for fluid transportation.The pressure pulsation and hydraulic performance have a significant impact on the stability,noise and life of the pump.Combined with the design method of curvature control leading edge,as the growth rate of 1.19％,0.47％and 0.32％,volute centrifugal pumps with the leading edge axis ratio of 0.96,2.11,3.11 and 4.11 were established.Taking the steady calculation results of SST K-C model as the initial condition,the unsteady analysis of K-e RNG model was carried out.The pressure pulsation was analyzed by frequency domain diagram,and the hydraulic performance was ana-lyzed by vector cloud image.The results show that the optimal flow rate of the designed model is 35 m3/h,and the error between design efficiency and simulation efficiency is only 2％;the axial length ratio of the leading edge is different,and the pressure diffusion in the flow channel is different;when the axis ratio of the leading edge is 3.11,the outlet pressure pulsation is low,and the pressure pulsation is more likely to occur in the low frequency region;when the axis ratio of the leading edge is 0.96,the pressure fluctuation range is small,which is suitable for the working condition with large head change in a certain flow range.
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