In order to solve the problem of poor hydraulic performance of traditional centrifugal pump in operation,computational fluid dynamics ( CFD) technology was used to optimize the volute structure pa-rameters of IS80-50-250 clean water pump.The orthogonal test scheme was made by selecting four struc-tural parameters:the diameter of the volute base circle,the volute inlet width,the eighth section radius of the volute and the placement angle of the tongue.The numerical simulation of each scheme was carried out by using Pumplinx software,and the distribution law of internal flow field of centrifugal pump was ob-tained.The simulation results showed that compared with the prototype pump,the outlet pressure of the optimized pump was increased by 3.27％ and the steam mass fraction was reduced by 10.47％ at the ra-ted speed,which improved the hydraulic performance of the centrifugal pump.To verify the accuracy of the optimization scheme,the centrifugal pump external characteristic test bench was built,and the external characteristic curves of the prototype pump and the optimized pump under different working conditions were obtained.The test results showed that the head and efficiency of the centrifugal pump were increased by 4.43％ and 4.44％ respectively under the rated working conditions,which further verified the accura-cy and feasibility of the orthogonal test optimization scheme,and provided a technical basis for the next step of high-performance centrifugal pump design.
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