Abstract：In order to improve the matching between the guide vanes and impellers of the axial-flow pumps, a vertical axial-flow pump was taken as the research object. The guide vane of the hydraulic models were modified by an orthogonal experiments. The hydraulic models of axial-flow pumps with different guide blades were compared and optimized by using computational fluid dynamics software(CFD)and model tests. The results show that the maximum error between the numerical calculation results and the model test results is less than 5%. The overall trend of the performance curve is relatively good. The numerical calculation method is reasonable and reliable. Under the design flow condition, the optimized guide vane can reduce the hydraulic loss of the guide vane body and the outlet circulation of the guide vane, and the kinetic energy recovery effect is better. It can effectively reduce the design head and ensure the efficient operation of the pump station with 80.7% efficiency. Different guide vanes have a significant impact on the performance of the vertical axial flow pump device. The optimized guide vanes can change the design flow rate of the device, so that the efficient area of the device is biased towards large flow rate. Simultaneously increase the device head of the pump under small flow conditions and reduce the device head under large flow conditions.
