Design Method for Impeller of Centrifugal Pump With Guide Vanes Based on Oseen Vortex

Abstract

Centrifugal pumps with guide vanes (GVs) are widely used in a pump as turbine, energy storage pump station, and water diversion project. The objective of this study is to establish a design method of centrifugal pumps for matching impeller outlet and diffuser inlet to reduce hydraulic loss. To this end, a theoretical prediction model based on the fluid governing equation and the Oseen vortex model is proposed to predict the velocity moment downstream the impeller of the centrifugal pump. Then, a design method is established to design the impeller of the centrifugal pump with guide vanes. A centrifugal pump with a specific speed of 127 is used to validate the theoretical prediction model, and results of velocity moment show that the deviation between predicted and simulated results is below 0.5% in average. Finally, the design method is applied, and results show that the average efficiency of redesigned pump under the working conditions is 1.04% higher than that of baseline pump, which validates the reliability of proposed design method by theoretical prediction based on Oseen vortex. Analysis on velocity distribution and turbulence eddy dissipation shows that the design method based on Oseen vortex can effectively improve the flow pattern and pump performance.