Research on the effect of anti-guide vane inlet Angle on the performance of multistage centrifugal pump

Abstract Anti-guide vane is the component that converts energy and diversion flow in multistage centrifugal pump and its hydraulic loss is the main factor affecting pump performance. In this paper, the multistage centrifugal pump with radial guide vane is taken as the research object. Based on α5 =35° inlet angle of prototype anti-guide vane, two optimization schemes of reducing and increasing the inlet angle are proposed to obtain α5′=25° and α5′′=45°. The SST turbulence model is used to simulate the centrifugal pump before and after optimization. The internal flow velocity characteristics, blade load distribution and pressure pulsation characteristics of the multistage centrifugal pump anti-guide vane were studied. The results show that under large flow conditions, the pump head and efficiency are increased by 4% and 2.66% respectively. And the flow loss in the anti-guide vane is reduced by 6.02%, which greatly improves the unstable flow caused by the impact separation at the anti-guide vane inlet. The blade load increases with the decrease of the anti-guide vane inlet angle, and the pressurization benefit of anti-guide vane is the largest when α5′=25°. The vibration amplitude of pressure pulsation is the largest at the anti-guide vane outlet, and the amplitude increases with the decrease of inlet angle. The research results can provide reference for the optimal design of the multistage centrifugal pumps anti-guide vane.