Numerical Simulation Of Three-Dimension Flow Fields In The Centrifugal Pump

In recent years, with the development of Computational Fluid Dynamics (CFD) it has become an important research direction to use CFD to study the flow mechanism in centrifugal pump and then optimize the design with simulation results.On the basis of Computational Fluid Dynamics theory and previous experience, the numerical simulation of the internal flow in centrifugal pump is carried out by using FLUENT software. We analyze the velocity distribution and pressure distribution, and then reveal the internal flow law of centrifugal pump. It provides reference data for optimal design of centrifugal pump. In order to improve the hydraulic performance of centrifugal pump, we use the short blade offset design method to improve centrifugal pump and then analyze its internal flow distribution. We find that short blade offset method is favourable to the distribution uniformity of velocity and pressure, reducing the pressure fluctuations of impeller outlet and shock loss. The flow is improved markedly. Calculating pressure head and hydraulic efficiency of the improved centrifugal pump and comparing with prototype centrifugal pump's, we find that its pressure head and hydraulic efficiency are increased by 3.64% and 1.7%. It can be seen that using short blade offset design method to improve the centrifugal pump performance is correct and feasible.This study accumulates the experience of using CFD software to research fluid flow problems; opens a new way for people to understand and master the 3D complex internal flow of centrifugal pump; lays the theoretical foundation for structure optimization and hydraulic performance improvement; provides reference for probing into a new design method of centrifugal pump.