Research on the Influence of Grid Division on the Hydraulic Performance Calculation Accuracy of Multistage Centrifugal Pump

In order to improve the calculation accuracy of the hydraulic performance of multistage centrifugal pump under multiple working conditions, the calculation domain was divided into tetrahedral, mixed and hexahedral grids respectively. RNG κ-ε turbulence model was used for numerical calculation and compared with the test results. The influence of grid division on the calculation accuracy was comprehensively evaluated from the coincidence of the calculation curve and the test curve. The results show that the comprehensive calculation accuracy of hybrid and hexahedral grid schemes is higher than that of tetrahedral grid under multi-working conditions; the comprehensive calculation accuracy of hexahedral grid is significantly better than that of hybrid grid type, especially that the maximum relative calculation error of performance parameters under multi working conditions is less than 2.44%, and the efficiency calculation curve and test curve are in good agreement. In general, hexahedral grid is suitable for the prediction of the hydraulic performance of multistage centrifugal pump.