Abstract：Aiming at the technical defects of calculation efficiency and discretization accuracy in the numerical simulation of internal flow in centrifugal pumps by using unstructured tetrahedral mesh, the flow field within a XA65/20 single-stage and single-suction centrifugal pump under design and off-design conditions was simulated with the software Ansys Fluent 13.0 using polyhedral mesh generated by agglomeration multi-grid method and unstructured tetrahedral mesh. The static pressure, velocity and turbulent kinetic energy distribution of the interior flow field were obtained and analyzed. In addition, the performance of the model pump was experimentally studied, both the head and efficiency of the pump predicted numerically were compared. The results show that the calculation based on polyhedral mesh has higher convergence speed, smoother residual curves and lower computer memory requirement. The pressure cloud and turbulent kinetic energy distribution are more uniform. The comparison between numerical and experimental results verifies the feasibility and accuracy of polyhedral mesh. In the angles of mesh setup time, computational expense and numerical diffusion, polyhedral mesh can be applied in the numerical simulation of internal flow in centrifugal pumps.
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