In order to improve hydrodynamic performance of mixed-flow pump, numerical research on some factors influencing hydrodynamic performance of mixed-flow pump were carried out. The factors were the tip clearance, the rotor blade number, the rotor blade angle, the roughness, the rotor blade thickness. Internal flow field of mixed-flow pump, which was meshed by structured grids, was simulated at multi conditions by solving Reynolds-Averaged Navier-Stokes equations and shear stress transport turbulence model with multiple-reference- frame approach. The results show that the head, power and efficiency all decline with the tip clearance enhancing. The maximum efficiency can be elevated and the high efficiency zone can be enlarged by adjusting the rotor blade angle. The head and power increase with the rotor blade number increasing, but the head increasing amplitude is gradually smaller with the rotor blade number increasing. It's unfavorable as the rotor blade number too many or too few. The efficiency declines significantly with the roughness increasing. When the rotor blade become thinner, the maximum efficiency point moves to a little larger mass-flow-rate point, and a slightly increased efficiency value was gained. On premise of satisfying produce and installation requirements, optimal choices of these factors can greatly improve hydrodynamic performance of mixed-flow pump.
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