Abstract：Two impellers, in which the blade trailing edge is with different oblique angles but the blade angle profile remains unchanged, were designed for a centrifugal pump to study the pressure fluctuation features caused from the impellervolute interaction. The unsteady, threedimensional turbulent flow in the pump was simulated by using the SST turbulence model, SIMPLEC algorithm and sliding mesh technique in this paper. Then the performance and pressure fluctuations in centrifugal pumps with those impellers were obtained. It was demonstrated that the pump keeps a relative higher efficiency in an extended flow rate range with decreasing oblique angle; additionally, the pump heads are close to each other for the two impellers at the partloading and design conditions, however, the heads increase at high flow rates. The periodic features in pressure fluctuation are the same for the two impellers, however, the amplitude of the fluctuation and highfrequency components are reduced in the volute and near its tongue. These results can provide a useful reference for the design of centrifugal pump impeller.
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