Non-Smooth Surface Flow Drag Reduction Characteristics of Centrifugal Pump Impeller

摘要

In order to improve the efficiency of centrifugal pump, based on the bionics principle, non-smooth surfaces of various groove structure on the centrifugal pump impeller were established. The internal flow field of it was numerically simulated by RNG k-ε turbulence model. Research the drag reduction characteristics of non-smooth impeller with different groove shape and arrangement. The results showed that the maximum drag reduction rate of centrifugal pump with non-smooth blades is about 6.22%. The blades of non-smooth unit can effectively inhibit the near wall boundary layer flow state, reduce the shear stress on blades wall, and the internal fluid turbulent degree of centrifugal pump, so that the fluid flow in centrifugal pump impeller is more stable, improving the efficiency of centrifugal pump.