Effect of Bionic Blade with Micro-pitted Surface on the Cavitation Properties of Centrifugal Pump
Cavitation phenomenon is a key factor affecting the performance of centrifugal pump,in order to study the effect of bionic microstructure on the cavitation performance of centrifugal pump.Taking the centrifugal pumps with a specific rotational speed of 112.4 as the research object,a class of mushroom-like pit microstructure blade is proposed based on the gas-entrapping microtextured surfaces of sea skaters.Numerical simulations of non-stationary cavitation is carried out on the model using CFD simulation software to study the effect of different pit depth ratios of the microstructure on the cavitation properties of centrifugal pump.The finding indicate that the bionic microstructure exerts a negligible influence on the hydraulic performance of centrifugal pump,with a marginal change of head:-1.42%~1.38%.Different depth ratios have a greater effect on the cavitation properties of centrifugal pump,when the depth ratio is 2.5,the best effect of inhibiting cavitation,the volume of vacuole in the incipient stage of cavitation is reduced by 54.75%,and the fracture head is increased by 17.07 m.The arrangement of bionic mushroom-like pits in front of the suction front at the first 1/3,reduces the distribution of low-pressure zone at the impeller inlet,reduces the cross-sectional area of the vacuole in the flow channel,and inhibits the incipient and development.