Cavitation and cavitation erosion characteristics in pump based on cavitation bubble collapse energy
Aiming at the cavitating flow characteristics and cavitation erosion problems in a double suc-tion centrifugal pump,the characteristics of cavitation and the cavitation erosion were investigated based on the multiphase cavitation model and cavitation bubble collapse energy.Using the Volume of Fluid(VOF)method combined with the Schnerr-Sauer cavitation model,and the unsteady RNG k-εturbulence model,the simulation of the cavitating flow field in the double suction pump was carried out.On this basis,a cavitation erosion risk assessment method was established based on the cavitation bubble collaspe energy,and the cavitation erosion risk area in the pump was predicted.Finally,based on the entropy production analysis,the energy loss characteristics in the pump caused by cavitation and the relationship between energy loss and cavitation were analyzed.The results show that the numerical model can accurately predict the pump head and its change with the cavitation,as well as the cavita-ting flow characteristics in the impeller channel.The cavitation erosion risk prediction results show that the cavitation erosion is mainly distributed in the impeller suction surface and the front cover of the im-peller,which located at the cavitation tail.Moreover,the risk of cavitation erosion on the blade surface is higher than that on the front cover.The energy loss in the pump is closely related to the cavitation and the maximum energy loss in a cycle occurs when the cavitation bubble collapses.
万方数据
维普
