Numerical simulation of air entrainment and suppression in pump sump  

作　　者：QIAN Zhong Dong WU Peng Fei GUO Zhi Wei HUAI Wen Xin 

机构地区：[1]State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University

出　　处：《Science China(Technological Sciences)》2016年第12期1847-1855,共9页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.51422906)

摘　　要：The dynamics of air entrainment and suppression schemes in a pump sump are investigated. Four different turbulence models(standard k-ε model, realizable k-ε model, renormalization group(RNG) k-ε model and shear-stress transport(SST) k-ω model) and the volume of fluid(VOF) multiphase model are employed to simulate the three-dimensional unsteady turbulent flow in a pump sump. The dynamic processes of air entrainment are simulated under conditions of relatively high discharge and low submergence; the mechanism of air entrainment is discussed in detail. Then suppression means for air entrainment is adopted by placing a circular plate on the intake pipe at three different heights. The results show: the position and structure of the free-surface vortices, sidewall-attached vortices, back wall-attached vortices, and floor-attached vortices calculated by SST k-ω turbulence model agree well with the experimental data. The two main contributors for air entrainment are pressure difference and vortex strength. By placing a circular plate in the middle of the intake pipe under water, air entrainment is suppressed because vortex strength is reduced.

关 键 词：air entrainment suppression schemes pump sump VOF 

分 类 号：O357.5[理学—流体力学] P642.26[理学—力学]