Numerical simulation of air entrainment and suppression in pump sump

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• 作者：ZhongDong Qian ; PengFei Wu ; ZhiWei Guo ; WenXin Huai
• 关键词：air entrainment ; suppression schemes ; pump sump ; VOF
• 刊名：Science China Technological Sciences
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：59
• 期：12
• 页码：1847-1855
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Engineering, general;
• 出版者：Science China Press
• ISSN：1869-1900
• 卷排序：59

文摘

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-ε 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-ε 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.