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Numerical simulation of air entrainment and suppression in pump sump
- Source :
- SCIENCE CHINA Technological Sciences; December 2016, Vol. 59 Issue: 12 p1847-1855, 9p
- Publication Year :
- 2016
-
Abstract
- The dynamics of air entrainment and suppression schemes in a pump sump are investigated. Four different turbulence models (standard k-εmodel, realizable k-εmodel, renormalization group (RNG) k-εmodel and shear-stress transport (SST) k-εmodel) 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-εturbulence 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.
Details
- Language :
- English
- ISSN :
- 16747321 and 18691900
- Volume :
- 59
- Issue :
- 12
- Database :
- Supplemental Index
- Journal :
- SCIENCE CHINA Technological Sciences
- Publication Type :
- Periodical
- Accession number :
- ejs40486502
- Full Text :
- https://doi.org/10.1007/s11431-016-0237-8