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Numerical study on the effects of air valve characteristics on pressure surges during pump trip in pumping systems with air entrainment
Author(s) -
Lee T.S.,
Leow L.C.
Publication year - 1999
Publication title -
international journal for numerical methods in fluids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 112
eISSN - 1097-0363
pISSN - 0271-2091
DOI - 10.1002/(sici)1097-0363(19990330)29:6<645::aid-fld804>3.0.co;2-q
Subject(s) - surge , air entrainment , outflow , entrainment (biomusicology) , computer simulation , inflow , computational fluid dynamics , mechanics , environmental science , atmospheric pressure , meteorology , engineering , geology , geography , physics , rhythm , acoustics
An improved numerical model and computational method are proposed here for the study of the effects of air valve characteristics on pressure surges during pump trip in fluid systems with air entrainment. Numerical experiments have shown that air valves with higher inflow characteristics installed at peak locations of a fluid system may reduce the magnitude of the extreme negative pressure surges. However, for near zero air entrainment levels in the fluid system, air valves with higher outflow characteristics tend to result in higher positive pressure surges. The results of the numerical simulations seem to be in qualitative agreement with available field observations [T.S. Lee and H.F. Cheong, Teck Hock Pumping Station: Flow Rate and Pressure Transient Measurements , Johnson Pacific, Singapore, 1994]. Copyright © 1999 John Wiley & Sons, Ltd.