Investigation Of The Critical Submergence
At Pump Intakes Based On Multiphase
CFD Calculations
Author(s)
P. Pandazis & F. Blömeling
Abstract
Surface vortices occur at pump intakes, when the water-level sinks below a
critical value. They can affect the intake flow in a disadvantageous manner.
Pump disturbances may be initiated and the mass flow may be decreased or
completely interrupted. The determination of the critical value to avoid surface
vortices is an important part of safety analyses of postulated abnormal operations
and accidents in Light Water Reactors. The vortex formation phenomena are
investigated within the research project \“Generic numerical determination of the
critical submergence at pump intakes to avoid gas entrainment” sponsored by the
German Federal Ministry of Economics and Technology. In this project a
coupled numerical-analytical method has been developed to calculate the critical
submergence. The method is based on the results of two-phase numerical CFD
simulations and on the analytical vortex model of Burgers and Rott. It allows an
efficient investigation of various influence parameters, which affect the critical
submergence. The results of the method are compared with the experimental
results from Jain et al. and Moriya and show a very good agreement. The present
paper describes the performed CFD simulations as well as some validation
results.
Keywords: critical submergence, multiphase vortex simulation, CFD, coupled
method.
Keywords
critical submergence, multiphase vortex simulation, CFD, coupled
method.
Related Book
Other papers in this volume
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