The occurrence of cavitation is one of the main limiting factors in the operation and design of centrifugal pumps. In this paper a model for the prediction of sheet cavitation is described. This model has been implemented in a three-dimensional finite-element package, employing the potential-flow approximation of the governing flow equations. At the interface between vapor and liquid, pressure equilibrium is required. The closure region of the cavity is modeled as the collapse of a bubble, whose motion is described by the Rayleigh-Plesset equation. The effect of displacement of the flow due to presence of the sheet cavity is incorporated by the transpiration technique. This is a linearised approach which is well-known from techniques for coupling inviscid-flow methods to boundary-layer methods. The model gives the location of the sheet cavity (if present); its length is thus also predicted. The model has been validated by comparing sheet cavitation at the blades of a centrifugal pump impeller, obtained from CFD-computations and from visual observations in a model test.
Prediction of Sheet Cavitation in a Centrifugal Pump Impeller With the Three-Dimensional Potential-Flow Model
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Dijkers, RJH, Fumex, B, Op de Woerd, JGH, Kruyt, NP, & Hoeijmakers, HWM. "Prediction of Sheet Cavitation in a Centrifugal Pump Impeller With the Three-Dimensional Potential-Flow Model." Proceedings of the ASME 2005 Fluids Engineering Division Summer Meeting. Volume 1: Symposia, Parts A and B. Houston, Texas, USA. June 19–23, 2005. pp. 1233-1238. ASME. https://doi.org/10.1115/FEDSM2005-77240
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