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Prediction of Sheet Cavitation in a Centrifugal Pump Impeller With the Three-Dimensional Potential-Flow Model

[+] Author Affiliations
R. J. H. Dijkers, J. G. H. Op de Woerd

Flowserve Corporation, Hengelo, The Netherlands

B. Fumex, N. P. Kruyt, H. W. M. Hoeijmakers

University of Twente, Enschede, The Netherlands

Paper No. FEDSM2005-77240, pp. 1233-1238; 6 pages
doi:10.1115/FEDSM2005-77240
From:
  • ASME 2005 Fluids Engineering Division Summer Meeting
  • Volume 1: Symposia, Parts A and B
  • Houston, Texas, USA, June 19–23, 2005
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-4198-7 | eISBN: 0-7918-3760-2
  • Copyright © 2005 by ASME

abstract

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.

Copyright © 2005 by ASME

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