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Experimental Study of Cavitation in a Kaplan Model Turbine

Grekula, M. and Bark, G. (2001) Experimental Study of Cavitation in a Kaplan Model Turbine. In: CAV 2001: Fourth International Symposium on Cavitation, June 20-23, 2001, California Institute of Technology, Pasadena, CA USA. (Unpublished) http://resolver.caltech.edu/CAV2001:sessionB9.004

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Abstract

The cavitation processes present in a Kaplan model turbine was studied with the aim to identify mechanisms that promote erosive cavitation. The studies were carried out with high-speed filming, video filming and visual observations with stroboscopic light. A periodic pattern of the cavitating tip vortex was observed. The main feature of this pattern is that the cavitating vortex is bent towards the blade surface and transformed into cloud formations. These clouds were collapsing in a manner that suggests this to be an erosive process. The blade periphery, where the cloud collapses was observed, is known as an area likely to sustain damage. It was also found that these cloud formations appears in bands, with a periodicity which corresponds approximately to the spacing of the guide vanes. Bubble clouds and cavitating vortices was found to be shed from the sheet cavities which showed signs of re-entrant jets. The cavities at the blade root seem to be mainly of sheet or travelling bubble type, depending on running condition, some facts indicate the contribution of vortex motion as well.


Item Type:Conference or Workshop Item (Lecture)
Subject Keywords:cavitation, cloud cavitation, re-entrant jet, Kaplan turbine
Record Number:CAV2001:sessionB9.004
Persistent URL:http://resolver.caltech.edu/CAV2001:sessionB9.004
Usage Policy:The papers of this symposium proceedings are protected by copyright, retained by the authors. Authors control translation and reproduction rights to these works. However, readers are granted permission for individual, educational, research and non-commercial reproduction, distribution, display and performance of this work in any format. This permission is in addition to rights of reproduction granted under Section 107, 108, and other provisions of the U.S. Copyright Act.
ID Code:73
Collection:CaltechCONF
Deposited By: Imported from CAV2001
Deposited On:01 May 2001
Last Modified:26 Dec 2012 07:09

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