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Physical Investigation of a Cavitation Vortex Collapse

Couty, Philippe and Farhat, Mohamed and Avellan, Francois (2001) Physical Investigation of a Cavitation Vortex Collapse. 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 (Unpublished) http://resolver.caltech.edu/CAV2001:sessionA6.003

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Abstract

Most of severe cavitation erosion of hydraulic machines are found to be associated with the collapse of transient cavitation vortices downstream of a leading edge cavity. The dynamics of such a type of cavitation is studied in a Cavitation Vortex Generator (CVG). By producing the cyclic growth and collapse of a single cavitation vortex, this device provides a way to investigate the mechanisms involved in the final stage of the vapour cavity collapse. The observations of vapour structures and emitted shock waves are based on high-speed visualisations (up to $2 10^6$ frames/s) which are obtained by using a shadowgraph video system. Luminescence sources which are emitted during the collapse are visualised by using an intensified camera. By adjusting a short exposure time of 500 $ns$ before shock waves are captured, this allows the time of minimum cavity volume and position to be estimated. This paper presents the complex physical mechanisms of cavitation vortex collapse which have been pointed out with these simultaneous visualisations.


Item Type:Conference or Workshop Item (Lecture)
Subject Keywords:cavitation, vortices, shock waves, luminescence, erosion
Record Number:CAV2001:sessionA6.003
Persistent URL:http://resolver.caltech.edu/CAV2001:sessionA6.003
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:123
Collection:CaltechCONF
Deposited By: Imported from CAV2001
Deposited On:31 May 2001
Last Modified:26 Dec 2012 07:09

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