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RESEARCH PAPERS

Investigation of Unsteady Sheet Cavitation and Cloud Cavitation Mechanisms

[+] Author and Article Information
T. M. Pham, F. Larrarte, D. H. Fruman

Ecole Nationale Supérieure de Techniques Avancées Groupe Phénomènes d’Interface Chemin de la Hunière, 91761 Palaiseau Cedex, France

J. Fluids Eng 121(2), 289-296 (Jun 01, 1999) (8 pages) doi:10.1115/1.2822206 History: Received January 21, 1998; Revised December 21, 1998; Online January 22, 2008

Abstract

Sheet cavitation on a foil section and, in particular, its unsteady characteristics leading to cloud cavitation, were experimentally investigated using high-speed visualizations and fluctuating pressure measurements. Two sources of sheet cavitation instability were evidenced, the re-entrant jet and small interfacial waves. The dynamics of the re-entrant jet was studied using surface electrical probes. Its mean velocity at different distances from the leading edge was determined and its role in promoting the unsteadiness of the sheet cavitation and generating large cloud shedding was demonstrated. The effect of gravity on the dynamics of the re-entrant jet and the development of interfacial perturbations were examined and interpreted. Finally, control of cloud cavitation using various means, such as positioning a tiny obstacle (barrier) on the foil surface or performing air injection through a slit situated in the vicinity of the leading edge, was investigated. It was shown that these were very effective methods for decreasing the amplitude of the instabilities and even eliminating them.

Copyright © 1999 by The American Society of Mechanical Engineers
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