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Unsteady attached cavitation on an oscillating hydrofoil

Published online by Cambridge University Press:  21 April 2006

J. P. Franc  and
J. M. Michel
J. P. Franc
Affiliation:
Institute de Mécanique de Grenoble, Université de Grenoble, B. P. 68-38402, Saint-Martin-d'Hères Cédex, France
J. M. Michel
Affiliation:
Institute de Mécanique de Grenoble, Université de Grenoble, B. P. 68-38402, Saint-Martin-d'Hères Cédex, France
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Abstract

A series of visualizations of non-cavitating and cavitating unsteady flows around an oscillating hydrofoil has been carried out in order to investigate the effect of unsteadiness on attached cavitation. The major conclusion of the present experimental analysis is that the strong interaction that was previously pointed out in the case of steady cavitation between an attached cavity and the boundary layer which develops upstream cavity detachment, still plays a prominent role in unsteady cavitation. We propose to generalize for the case of unsteady attached cavitation the two following points which were initially established under steady conditions and which constitute a cavitation detachment criterion:

  1. a cavity detaches behind laminar separtion of the boundary layer;

  2. transition to turbulence sweeps away an attached cavity.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 193 , August 1988 , pp. 171 - 189
Copyright
© 1988 Cambridge University Press

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