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Partial cavity instabilities

Duttweiler, M. E. and Brennen, C. E. (1998) Partial cavity instabilities. In: 1998 US-Japan Seminar on Abnormal Flow Phenomena in Turbomachines, 1-6 November 1998, Osaka, Japan. (Unpublished) http://resolver.caltech.edu/CaltechAUTHORS:DUT18b

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Abstract

This paper reviews some of the literature on partial cavity instabilities on single hydrofoils and then summarizes the striking differences in the appearance and behavior of partial cavities on swept foils (as opposed to two-dimensional, unswept foils) as rcently highlighted by de Lange et al. (1994) and Laberteaux and Ceccio (1998). These demonstrate the importance of the spanwise evolution of the re-entrant jet, and the consequences for the characteristics of the cavity closure flow. It is suggested in this paper that several variants of this evolution can be seen in the photographs of cavitation on single hydrofoils foils and on propellers. What is common to many of these variants is that, the spanwise evolution of the cavity and the re-entrant jet can give rise to conditions at some particular spanwise location(s) which initiate partial cavity instability. In this paper we present information on an instability that was observed to occur on a cavitating propeller of modern US Navy design. Detailed photographic examinations show that the instability oscillations involve spanwise development of a re-entrant jet and behavior similar to that of the partial cavity oscillations previously observed on two-dimensional foils.


Item Type:Conference or Workshop Item (Paper)
Additional Information:The author is grateful to the Office of Naval Research and technical monitor Dr. Edwin Rood for the support of this research under Contract N00014-97-1-0002. Thanks are also due to Dr. Stuart Jessup and the David Taylor Model Basin for the loan of the propellers used in this program and to Dale Parkes for his help with the propeller experiments.
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Deposited On:13 Jan 2006
Last Modified:26 Dec 2012 08:44

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