Mechanism and Control of Cloud Cavitation

[+] Author and Article Information
Y. Kawanami, H. Kato, H. Yamaguchi, M. Tanimura, Y. Tagaya

Department of Naval Architecture and Ocean Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo, 113 Japan

J. Fluids Eng 119(4), 788-794 (Dec 01, 1997) (7 pages) doi:10.1115/1.2819499 History: Received September 19, 1996; Revised May 06, 1997; Online January 22, 2008


Generation mechanism of cloud cavitation on a hydrofoil section was investigated in a sequence of experiments through observation of cloud cavitation by high-speed video and high-speed photo as well as pressure measurements by pressure pick-ups and a hydrophone. The mechanism was also investigated by controlling cloud cavitation with an obstacle fitted on the foil surface. From the results of these experiments, it was found that the collapse of a sheet cavity is triggered by a re-entrant jet rushing from the trailing edge to the leading edge of the sheet cavity, and consequently, the sheet cavity is shed in the vicinity of its leading edge and thrown downstream as a cluster of bubbles called cloud cavity. In other words, the re-entrant jet gives rise to cloud cavitation. Moreover, cloud cavitation could be controlled effectively by a small obstacle placed on the foil. It resulted in reduction of foil drag and cavitation noise.

Copyright © 1997 by The American Society of Mechanical Engineers
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