Kuhn de Chizelle, Yan and Ceccio, Steven L. and Brennen, Christopher E. and Shen, Young (1992) Cavitation scaling experiments with headforms : bubble dynamics. In: Proceedings of the 2nd International Symposium on Propeller and Cavitation, Hangzhou, China, 1-4 September 1992. International Symposium on Propeller and Cavitation , [Beijing], pp. 272-279. http://resolver.caltech.edu/CaltechAUTHORS:KUHispc92
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Utilizing some novel instrumentation which allowed detection and location of individual cavitation bubbles in flows around headforms. Ceccio and Brennen (1991 and 1989) recently examined the interaction between individual bubbles and the structure of the boundary layer and flow field in which the bubble is growing and collapsing. They were able to show that individual bubbles are often fissioned by the fluid shear and that this process can significantly effect the acoustic signal produced by the collapse. Furthermore they were able to demonstrate a relationship between the number of cavitation events and the nuclei number distribution measured by holographic methods in the upstream flow. More recently Kumar and Brenncn (1991-1992) have closely examined further statistical properties of the acoustical signals from individual cavitation bubbles on two different headformsm in order to learn more about the bubble/flow interactions. However the above experiments were all conducted in the same facility with the same size of headform (5.08cm in diameter) and over a fairly narrow range of flow velocities (around 9m/s). Clearly this raises the issue of how the phenomena identified in those earlier experiments change with changes of speed, scale and facility. The present paper will describe experiments conducted in order to try to answer some of these important qucstions regarding the scaling of the cavitation phenomena. We present data from experiments conducted in the Large Cavitation Channel of the David Taylor Research Center in Memphis, Tennessee, on similar headforms which are 5.08, 25.4 and 50.8cm in diameter for speeds ranging up to 15m/s and for a range of cavitation numbers. In this paper we focus on visual observations of the cavitation patterns and changes in these patterns with speed and headform size.
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|Additional Information:||Large scale experiments like these require help of many people and the authors are very grateful to all of those who helped in this enterprise. We are very grateful to the ONR for their support under contracts N00014-91-J-1426 (SLC) and N00014-91-J-1295 (CEB, YKdC). We are also extremely grateful to the David Taylor Research Center (DTRC) and to their staff including W. B. Morgan for making the use of the LCC possible for us. From DTRC both Scott Gowing and James Blanton were important and valued members of the team who conducted the experiments. Po-Wen Yu (U. of Michigan) and Douglas Hart (Caltech) provided important help with the experiments. The staff at the LCC in Memphis, Tenn., were remarkably tolerant and invariably helpful and we wish to thank all of them most sincerely; we are particularly grateful to Bob Etter whose constant support was invaluable.|
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|Deposited On:||27 Jan 2006|
|Last Modified:||26 Dec 2012 08:44|
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