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Surge Instability on a Cavitating Propeller

Duttweiler, Mark E. and Brennen, Christopher E. (2001) Surge Instability on a Cavitating Propeller. In: CAV2001: Fourth International Symposium on Cavitation, 20-23 June 2001, Pasadena, CA, USA.

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This study details experiments investigating a previously unrecognized surge instability on a cavitating propeller in a water tunnel. The surge instability is furst explored through visual observation of the cavitation on the propeller blades and in the tip vortices. Similarities between the instability and previously documented cavitation phenomena are noted. Measurements of the radiated pressure are then obtained, and the acoustic signature of the instability is identified. The magnitudes of the fluctuating pressures are very large, presumably capable of producing sever hull vibration on a ship. The origins of the instability are explored through separate investigation of the cavitation dynamics and the response of the water tunnel to volumetric displacement in the working section. Experiments are conducted to quantify the dynamics of the propeller vacitation. Finally, a model is developed for the complete system, incorporating both the cavitation and facility dynamics. The model predicts active system dynamics (linked to the mass flow gain factor familiar in the context of pump dynamics) and therefore potentially unstable behavior for two distinct frequency ranges, one of which appears to be responsible for the instability.

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Additional Information:This research program was partly supported by the Office of Naval Research under grant number N00014-91-J-1295. The authors are grateful for the propellers provided by Dr. Stuart Jessup and the David Taylor Model Basin. We also greatly appreciate the advice and encouragement of Professors Allan Acosta and Tim Colonius and the help of Teichi Tanaka, Philip Rodriguez, Dale Parkes and Steve Schell.
Record Number:CaltechAUTHORS:DUTcav01
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98
Deposited By: Christopher Brennen
Deposited On:05 Oct 2004
Last Modified:02 Oct 2019 22:16

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