Observations of Oscillating Cavitation of an Inducer

[+] Author and Article Information
Yoshinobu Tsujimoto, Yoshiki Yoshida, Yasukazu Maekawa, Satoshi Watanabe

Osaka University, Engineering Science, Toyonaka, Osaka 560, Japan

Tomoyuki Hashimoto

National Aerospace Laboratory, Kakuda Reserch Center, Kakuda, Miyagi, Japan

J. Fluids Eng 119(4), 775-781 (Dec 01, 1997) (7 pages) doi:10.1115/1.2819497 History: Received April 26, 1996; Revised May 19, 1997; Online January 22, 2008


Oscillating cavitation of an inducer was observed through unsteady inlet pressure measurements and by use of high speed video picture, covering a wide range of flow coefficient and cavitation number. One of the purposes of the study is to identify a mode of rotating cavitation predicted by a linear analysis, and the other is to obtain a general view of oscillating cavitation. The number of rotating cavitation cells and their propagation velocity were carefully determined from the phase difference of pressure fluctuations at various circumferential locations. Various kinds of oscillating cavitation were observed: rotating cavitation rotating faster/slower than impeller rotation, cavitation in backflow vortices, and surge mode oscillations. Effects of inlet and outlet (effective) pipelength were also studied.

Copyright © 1997 by The American Society of Mechanical Engineers
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