A Theoretical Analysis of Rotating Cavitation in Inducers

[+] Author and Article Information
Y. Tsujimoto

National Aerospace Laboratory, Kakuda Research Center, Miyagi, Japan

K. Kamijo

National Aerospace Laboratory, Kakuda Research Center, Kimigaya, Kakuda, Miyagi, 981-15 Japan

Y. Yoshida

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

J. Fluids Eng 115(1), 135-141 (Mar 01, 1993) (7 pages) doi:10.1115/1.2910095 History: Received December 17, 1991; Online May 23, 2008


Rotating cavitation was analyzed using an actuator disk method. Quasi-steady pressure performance of the impeller, mass flow gain factor, and cavitation compliance of the cavity were taken into account. Three types of destabilizing modes were predicted: rotating cavitation propagating faster than the rotational speed of the impeller, rotating cavitation propagating in the direction opposite that of the impeller, and rotating stall propagating slower than the rotational speed of the impeller. It was shown that both types of rotating cavitation were caused by the positive mass flow gain factor, while the rotating stall was caused by the positive slope of the pressure performance. Stability and propagation velocity maps are presented for the two types of rotating cavitation in the mass flow gain factor-cavitation compliance plane. The correlation between theoretical results and experimental observations is discussed.

Copyright © 1993 by The American Society of Mechanical Engineers
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