A Nonlinear Calculation of Rotating Cavitation in Inducers

[+] Author and Article Information
Y. Tsujimoto

Osaka University, Department of Mechanical Engineering, Toyonaka, Osaka 560, Japan

S. Watanabe, Y. Yoshida

Osaka University, Engineering Science, Toyonaka, Osaka, Japan

K. Kamijo

Rocket Propulsion Division, National Aerospace Laboratory, Kakuda Research Center, Kakuda, Miyagi, Japan

J. Fluids Eng 118(3), 589-594 (Sep 01, 1996) (6 pages) doi:10.1115/1.2817799 History: Received November 02, 1994; Revised March 06, 1996; Online December 04, 2007


In the previous linear analysis (Tsujimoto et al., 1993) it was found that there can be a backward rotating cavitation as well as a forward mode which rotates faster than impeller. Although some shaft vibration has been observed, which might be caused by the backward mode, experimental evidence has been obtained only for the forward mode. The purpose of the present study is to find out the factors which determine the amplitude of each mode of rotating cavitation by taking into account several nonlinearities. A time marching nonlinear 2-D flow analysis was carried out for this purpose. It was found that the increase of cavitation compliance at lower inlet pressure can be a factor which limits the amplitude. The mode selectivity is mainly dependent on the stability limit obtained by a linear analysis for which the phase delay of cavity has a most important effect.

Copyright © 1996 by The American Society of Mechanical Engineers
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