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International Journal of Rotating Machinery
Volume 10 (2004), Issue 4, Pages 241-251
http://dx.doi.org/10.1155/S1023621X04000260

Higher Order Rotating Cavitation in an Inducer

1Osaka University, Engineering Science, Osaka, Japan
2Kyushu University, Faculty of Engineering, Fukuoka, Japan
3Division of Mechanical Science, Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan

Copyright © 2004 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In the present study, a higher order rotating cavitation predicted by the stability analysis was identified through the measurements of inlet pressure fluctuations and blade stress fluctuations. The propagation speed ratio of the higher order rotating cavitation is approximately 5, and the amplitude of the blade stress fluctuation caused by this rotating cavitation is the same level as that by the conventional rotating cavitation. In addition, a higher order cavitation surge was observed at the transition point from the conventional to the higher order rotating cavitation.