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International Journal of Rotating Machinery
Volume 2012, Article ID 213907, 11 pages
Research Article

Analysis of Cavitation Instabilities in a Four-Blade Inducer

Arts et Metiers ParisTech/LML Laboratory, 8 boulevard Louis XIV, 59046 Lille Cedex, France

Received 26 December 2011; Accepted 18 April 2012

Academic Editor: Meinhard Taher Schobeiri

Copyright © 2012 O. Coutier-Delgosha et al. 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.


The cavitating behavior of a four-blade inducer tested in the LML laboratory large test facility is considered in the present paper. Experimental investigations based on unsteady pressure measurements and records from a six-component balance mounted on the inducer shaft are performed. Spectral analysis of the signals enables to detect several characteristic frequencies related to unbalanced two-phase flow patterns. The objective of the present paper is the understanding of the physical phenomena associated to these frequencies. Therefore, wavelet decomposition, flow visualizations, and direct analysis of the high-frequency force, moment, and pressure signals are applied. Results at nominal flow rate only are considered. Not only classical unbalanced cavitation patterns, but also unexpected flow organizations are discussed.