Rotordynamic Forces in Cavitating Inducers

[+] Author and Article Information
A. Bhattacharyya

Able Corporation, Yorba Linda, CA

A. J. Acosta, C. E. Brennen, T. K. Caughey

Department of Mechanical Engineering, California Institute of Technology, Pasadena, CA 91125

J. Fluids Eng 119(4), 768-774 (Dec 01, 1997) (7 pages) doi:10.1115/1.2819496 History: Received July 20, 1995; Revised March 19, 1997; Online January 22, 2008


This paper reports an experimental investigation of rotordynamic forces in a whirling axial flow inducer under the influence of cavitation at various flow coefficients. The results show the occurrence of large destabilizing peaks in the force tangential to the whirl orbit for positive whirl frequency ratios. The magnitude of the destabilizing forces increased with a decrease in cavitation number and flow coefficient. The rotordynamic data obtained do not exhibit quadratic functional behavior normally assumed in many rotordynamic models. Consequently, conventional generalized stiffness, damping, and inertia matrices cannot be determined for the inducer. The results demonstrate the complexity of rotordynamic forces and their consequences on stability of axial flow inducers.

Copyright © 1997 by The American Society of Mechanical Engineers
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