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RESEARCH PAPERS

The Dynamic Transfer Function for a Cavitating Inducer

[+] Author and Article Information
C. Brennen, A. J. Acosta

California Institute of Technology, Pasadena, Calif.

J. Fluids Eng 98(2), 182-191 (Jun 01, 1976) (10 pages) doi:10.1115/1.3448255 History: Received August 15, 1975; Online October 12, 2010

Abstract

Knowledge of the dynamic performance of pumps is essential for the prediction of transient behavior and instabilities in hydraulic systems; the necessary information is in the form of a transfer function which relates the instantaneous or fluctuating pressure and mass flow rate at inlet to the same quantities in the discharge from the pump. The presence of cavitation within the pump can have a major effect on this transfer function since dynamical changes in the volume of cavitation contribute to the difference in the instantaneous inlet and discharge mass flow rates. The present paper utilizes results from free streamline cascade theory to evaluate the elements in the transfer function for a cavitating inducer and shows that the numerical results are consistent with the characteristics observed in some dynamic tests on rocket engine turbopumps.

Copyright © 1976 by ASME
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