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The Rotordynamic Forces on a Centrifugal Pump Impeller in the Presence of Cavitation

Franz, R. and Acosta, A. J. and Brennen, C. E. and Caughey, T. K. (1989) The Rotordynamic Forces on a Centrifugal Pump Impeller in the Presence of Cavitation. In: Pumping Machinery, 1989 : presented at the Third Joint ASCE/ASME Mechanics Conference, University of California, San Diego, La Jolla, California, July 9-12, 1989 / sponsored by the Fluids Engineering Division, ASME. Fluids Engineering Division. Vol.FED-81. No.81. American Society of Mechanical Engineers , New York, pp. 205-211. ISBN 0791803449 http://resolver.caltech.edu/CaltechAUTHORS:FRAasmespm89

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Abstract

An experiment in forced vibration was conducted to study the fluid-induced rotordynamic force on an impeller whirling along a trajectory eccentric to its undeflected position. The prescribed whirl trajectory of the rotor is a circular orbit of a fixed radius. The force measured is a combination of a steady radial force due to volute asymmetries and an unsteady force due to the eccentric motion of the rotor. These measurements have been conducted over a full range of whirl/impeller speed ratios at different flow coefficients for various turbomachines. A destabilizing force was observed over a region of positive whirl ratio. The range of flow conditions examined for a centrifugal impeller in a spiral volute has been enlarged to include cavitation. Compared to the non-cavitating condition, cavitation corresponding to a head loss of three percent did not have a significant effect upon the unsteady force.


Item Type:Book Section
Additional Information:The authors are indebted to the NASA George Marshall Space Flight Center, for continued sponsorship of this research under contract NAS8-33108. One of the authors (R. Franz) would like to thank the Shell Foundation for providing a fellowship that supported his graduate studies.
Record Number:CaltechAUTHORS:FRAasmespm89
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:FRAasmespm89
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:210
Collection:CaltechAUTHORS
Deposited By: Christopher Brennen
Deposited On:10 Dec 2004
Last Modified:26 Dec 2012 08:39

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