Some Unsteady Fluid Forces on Pump Impellers

[+] Author and Article Information
R. S. Miskovish, C. E. Brennen

California Institute of Technology, Pasadena, Calif. 91125

J. Fluids Eng 114(4), 632-637 (Dec 01, 1992) (6 pages) doi:10.1115/1.2910078 History: Received April 16, 1991; Online May 23, 2008


Spectral analyses of all the forces and moments acting on a typical centrifugal pump impeller/volute combination are presented. These exhibit shaft frequencies, blade passing frequencies, and beat frequencies associated with a whirl motion imposed on the shaft in order to measure rotordynamic forces. Among other features the unsteady thrust was found to contain a surprisingly large blade passing harmonic. While previous studies have explored the magnitudes of the steady fluid-induced radial forces and the fluid-induced rotordynamic forces for this typical centrifugal pump impeller/volute combination, this paper presents information on the steady bending moments and rotordynamic moments due to the fluid flow. These imply certain axial locations for the lines of action of the radial and rotordynamic forces. Data on the lines of action are presented and allow inferences on the sources of the forces.

Copyright © 1992 by The American Society of Mechanical Engineers
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