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RESEARCH PAPERS

The Effect of Inlet Swirl on the Rotordynamic Shroud Forces in a Centrifugal Pump

[+] Author and Article Information
A. Guinzburg, C. E. Brennen, A. J. Acosta, T. K. Caughey

California Institute of Technology, Division of Engineering and Applied Science, Pasadena, CA 91125

J. Eng. Gas Turbines Power 115(2), 287-293 (Apr 01, 1993) (7 pages) doi:10.1115/1.2906707 History: Received February 11, 1992; Online April 24, 2008

Abstract

The role played by fluid forces in determining the rotordynamic stability of a centrifugal pump is gaining increasing attention. The present research investigates the contributions to the rotordynamic forces from the discharge-to-suction leakage flows between the front shroud of the rotating impeller and the stationary pump casing. In particular, the dependency of the rotordynamic characteristics of leakage flows on the swirl at the inlet to the leakage path was examined. An inlet guide vane was designed for the experiment so that swirl could be introduced at the leakage flow inlet. The data demonstrate substantial rotordynamic effects and a destabilizing tangential force for small positive whirl ratios; this force decreased with increasing flow rate. The effect of swirl on the rotordynamic forces was found to be destabilizing.

Copyright © 1993 by The American Society of Mechanical Engineers
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