The Effect of Inlet Swirl on the Rotordynamic Shroud Forces in a Centrifugal Pump
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.
Additional Information
Contributed by the International Gas Turbine Institute and presented at the 37th International Gas Turbine and Aeroengines Congress and Exposition, Cologne, Germany, June 1-4, 1992. Manuscript received by the International Gas Turbine Institute February 11, 1992. Paper No. 92-GT-126. The assistance provided by F. Zhuang, A. Bhattacharyya, F. Rahman, and Sandor Nagy with the experimental program is greatly appreciated. We would also like to thank NASA George Marshall Space Flight Center for support under Grant NO. NAG8-118.Files
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2004-10-08Created from EPrint's datestamp field
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