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Experimental Results for the Rotordynamic Characteristics of Leakage Flows in Centrifugal Pumps

Guinzburg, A. and Brennen, C. E. and Acosta, A. J. and Caughey, T. K. (1994) Experimental Results for the Rotordynamic Characteristics of Leakage Flows in Centrifugal Pumps. Journal of Fluids Engineering, 116 (1). pp. 110-115. ISSN 0098-2202. http://resolver.caltech.edu/CaltechAUTHORS:GUIjfme94

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Abstract

In recent years, increasing attention has been give to fluid-structure interaction problems in turbomachines. The present research focuses on just one such fluid-structure interaction problem, namely, the role played by fluid forces in determining the rotordynamic stability and characteristics of a centrifugal pump. The emphasis of this study is to investigate 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. An experiment was designed to measure the rotordynamic shroud forces due to simulated leakage flows for different parameters such as flow rate, shroud clearance, face-seal clearance and eccentricity. The data demonstrate substantial rotordynamic effects and a destabilizing tangential force for small positive whirl frequency ratios; this force decreased with increasing flow rate. The rotordynamic forces appear to be inversely proportional to the clearance and change significantly with the flow rate. Two sets of data taken at different eccentricities yielded quite similar nondimensional rotordynamic forces indicating that the experiments lie within the linear regime of eccentricity.


Item Type:Article
Additional Information:Contributed by the Fluids Engineering Division for publication in the Journal of Fluids Engineering. Manuscript received by the Fluids Engineering Division April 21, 1992; revised manuscript received April 22, 1993. 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 NAG8-118.
Record Number:CaltechAUTHORS:GUIjfme94
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:GUIjfme94
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101
Collection:CaltechAUTHORS
Deposited By: Christopher Brennen
Deposited On:08 Oct 2004
Last Modified:19 Jul 2013 19:37

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