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Rotordynamic Forces from Discharge-to-Suction Leakage Flows in Centrifugal Pumps: Effects of Geometry

Uy, Robert V. and Bircumshaw, Brian L. and Brennen, Christopher E. (1998) Rotordynamic Forces from Discharge-to-Suction Leakage Flows in Centrifugal Pumps: Effects of Geometry. JSME International Journal. Series B, Fluids and Thermal Engineering, 41 (1). pp. 208-213. ISSN 0914-8817. http://resolver.caltech.edu/CaltechAUTHORS:UYRjsme98

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Abstract

The rotordynamic forces generated by the fluid flow through the impeller leakage path of a centrifugal pump are now well established. The present paper examines the effects of modifying the leakage path geometry by changing the front shroud, from a conical shape to a more typical curved design, and the effects of low pressure seal design on these forces. It is found that only the cross-coupled stiffness is affected by the change of path geometry. Changing the low pressure seal from an axial to a radial clearance does, however, significantly affect the rotordynamic forces. A bulk flow numerical model is found to predict the same general result for the low pressure seal tests. The model agrees with the general trends with increasing leakage flow coefficient exhibited by the data, but appears to underpredict the magnitude of the normal force.


Item Type:Article
Additional Information:Received 13th July 1997. The authors wish to thank the Advanced Rotating Machinery group of the Rocketdyne division of Rockwell Aerospace for financial support and assistance.
Subject Keywords:Rotordynamic Force, Leakage Flow, Leakage Path Geometry Effect, Bulk Flow Model
Record Number:CaltechAUTHORS:UYRjsme98
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:UYRjsme98
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:158
Collection:CaltechAUTHORS
Deposited By: Christopher Brennen
Deposited On:06 Jan 2005
Last Modified:26 Dec 2012 08:39

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