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RESEARCH PAPERS

An Extended Three-Control-Volume Theory for Circumferentially-Grooved Liquid Seals

[+] Author and Article Information
O. R. Marquette

E.D.F, Direction Etudes et Recherche, Département Machines, 78401 Chatou Cedex, France

D. W. Childs

Turbomachinery Laboratory, Texas A&M University, College Station, TX 77843-3254

J. Tribol 118(2), 276-285 (Apr 01, 1996) (10 pages) doi:10.1115/1.2831296 History: Received January 26, 1995; Revised June 09, 1995; Online January 24, 2008

Abstract

Circumferentially-grooved seals are used in centrifugal pumps to reduce leakage flow. They can also have a significant impact on pump rotordynamic characteristics. Florjancic (1990) developed an analysis for leakage and rotordynamic coefficients, using a partition of the seal into three control volumes. This paper presents a new theory, based on an extension of Florjancic’s work (1990) for circumferentially-grooved liquid seals. The current theory differs from Florjancic’s analysis in the retention of transfer momentum terms and the introduction of diverging flow in the through-flow section within a seal groove. Validation of the new analysis is achieved through a comparison with existing experimental data taken from Kilgore (1988), and Florjancic (1990). Theoretical results are reasonable and consistent; i.e., a modification in the seal parameters induces a correct evolution of the rotordynamic coefficients. Direct and cross-coupled stiffness coefficients are slightly underpredicted, whereas the direct damping coefficient is underpredicted within 40 percent. Leakage flow predictions are very good.

Copyright © 1996 by The American Society of Mechanical Engineers
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