Eccentricity Effects on the Rotordynamic Coefficients of Plain Annular Seals: Theory Versus Experiment

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

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

D. W. Childs, L. San Andres

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

J. Tribol 119(3), 443-447 (Jul 01, 1997) (5 pages) doi:10.1115/1.2833515 History: Received December 18, 1995; Revised June 30, 1996; Online January 24, 2008


Reliable high-speed data are presented for leakage and rotordynamic coefficients of a plain annular seal at centered and eccentric positions. A seal with L/D = 0.45 was tested, and measured results have good signal-to-noise ratios. The influence on rotordynamic coefficients of pressure drop, running speed, and static eccentricity was investigated. There is an excellent agreement between experimental and theoretical results in the centered position, even for direct inertia terms, which have not shown good agreement with predictions in past studies. However, the rotordynamic coefficients are more sensitive to changes in eccentricity than predicted. These results suggest that, in some cases, annular seals for pumps may need to be treated more like hydrodynamic bearings, with rotordynamic coefficients which are valid for small motion about a static equilibrium position versus the present eccentricity-independent coefficients.

Copyright © 1997 by The American Society of Mechanical Engineers
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