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.
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July 1997
Research Papers
Eccentricity Effects on the Rotordynamic Coefficients of Plain Annular Seals: Theory Versus Experiment
O. R. Marquette,
O. R. Marquette
E. D. F., Direction Etudes et Recherches, De´partement Machines, 78401 Chatou Cedex, France
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D. W. Childs,
D. W. Childs
Mechanical Engineering Department, Turbomachinery Laboratory, Texas A&M University, College Station, TX 77843-3254
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L. San Andres
L. San Andres
Mechanical Engineering Department, Turbomachinery Laboratory, Texas A&M University, College Station, TX 77843-3254
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O. R. Marquette
E. D. F., Direction Etudes et Recherches, De´partement Machines, 78401 Chatou Cedex, France
D. W. Childs
Mechanical Engineering Department, Turbomachinery Laboratory, Texas A&M University, College Station, TX 77843-3254
L. San Andres
Mechanical Engineering Department, Turbomachinery Laboratory, Texas A&M University, College Station, TX 77843-3254
J. Tribol. Jul 1997, 119(3): 443-447 (5 pages)
Published Online: July 1, 1997
Article history
Received:
December 18, 1995
Revised:
June 30, 1996
Online:
January 24, 2008
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Citation
Marquette, O. R., Childs, D. W., and San Andres, L. (July 1, 1997). "Eccentricity Effects on the Rotordynamic Coefficients of Plain Annular Seals: Theory Versus Experiment." ASME. J. Tribol. July 1997; 119(3): 443–447. https://doi.org/10.1115/1.2833515
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