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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Comparison of the Dynamic Characteristics of Smooth Annular Seals and Damping Seals

[+] Author and Article Information
J. M. Darden, E. M. Earhart

NASA Marshall Space Flight Center, TD55, Building 4203, MSFC, AL 35812

G. T. Flowers

Department of Mechanical Engineering, Auburn University, Auburn University, AL 36849-5341

J. Eng. Gas Turbines Power 123(4), 857-863 (Mar 01, 1999) (7 pages) doi:10.1115/1.1383256 History: Received October 01, 1998; Revised March 01, 1999
Copyright © 2001 by ASME
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References

Marquette,  O. R., Childs,  D. W., and San Andres,  L., 1997, “Eccentricity Effects on the Rotordynamic Coefficients of Plain Annular Seals: Theory Versus Experiment,” ASME J. Tribol., 119, pp. 443–448.
Childs, D. W., and Fayolle, P., 1997, “Test Results for Liquid “Damper” Seals Using a Round-Hole Roughness Pattern for the Stators,” unpublished report, Sept.
Darden,  J. M., Earhart,  E. M., and Flowers,  G. T., 1999, “Experimental Rotordynamic Characterization of Annular Seals: Facility and Methodology,” ASME J. Eng. Gas Turbines Power, 121, pp. 349–354.
Padavala, S., Palazzolo, A. B., Vallely, D. P., Ryan, S. G., 1993, “Application of an Improved Nelson-Nguyen Analysis to Eccentric, Arbitrary Profile Liquid Annular Seals,” Workshop on Rotordynamic Instability Problems in High Performance Turbomachinery, Texas A&M University, pp. 113–135.
Childs,  D. W., and Kim,  C. H., 1985, “Analysis and Testing for Rotordynamic Coefficients of Turbulent Annular Seals With Different, Directionally-Homogenous Surface-Roughness Treatment for Rotor and Stator Elements,” ASME J. Tribol., 107, pp. 296–306.
Childs,  D. W., Nolan,  S. A., and Kilgore,  J. J., 1990, “Additional Test Results for Round-Hole-Pattern Damper Seals: Leakage, Friction Factors, and Rotordynamic Force Coefficients,” ASME J. Tribol., 112, pp. 365–371.
Measurement Uncertainty, 1986, ANSI/ASME PTC 19.1-1985 Part 1, 1986.

Figures

Grahic Jump Location
Cut-away view of test rig
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Top view of the test section
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Stiffness comparison for the low seal pressure differential case: solid=experimental direct stiffness, dash-dot=theoretical direct stiffness, dot=experimental cross-coupled stiffness, dash=theoretical cross-coupled stiffness
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Damping and whirl frequency ratio comparison for the low seal pressure differential case: solid=experimental direct damping, dash-dot=theoretical direct damping, dot=experimental whirl frequency ratio, dash=theoretical whirl frequency ratio
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Stiffness comparison for the high seal pressure differential case: solid=experimental direct stiffness, dash-dot=theoretical direct stiffness, dot=experimental cross-coupled stiffness, dash=theoretical cross-coupled stiffness
Grahic Jump Location
Damping and whirl frequency ratio comparison for the high seal pressure differential case: solid=experimental direct damping, dash-dot=theoretical direct damping, dot=experimental whirl frequency ratio, dash=theoretical whirl frequency ratio

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