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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Hybrid Brush Pocket Damper Seals for Turbomachinery

[+] Author and Article Information
Hector E. Laos, John M. Vance, Steven E. Buchanan

Department of Mechanical Engineering, Texas A&M University, College Station, Texas 77843-3123

J. Eng. Gas Turbines Power 122(2), 330-336 (Jan 03, 2000) (7 pages) doi:10.1115/1.483211 History: Received March 09, 1999; Revised January 03, 2000
Copyright © 2000 by ASME
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References

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Childs, D., 1993, Turbomachinery Rotordynamics, Phenomena, Modeling and Analysis, John Wiley and Sons, New York.
Von Pragenau, G. L., 1992 “From Labyrinth Seals to Damping Seals/Bearings,” presented at the Fourth International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC-4), Honolulu, Hawaii, pp. 277–285.
Vance, J. and Schultz, R., 1993, “A New Damper Seal for Turbomachinery,” Vibration of Rotating Systems, ASME DE, 60 , September 1993.
Childs,  D., and Scharrer,  J., 1988, “Theory versus Experiment for the Rotordynamic Coefficients of Labyrinth Gas Seals: Part II—A Comparison to Experiment,” ASME J. Vibr. Acoust., 110, pp. 281–287.
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Richards, R. L., Vance, J. M., Paquette, D. J., and Zeidan, F. Y, 1995, “Using a Damper Seal to Eliminate Subsynchronous Vibrations in Three Back to Back Compressors,” Proceedings of the 24th Turbomachinery Symposium, Houston, Texas, September 26–28, 1995, pp. 59–71.
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Conner, K., and Childs, D., 1990, “Rotordynamic Coefficient Test Results for a 4-Stage Brush Seal,” AIAA Paper No. 90-2139.
Hendricks, R. C., Griffin, T. A., Kline, T. R., Csavina, K. R., Pancholi, A., Sood, D., 1994, “Relative Performance Comparison Between Baseline Labyrinth and Dual Brush Compressor Discharge Seals in a T-700 Engine Test,” presented at the International Gas Turbine and Aeroengine Congress and Exposition, The Hague, Netherlands, June 13–16, ASME Paper 94-GT-266.
Vance,  J. M., Cardon,  B., San Andrés,  L., and Storace,  A., 1993, “A Gas Operated Bearing Damper for Turbomachinery,” ASME J. Eng. Gas Turbines Power, 115, No. 2, pp. 383–389.
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Wilcoxon Research, 1984, Operating Guide for the Model F4 Electromagnetic Shaker, Rockville, Maryland.

Figures

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Measured unbalance response with no seal, labyrinth seal, and a pocket damper seal (TAMSEAL™) 17
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The brush hybrid pocket damper seal with optional bypass flow paths
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Computed damping coefficient versus leakage for the brush pocket hybrid (two-bladed) and the original pocket damper seal (6 blades) (inlet pressure of 6.4 bar (80 psig))
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Cross section of the test apparatus
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Side view of the test apparatus
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Shaker supported on bungee cords
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Two-bladed pocket damper seal assembly without brush elements
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Typical coherence for the transfer function measurements
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Transfer function a/F for the brush hybrid pocket damper seal at various pressures
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Phase plots associated with Fig. 9
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Predicted damping coefficients for the hybrid brush (BHS) and labyrinth seal
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Measured damping for the labyrinth seal, the brush element only, and the BHS with open and closed bypass
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Measured mass flow through the seals

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