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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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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