Fundamental Design Issues of Brush Seals for Industrial Applications

[+] Author and Article Information
Saim Dinc, Mehmet Demiroglu, Norman Turnquist, Jason Mortzheim

GE Research and Development Center, Schenectady, NY 12309

Gayle Goetze, John Maupin, James Hopkins

GE Power Generation, Greenville, SC 29602

Christopher Wolfe, Mark Florin

GE Power Generation, Schenectady, NY 12345

J. Turbomach 124(2), 293-300 (Apr 09, 2002) (8 pages) doi:10.1115/1.1451847 History: Received February 27, 2001; Online April 09, 2002
Copyright © 2002 by ASME
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Turnquist, A., Tseng, T., McNickle, A., and Steinetz, B., 1999, “Full Scale Testing of an Aspirating Face Seal With Angular Misalignment,” AIAA Paper No. Paper 99-2682.
Aksit, M. F., Bagepalli, B. S., Demiroglu, M., Dinc, O., S., Kellock, I., and Farrell, T., 1999, “Advanced Flexible Seals for Gas Turbine Shroud Applications,” AIAA Paper No. 99–2827.
Dinc, S., Turnquist, N. A., et al., 1998, “Brush Seals in Industrial Gas Turbines—Turbine Section Interstage Sealing,” AIAA Paper No. 98–3175
Chupp, R. E., Prior, R. J., Loewenthal, R. G., Menendez, R. P., 1997, “Advanced Seal Development for Large Industrial Gas Turbines,” Paper No. AIAA 97-2731, presented at 33rd AIAA? ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, Seattle, WA, July 6–9.
Soditus, S. M., 1998, “Commercial Aircraft Maintenance Experience Relating to Current Sealing Technology,” AIAA Paper No. 98–3284.
Chen, L. H., Wood, P. E., Jones, T. V., and Chew, J. W, 1999, “Detailed Experimental Studies of Flow in Large Scale Brush Seal Model and A Comparison with CFD Predictions,” AIAA Paper No. 99-GT-281


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Typical brush seal designs for (a) steam turbine, and (b) gas turbine applications
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Typical brush seal leakage data compared to a typical labyrinth seal
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(a) Typical steam turbine brush seal packing ring assembly. (b) 7EA gas turbine HPP brush seal after 22,000 h of operation.
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Advanced seals locations on a Frame 7EA gas turbine
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Examples of allowable design limits and interaction with the seal design parameters
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Seal relative radial and axial transient closures
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Pressure forces acting on the seal bristle pack
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Flow diagram for bristle stress and deflection analysis
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Seal line to line leakage characteristics as a function of seal ΔP (y scale shows the ratio of brush seal leakage to laby seal leakage)
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Leakage characteristics of a typical seal under seal interference and clearance conditions (y scale shows the ratio of Brush seal leakage at a specified condition seal line-to-line leakage)
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7EA machine HPP brush seal field data during 22,000 h of operation: (from top left corner, clockwise) brush seal clearance due to wear versus labyrinth seal clearance due to rub, brush seal flow versus labyrinth seal flow, additional kW-h saving of the brush seal in the sealing system, brush seal performance degradation over 3 yr (as new seal provided additional 1.1 percent MW, after 3 yr provided 0.7 percent MW, seal returned to the machine after engine overhaul for additional 3 yr service the seal during overhaul is shown in Fig. 3(b))
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(a) Previous version of a seal from the engine after about 1000 cycles; (b) new and improved version of the seal after 2000 cycles at the same location on the similar engine




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