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TECHNICAL PAPERS: Gas Turbines: Heat Transfer

Numerical Simulation of Three-Dimensional Bristle Bending in Brush Seals

[+] Author and Article Information
Cesare Guardino

CD-adapco Group, London Office, 200 Shepherd Bush Road, London W6 7NY, UKe-mail: cesare@uk.cd-adapco.com

John W. Chew

School of Engineering, University of Surrey, Guildford, Surrey GU2 7XH, UKe-mail: j.chew@surrey.ac.uk

J. Eng. Gas Turbines Power 127(3), 583-591 (Jun 24, 2005) (9 pages) doi:10.1115/1.1850943 History: Received October 01, 2003; Revised March 01, 2004; Online June 24, 2005
Copyright © 2005 by ASME
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References

Chupp, R. E., and Holle, G. F., 1992, “Simple Leakage Model for Brush Seals,” Proc. of 27th AIAA/SAE/ASME Joint Propulsion Conference, AIAA, Washington, DC, Paper No. 91-1913.
Bayley, F. J., and Long, C. A., 1992, “A Combined Experimental and Theoretical Study of Flow and Pressure Distributions in a Brush Seal,” ASME, New York, ASME Paper No. ASME 92-GT-355.
Turner, M. T., Chew, J. W., and Long, C. A., 1997, “Experimental Investigation and Mathematical Modelling of Clearance Brush Seals,” ASME Paper No. 97-GT-282.
Hendricks, R. C., Schlumbergeer, S., Braun, M. J., Choy, F., and Mullen, R. L., 1991, “A Bulk Flow Model of a Brush Seal System,” ASME Paper No. 91-GT-235.
Chew,  J. W., Lapworth,  B. L., and Millener,  P. J., 1995, “Mathematical Modelling of Brush Seals,” Int. J. Heat Fluid Flow, 16, 493–500.
Chen, L. H., Wood, P. E., Jones, T. V., and Chew, J. W., 1998, “An Iterative CFD and Mechanical Brush Seal Model and Comparison With Experimental Results,” ASME Paper No. 98-GT-372.
Aksit, M. F., and Tichy, J. A., 1996, “A Computational Model of Brush Seal Bristle Deflection,” Proc. of 32nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference, AIAA, Washington, DC, Paper No. 96-2909.
Crudgington, P. F., and Bowsher, A., 2002, “Brush Seal Pack Hysteresis,” 38th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, AIAA, Washington, DC, Paper No. 2002–3794.
Crudgington, P. F., and Bowsher, A., 2003, “Brush Seal Blow Down,” 39th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, AIAA, Washington, DC, Paper No. 2003–4697.
Fenner, R. T., 1989, Mechanics of Solids, Blackwell Scientific Publications.
Guardino, C., 2003, “Numerical Simulation of 3D Bristle Bending in Brush Seals,” University of Surrey Research Report, FRC/2002.13.
Guardino, C., 2003, SUBSIS (Surrey University Brush Seal Iterative Simulator), Version 3.01—User Guide, University of Surrey Research Report.
Guardino, C., and Chew, J. W., 2002, “Simulation of Flow and Heat Transfer in the Tip Region of a Brush Seal,” University of Surrey Research Report, FRC/2002.03.
http://www.alloywire.com/haynes25.htm

Figures

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Schematic of a brush seal
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Global and bristle-oriented coordinates (Y=const plane)
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Bristle deflections and notation
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3D bristle-to-bristle interactions
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Bristle interactions in a Z=const plane
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Ellipse geometry and notation
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Free bristle-point movement in a ξ=const plane
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Rotation of reaction forces
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Rotor interference, 3D global view
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Bristle-backing ring reactions
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Bending of a row of bristles
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Incursion of a single bristle into a hexagonally-packed brush
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Bristle tip positions (Δp=0.0 bar,Zrotor=0.20 mm, ϕ=45 deg, δ=0.0 mm)
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3D bristle deflections (Δp=0.0 bar,Zrotor=0.20 mm, ϕ=45 deg, δ=0.0 mm)
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Deflections of first bristle column (Δp=1.0 bar,Zrotor=0.20 mm, ϕ=45 deg)
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Deflections of downstream bristle row (Δp=1.0 bar,Zrotor=0.20 mm, ϕ=45 deg)
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Bristle tip positions (Δp=1.0 bar,Zrotor=0.20 mm, ϕ=45 deg)
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Radial force on rotor (Δp=1.0 bar,Zrotor=0.20 mm, ϕ=45 deg)
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Effect of increasing the pressure load Δp(Zrotor=0.20 mm, ϕ=45 deg)
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Effect of increasing rotor interference Zrotor(Δp=4.0 bar, ϕ=45 deg)
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Effect of increasing the lay-angle ϕ (Δp=1.0 bar,Zrotor=0.20 mm)
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Effect of varying the Young’s modulus E(Δp=1.0 bar,Zrotor=0.20 mm, ϕ=45 deg)

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