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TECHNICAL PAPERS

Effect of Flow-Induced Radial Load on Brush Seal/Rotor Contact Mechanics

[+] Author and Article Information
Haifang Zhao, Robert J. Stango

Department of Mechanical Engineering, Marquette University, Milwaukee, WI

J. Tribol 126(1), 208-215 (Jan 13, 2004) (8 pages) doi:10.1115/1.1609492 History: Received February 25, 2003; Revised June 24, 2003; Online January 13, 2004
Copyright © 2004 by ASME
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References

Wood, P. E., 1998, “Investigation of Contact Forces, Flow, Pressure, Hysteresis and Frictional Effects in Brush Seals,” dissertation, University of Oxford, UK.
Chen,  L. H., Wood,  P. E., Jones,  T. V., and Chew,  J. W., 1999, “An Iterative CFD and Mechanical Brush Seal Model and Comparison With Experimental Results,” ASME J. Eng. Gas Turbines Power, 121, pp. 656–662.
Bayley,  F. J., and Long,  C. A., 1993, “A Combined Experimental and Theoretical Study of Flow and Pressure Distributions in a Brush Seal,” ASME J. Eng. Gas Turbines Power, 115, pp. 404–410.
Turner,  M. T., Chew,  J. W., and Long,  C. A., 1998, “Experimental Investigation and Mathematical Modeling of Clearance Brush Seals,” ASME J. Eng. Gas Turbines Power, 120, pp. 573–579.
Chupp,  R. E., and Dowler,  C. A., 1993, “Performance Characteristics of Brush Seals for Limited Life Engines,” ASME J. Eng. Gas Turbines Power, 155, pp. 390–396.
Carlile,  J. A., Hendricks,  R. C., and Yoder,  D. A., 1993, “Brush Seal Leakage Performance with Gaseous Working Fluids at Static and Low Rotor Speed Conditions,” ASME J. Eng. Gas Turbines Power, 115, pp. 397–403.
Chupp,  R. E., and Holle,  G. F., 1996, “Generalizing Circular Brush Seal Leakage Through a Randomly Distributed Bristle Bed,” ASME J. Turbomach., 118, pp. 153–161.
Chew,  J. W., and Hogg,  S. I., 1997, “Porosity Modeling of Brush Seals,” ASME J. Tribol., 119, pp. 769–775.
Sharatchandra,  M. C., and Rhode,  D. L., 1996, “Computed Effects of Rotor-Induced Swirl on Brush Seal Performance—Part 1: Leakage Analysis,” ASME J. Tribol., 118, pp. 912–919.
Sharatchandra,  M. C., and Rhode,  D. L., 1996, “Computed Effects of Rotor-Induced Swirl on Brush Seal Performance—Part 2: Bristle Force Analysis,” ASME J. Tribol., 118, pp. 920–926.
Modi, S. S., 1995, “Simulation of Bristle Tip Lift-off in a Brush Seal,” thesis, Texas A&M University, College Station, TX.
Aksit,  M. F., and Tichy,  J. A., 1998, “Wear of Brush Seals: Background and New Modeling Approach,” Tribol. Trans., 41, pp. 368–374.
Stango,  R. J., Zhao,  H., and Shia,  C. Y., 2003, “Analysis of Contact Mechanics for Rotor-Bristle Interference of Brush Seal,” ASME J. Tribol., 125, pp. 414–421.
www.haynesintl.com, “Haynes® Alloy .”
Schlumberger, J. A., Proctor, M. P., and Hendricks, R. C., 1991 “Eccentricity Effects on Leakage of a Brush Seal at Low Speeds,” NASA TM-105141.
Budynas, R. G., 1999, Advanced Strength and Applied Elasticity, 2nd ed., McGraw-Hill, New York, pp. 152–156.

Figures

Grahic Jump Location
(a) Downstream view of brush seal depicting interference parameter Δ* and inward radial flow-induced load qo, along with contact force generated at interface of fiber tip and rotor, and (b) section view of annular front and back plate that constrain bristle pack. Arrows (inset figure) depict direction of radial flow (a-b) and axial flow (c-d).
Grahic Jump Location
(a) Depiction of deformed bristle subjected to uniform load qo and equilibrating rotor reaction force at fiber tip. Free body diagram (inset figure) depicts the system of forces acting within and along an arbitrary segment of the bristle, and (b) geometry of deformed bristle illustrating length coordinates and fiber slope φ in local frame of reference.
Grahic Jump Location
Relationship between dimensionless bristle resultant force and dimensionless flow-induced load for lay angles of 15, 30, 45, and 60 deg. Arrows denote point at which bristle yield curvature/stress is reached. (Results shown are for μ=0.21,Rs/H*=8.9, and Δ*/H*=0.)
Grahic Jump Location
Relationship between dimensionless bristle resultant force and dimensionless flow-induced load for lay angles of 15, 30, 45, and 60 deg. Arrows denote point at which bristle yield stress is reached. (Results shown are for μ=0.21,Rs/H*=8.9, and Δ*/H*=0.14.)
Grahic Jump Location
Relationship between actual bristle resultant force Fres and actual flow-induced load qo for lay angles of 15, 30, and 45 deg. Arrows denote point at which bristle yield stress is reached. (Results shown are for μ=0.21,Rs/H*=8.9, and Δ*/H*=0.)
Grahic Jump Location
Relationship between actual bristle resultant force Fres and actual flow-induced load qo for lay angles of 15, 30, and 45 degrees. Arrows denote point at which bristle yield stress is reached. (Results shown are for μ=0.21,Rs/H*=8.9 and Δ*/H*=0.14.)
Grahic Jump Location
Relationship between actual bristle resultant force Fres and actual flow-induced load qo for coefficients of friction μ=0, 0.1, and 0.21. (Results shown are for lay angle of 45 deg, Rs/H*=8.9, and Δ*/H*=0)
Grahic Jump Location
Relationship between slope at bristle tip and actual flow-induced load qo for lay angles of 15, 30, and 45 deg. (Results shown are for μ=0.21,Rs/H*=8.9, and Δ*/H*=0.07.)
Grahic Jump Location
Relationship between the location at which maximum bristle curvature (or stress) occurs and actual flow-induced load qo for interference parameters Δ*/H*=0.0, 0.07, and 0.14 for (a) 45 deg lay angle, (b) 30 deg lay angle, and (c) 15 deg lay angle. Bold arrows denote point at which bristle yield stress is reached. (Results shown are for μ=0.21, and Rs/H*=8.9.)
Grahic Jump Location
Relationship between the maximum bristle bending curvature (or stress) and actual flow-induced load qo for lay angles 15, 30, and 45 deg, along with interference parameter (a) Δ*/H*=0.0, and (b) Δ*/H*=0.14. Horizontal dashed line indicates curvature at which yield stress is reached. (Results shown are for μ=0.21, and Rs/H*=8.9).

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