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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

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).
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(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.
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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)
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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.)
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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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