Calculation of Surface Roughness Effects on Air-Riding Seals

[+] Author and Article Information
C. Guardino, J. W. Chew

Fluids Research Center, School of Engineering, University of Surrey, Guildford, Surrey GU2 7XH, UK

N. J. Hills

Thermo-Fluid Mechanics Research Centre, School of Engineering and Information Technology, University of Sussex, Falmer, Brighton BN1 9QT, UK

J. Eng. Gas Turbines Power 126(1), 75-82 (Mar 02, 2004) (8 pages) doi:10.1115/1.1619426 History: Received December 01, 2001; Revised March 01, 2002; Online March 02, 2004
Copyright © 2004 by ASME
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Schematic of a periodic Rayleigh-pad with two-dimensional harmonic surface roughness (not to scale)
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Streamlines in the vicinity of the step
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Streamlines for two-dimensional flow near the step for τ=0.8 and Re=340
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Nondimensional pressures κ for Re=340 and roughness parameters τ=0.2 and 0.8 (incompressible case)
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Solutions for a moderate compressible smooth and rough Rayleigh-pad (smooth case: Λ=4.68 and Re=29.7, rough case: τ=0.2, Λ=5.06, Re=27.5)
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Load-carrying capacities for various two-dimensional roughness parameters τ (ξ/τ=2, incompressible case)
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Nondimensional load-carrying capacity for various Reynolds numbers (incompressible case)
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Closeup of mesh for full three-dimensional Rayleigh-pad simulation
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Surface gauge pressure contours for a Rayleigh-step with three-dimensional harmonic surface corrugations for the case τ=0.8, Re=125
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Comparison of moving surface pressure distributions for both two-dimensional and three-dimensional roughness for τ=0.8 and Re=125
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Typical tetrahedral mesh for a unit corrugation three-dimensional wavy surface (τ=0.8, Re=125)
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Typical velocity vector plot for a unit corrugation three-dimensional wavy surface (τ=0.8, Re=125)
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Load-carrying capacities for various roughness parameters τ (ξ /τ=5, incompressible case)



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