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TECHNICAL PAPERS

Influence of Rub-Grooves on Labyrinth Seal Leakage

[+] Author and Article Information
J. Denecke, V. Schramm, S. Kim, S. Wittig

Lehrstuhl und Institut für Thermische Strömungsmaschinen, Universität Karlsruhe (TH), 76128 Karlsruhe, Germany

J. Turbomach 125(2), 387-393 (Apr 23, 2003) (7 pages) doi:10.1115/1.1539516 History: Received October 15, 2001; Online April 23, 2003
Copyright © 2003 by ASME
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References

Steward,  P. A. E., and Brasnett,  K. A., 1978, “The Contribution of X-Ray to Gas Turbine Air Sealing Technology,” AGARD Conf. Proc., 237, pp. 10.1–10.13.
Zimmermann, H., and Wolff, K. H., 1998, “Air System Correlations: Part 1—Labyrinth Seals,” ASME Paper 98-GT-206.
Martin,  H. M., 1908, “Labyrinth Packings,” Eng. J., 85, pp. 33–36.
Rhode, D. L., and Allen, B. F., 1999, “Measurement and Visualization of Leakage Effects of Rounded Teeth Tips and Rub-Grooves on Stepped Labyrinths,” ASME Paper 99-GT-377.
Schramm,  V., Willenborg,  K., Kim,  S., and Wittig,  S., 2000, “Influence of a Honeycomb-Facing on the Flow Through a Stepped Labyrinth Seal,” ASME Paper 2000-GT-0291, ASME J. Eng. Gas Turbines Power, 124, pp. 140–146.
Weißenberger, E., 1952, “Strömung durch Spaltdichtungen,” Ph.D. thesis, Fakultät für Maschinenwesen, Universität Karlsruhe (TH).
Vermes,  G., 1961, “A Fluid Mechanics Approach to the Labyrinth Seal Leakage Problem,” ASME J. Eng. Power, 83, pp. 161–169.
Zimmermann, H., Kammerer, A., and Wolff, K. H., 1994, “Performance of Worn Labyrinth Seals,” ASME Paper 94-GT-131.
Stocker, H. L., Cox, D. M., and Holle, G. F., 1977, “Aerodynamic Performance of Conventional and Advanced Design Labyrinth Seals with Solid-Smooth, Abradable and Honeycomb Lands,” NASA-CR-135307.
Keller, C., 1934, Strömungsversuche an Labyrinthdichtungen für Dampfturbinen, Escher Wyss. Mitteilungen, Vol. 7, pp. 9–13.
Rhode, D. L., and Allen, B. F., 1998, “Visualization and Measurements of Rub-Groove Leakage Effects on Straight-Through Labyrinth Seals,” ASME Paper 98-GT-506.
Rhode, D. L., and Adams, R. G., 2000, “Computed Effect of Rub-Groove Size on Stepped Labyrinth Seal Performance,” ASME Paper 2000-GT-0292.
Willenborg,  K., Kim,  S., and Wittig,  S., 2001, “Effect of Reynolds Number and Pressure Ratio on Leakage Loss and Heat Transfer in a Stepped Labyrinth Seal,” ASME Paper 2001-GT-0123, ASME J. Turbomach. 123, pp. 815–822.
Willenborg,  K., Schramm,  V., Kim,  S., and Wittig,  S., 2000, “Influence of a Honeycomb Facing on the Heat Transfer in a Stepped Labyrinth Seal,” ASME Paper 2000-GT-0290, ASME J. Eng. Gas Turbines Power, 124, pp. 133–139.
Waschka,  W., Wittig,  S., and Kim,  S., 1992, “Influence of High Rotational Speeds on the Heat Transfer and Discharge Coefficients in Labyrinth Seals,” ASME J. Turbomach., 114, pp. 462–468.
Wittig,  S., Dörr,  L., and Kim,  S., 1983, “Scaling Effects on Leakage Losses in Labyrinth Seals,” ASME J. Eng. Power, 105, pp. 305–309.
Wittig,  S., Jacobsen,  K., Schelling,  U., and Kim,  S., 1988, “Heat Transfer in Stepped Labyrinth Seals,” ASME J. Eng. Gas Turbines Power, 110, pp. 63–69.

Figures

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Rub-grooves in engine labyrinth seals
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Geometry definition of rectangular grooves
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Labyrinth seal geometry definition (forward-facing steps)
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Labyrinth seal test facility
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Multi-exposure of tracking particles yields streamlines and flow direction
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Comparison to literature correlation
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Visualization of flow through a labyrinth seal with backward-facing steps, (s/t=0.057,bN/b=3.01,bN/tN=4.89)
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Visualization of flow through a labyrinth seal with backward-facing steps (s/t=0.0,bN/b=3.01,bN/tN=4.89)
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Discharge coefficients of straight through, backward-facing stepped and forward-facing stepped labyrinth seals with smooth stator or rub-grooves (bN/b=3,bN/tN=5,s/t=0.057)
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Influence of glearance on seal discharge coefficient CD
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Influence of the rub-groove depth tN at a constant width bN
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Influence of the rub-groove size bN/b at a constant shape bN/tN≈5

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