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TECHNICAL PAPERS: Gas Turbines: Heat Transfer

Measurement and Visualization of Leakage Effects of Rounded Teeth Tips and Rub-Grooves on Stepped Labyrinths

[+] Author and Article Information
D. L. Rhode, B. F. Allen

Mechanical Engineering Department, Texas A&M University, College Station, TX 77843

J. Eng. Gas Turbines Power 123(3), 604-611 (Aug 01, 2000) (8 pages) doi:10.1115/1.1377873 History: Received March 01, 1999; Revised August 01, 2000
Copyright © 2001 by ASME
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References

Zimmermann, H., Kammerer, A., and Wolff, K. H., 1994, “Performance of Worn Labyrinth Seals,” ASME Paper 94-GT-131.
Sneck,  H. J., 1974, “Labyrinth Seal Literature Survey,” Journal of Lubrication Technology,96, pp. 579–582.
Rhode,  D. L., Broussard,  D. H., and Veldanda,  S. B., 1993, “Labyrinth Seal Leakage Resistance and Visualization Experiments in a Novel, Variable-Configuration Facility,” Tribol. Trans., 36, pp. 213–218.
Stocker, H. L., 1975, “Advanced Labyrinth Seal Design Performance for High Pressure Ratio Gas Turbines,” ASME Paper 75-WA/GT-22.
Jerie, J., 1948, “Flow Through Straight-Through Labyrinth Seals,” Proceedings of the Seventh Annual International Congress for Applied Mechanics, Vol. 2, ASME, New York, pp. 70–82.
Egli,  A., 1935, “The Leakage of Steam Through Labyrinth Seals,” Trans. ASME, 57, pp. 115–122.
Rhode,  D. L., Johnson,  J. W., and Broussard,  D. H., 1997, “Flow Visualization and Leakage Measurements of Stepped Labyrinth Seals; Part 1: Annular Groove,” ASME J. Turbomach., 119, pp. 839–843.
Rhode,  D. L., Younger,  J. S., and Wernig,  M. D., 1997, “Flow Visualization and Leakage Measurements of Stepped Labyrinth Seals; Part 2: Sloping Surfaces,” ASME J. Turbomach., 119, pp. 844–848.
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.
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, Detroit Diesel Allison, Indianapolis, IN.
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.
Rao,  C. K. V., and Narayanamurthi,  R. G., 1973, “An Experimental Study of Performance Characteristics of Labyrinth Seals,” Mech. Eng. (Am. Soc. Mech. Eng.), 53, pp. 277–281.
Kline,  S. J., and McClintock,  F. A., 1953, “Describing Uncertainties in Single-Sample Experiments,” Mech. Eng. (Am. Soc. Mech. Eng.), 75, pp. 3–9.
Vermes,  G., 1961, “A Fluid Mechanics Approach to the Labyrinth Seal Leakage Problem,” ASME J. Eng. Gas Turbines Power, 83, pp. 161–169.
Rhode, D. L., Johnson, J. W., and Allen, B. F., 1997, “Effect of Flow Instabilities and Self-Sustained Oscillations on Labyrinth Seal Leakage Resistance,” ASME Paper 97-GT-214.

Figures

Grahic Jump Location
Cutaway view of the very large-scale test section showing the flow visualization windows
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Test seal for the grooved-worn-teeth case of small clearance c=0.064 cm (0.25 in.) and small step height s=4.45 cm (1.75 in.)
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Leakage resistance coefficient versus Re; small clearance c=0.064 cm (0.25 in.) and large step height s=8.26 cm (3.25 in.)
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Digital image of grooved-worn-teeth case; small clearance c=0.064 cm (0.25 in.) and large step height s=8.26 cm (3.25 in.)
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Magnified digital image of grooved-worn-teeth tips; small clearance c=0.064 cm (0.25 in.) and large step height s=8.26 cm (3.25 in.)
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Magnified digital image of grooved-unworn-teeth tips; small clearance c=0.064 cm (0.25 in.) and large step height s=8.26 cm (3.25 in.)
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Digital image of ungrooved-worn-teeth case; small clearance c=0.064 cm (0.25 in.) and large step height s=8.26 cm (3.25 in.)
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Digital image of grooved-unworn-teeth case; small clearance c=0.064 cm (0.25 in.) and large step height s=8.26 cm (3.25 in.)
Grahic Jump Location
Leakage resistance coefficient versus Re; small clearance c=0.064 cm (0.25 in.) and small step height s=4.45 cm (1.75 in.)
Grahic Jump Location
Leakage resistance coefficient versus Re; medium clearance c=1.91 cm (0.75 in.) and large step height s=8.26 cm (3.25 in.)
Grahic Jump Location
Leakage resistance coefficient versus Re; medium clearance c=1.91 cm (0.75 in.) and small step height s=4.45 cm (1.75 in.)
Grahic Jump Location
Digital image of grooved-worn-teeth case; medium clearance c=1.91 cm (0.75 in.) and small step height s=4.45 cm (1.75 in.)
Grahic Jump Location
Leakage resistance coefficient versus Re; large clearance c=2.54 cm (1.0 in.) and large step height s=8.26 cm (3.25 in.)
Grahic Jump Location
Leakage resistance coefficient versus Re; large clearance c=2.54 cm (1.0 in.) and small step height s=4.45 cm (1.75 in.)

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