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TECHNICAL BRIEF

Analytical Prediction Techniques for Axisymmetric Flow in Gas Labyrinth Seals

[+] Author and Article Information
U. Yucel, J. Y. Kazakia

Lehigh University, Department of Mechanical Engineering and Mechanics, 19 Memorial Drive West, Bethlehem, PA 18015-3085

J. Eng. Gas Turbines Power 123(1), 255-257 (May 12, 2000) (3 pages) doi:10.1115/1.1340630 History: Received April 18, 2000; Revised May 12, 2000
Copyright © 2001 by ASME
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References

Childs, D., 1993, Turbomachinery Rotordynamics Phenomena, Modeling, and Analysis, John Wiley and Sons, New York, pp. 290–354.
Childs,  D., and Scharrer,  J. K., 1986, “An Iwatsubo-Based Solution for Labyrinth Seals: Comparison to Experimental Results,” J. Eng. Gas Turbines Power, 108, pp. 325–331.
Eser,  D., and Kazakia,  J. Y., 1995, “Air Flow in Cavities of Labyrinth Seals,” Int. J. Eng. Sci., 33, No. 15, pp. 2309–2326.
Yucel, U., 1996, “Leakage and Swirl Velocities in Labyrinth Seals,” Masters thesis, Lehigh University, Bethlehem, PA.
Benvenuti, E., Ruggeri, G., and Tomasini, E. P., 1980, “Analytical and Experimental Development of Labyrinth Seals for Process Centrifugal Compressors,” Performance Prediction of Centrifugal Pumps and Compressors, ASME, New York, pp. 21–34.
Brownell,  J. B., Millward,  J. A., and Parker,  R. J., 1989, “Nonintrusive Investigations Into Life-Size Labyrinth Seal Flow Fields,” J. Eng. Gas Turbines Power, 111, pp. 335–342.
Gurevich, M. I., 1966, The Theory of Jets in an Ideal Fluid, Pergamon, New York, pp. 319–323.
Kwanka, K., and Nagel, M., (1996), “Experimental Rotordynamic Coefficients of Short Labyrinth Gas Seals,” NASA Conference Publication 3344: Rotordynamic Instability Problems in High-Performance Turbomachinery, Texas A&M University, College Station, TX, pp. 135–144.
Rosen, M. C., 1986, “Calculation of Leakage and Stiffness/Damping Coefficients for Compressible Flow in Straight-Through and Interlocking Labyrinth Seals,” Report No. UVA/643092/MAE86/346, University of Virginia, Charlottesville, VA, p. 16.

Figures

Grahic Jump Location
The dependence of the mass flow number G on the pressure ratio r=Pout/Pin. Analytical (present), numerical and experimental results are compared for two different seals. Case A refers to a five-tooth seal used by Brownell et al. 6, case B refers to a twelve-tooth seal used by Benvenuti et al. 5.
Grahic Jump Location
The flow coefficient variation with pressure. Formula used in numerical results is compared with formula used for semi-analytical approach.

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