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TECHNICAL PAPERS

Three-Dimensional CFD Rotordynamic Analysis of Gas Labyrinth Seals

[+] Author and Article Information
J. Jeffrey Moore

Dresser-Rand Co., Paul Clark Dr., Olean, NY 14760e-mail: jeff_moore@dresser-rand.com

J. Vib. Acoust 125(4), 427-433 (Oct 08, 2003) (7 pages) doi:10.1115/1.1615248 History: Received June 01, 2003; Online October 08, 2003
Copyright © 2003 by ASME
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References

Iwatsubo, T., 1980, “Evaluation of Instability Forces of Labyrinth Seals in Turbines or Compressors,” Proceedings of Rotordynamic Instability Problems in High Performance Turbomachinery, NASA CP-2133, Texas A&M University, pp. 139–167.
Childs,  D. W., Scharrer,  J. K., 1986, “An Iwatsubo Based Solution for Labyrinth Seals: A Comparison to Experimental Results,” ASME J. Eng. Gas Turbines Power, 108, pp. 325–331.
Kirk,  R. G., 1988, “Evaluation of Aerodynamic Instability Mechanisms for Centrifugal Compressors—Part II: Advanced Analysis,” ASME J. Vibr. Acoust., 110, April, pp. 207–212.
Marquette, O., Childs, D. W., and Philips, S. G., 1997, “Theory Versus Experiments for Leakage and Rotordynamic Coefficients of Circumferetially-Grooved Liquid Annular Seals with L/D of 0.45,” ASME Paper No. FED SM97-3333, Proceedings of the 1997 ASME Fluids Engineering Division Summer Meeting, June 22–26.
Dietzen,  F. J., and Nordmann,  R., 1987, “Calculating Rotordynamic Coefficients of Seals by Finite-Difference Techniques,” ASME J. Tribol., 109, pp. 388–394.
Arghir,  M., and Frene,  J., 1997, “Rotordynamic Coefficients of Circumferentially-Grooved Liquid Seals Using the Averaged Navier-Stokes Equations,” ASME J. Tribol., 119, pp. 556–567.
Kim, N., and Rhode, D. L., 2000, “A New CFD-Perturbation Model For The Rotordynamics of Incompressible Flow Seals,” ASME International Gas Turbine and Aeroengine Congress and Exposition, May 8–11, Munich, Germany.
Tam,  L. T., Przekwas,  A. J., Muszynska,  A., Hendricks,  R. C., Braun,  M. J., and Mullen,  R. L., 1988, “Numerical and Analytical Study of Fluid Dynamic Forces in Seals and Bearings,” ASME J. Vibr. Acoust., 110, pp. 315–325.
Nordmann, R., and Dietzen, F. J., 1988, “Finite Difference Analysis of Rotordynamic Seal Coefficients For An Eccentric Shaft Position,” NASA CP 3026.
Rhode,  D. L., Hensel,  S. J., and Guidry,  M. J., 1992, “Labyrinth Seal Rotordynamic Forces Using a Three-Dimensional Navier-Stokes Code,” ASME J. Tribol., 114, pp. 683–689.
Athevale, M. M., Przekwas, A. J., Hendricks, R. C., and Liang, A., 1994, “SCISEAL: A 3D CFD Code for Accurate Analysis of Fluid Flow and Forces in Seals,” Proceedings of the Advanced ETO Propulsion Conference, NASA CP3282, NASA Marshall Space Flight Center, May, Huntsville, AL, pp. 337–345.
Moore,  J. J., and Palazzolo,  A. B., 1999, “CFD Comparison to 3D Laser Anemometer and Rotordynamic Force Measurements for Grooved Liquid Annular Seals,” ASME J. Tribol., 121, No. 2, pp. 307–314.
Moore, J. J., and Palazzolo, A. B., 1999, “Rotordynamic Force Prediction of Centrifugal Impeller Shroud Passages Using Computational Fluid Dynamic Techniques,” ASME International Gas Turbine and Aeroengine Congress and Exposition, June 9–12, Indianapolis, Indiana.
Kwanka, K., Sobotzik, J., and Nordmann, R., 2000, “Dynamic Coefficients Of Labyrinth Gas Seals A Comparison Of Experimental Results And Numerical Calculations,” ASME International Gas Turbine and Aeroengine Congress and Exposition, May 8–11, Munich, Germany.
Athavale M. M., and Przekwas, A. J., SCISEAL Manual, 1995, “SCISEAL: A Computer Program for Study of Fluid Dynamic Forces in Seals,” Developed under contract by NASA Lewis Research Center (NAS3-25644).
Pelletti, J., 1990, “A Comparison of Experimental Results and Theoretical Predictions for the Rotordynamic Coefficients of Short (L/D=1/6) Labyrinth Seals,” M.S.M.E. Thesis, Texas A&M University and Turbomachinery Laboratory Report No. TL-Seal-1-90.

Figures

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2D grid for inlet, 1st tooth, and cavity
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3D labyrinth seal model
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Mesh density study (meridional)
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Mesh density study (circumferential)
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Velocity vectors in labyrinth seal cavity
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Static pressure distribution through seal
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Circumferential swirl prediction upstream of seal (dark=high swirl)
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Streaklines through seal
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Circumferential pressure distribution
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Tangential impedance, Pr=0.403, 16 krpm, Seal-Only
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Tangential impedance, Pr=0.65, 16 krpm, Γs=0, Seal Only
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Comparison of seal models, 16 krpm, Pr=0.403,Γs=0
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Effect of seal clearance, Pr=0.398, 16 krpm, Γs=0, up-seal model
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18 tooth labyrinth seal
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Velocity vectors, DR 18 tooth Laby
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Static pressure tap measurement vs. prediction for 18 tooth DR Laby, 0 rpm
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Static pressure tap meas. vs. prediction for 18 tooth DR Laby, 15 krpm

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