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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Dynamic Coefficients of Stepped Labyrinth Gas Seals

[+] Author and Article Information
Klaus Kwanka

Technische Universität München, Munich, Germany

J. Eng. Gas Turbines Power 122(3), 473-477 (May 15, 2000) (5 pages) doi:10.1115/1.1287033 History: Received March 09, 1999; Revised May 15, 2000
Copyright © 2000 by ASME
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References

Thomas,  H.-J., 1958, “Instabile Eigenschwingungen von Turbinenläufern, angefacht durch die Spaltströmungen in den Stopfbuchsen und Beschaufelungen,” Bull. de AIM 71, pp. 1039–1063.
Alford,  J. S., 1965, “Protecting Turbomachinery From Self-Excited Rotor Whirl,” ASME J. Eng. Gas Turbines Power, 87, pp. 333–344.
Childs, D. W., 1993, Turbomachinery Rotordynamics, Wiley, New York.
Wagner, N. G., and Steff, K., 1996, “Dynamic Labyrinth Coefficients From a High-Pressure Full-Scale Test Rig Using Magnetic Bearings,” NASA Conference Publication to be published, proceedings of a workshop held at Texas A&M University, College Station, TX, May 6–8, 1996.
Childs,  D. W., Nelson,  C. E., Nicks,  C., Scharrer,  J., Elrod,  D., and Hale,  K., 1986, “Theory Versus Experiment for the Rotordynamic Coefficients of Annular Gas Seals: Part 1–Test Facility and Apparatus,” ASME J. Tribol., 108, pp. 426–432.
Hawkins,  L., Childs,  D., and Hale,  K., 1989, “Experimental Results for Labyrinth Gas Seals with Honeycomb Stators: Comparison to Smooth-Stator Seals an Theoretical Predictions,” ASME J. Tribol., 111, pp. 161–168.
Yu, Z., and Childs, D., 1996, “A Comparison of Rotordynamic Coefficients and Leakage Characteristics for Hole-Pattern Gas Damper Seals and Honeycomb Seal,” NASA Conference Publication to be published, proceedings of a workshop held at Texas A&M University, College Station, TX, May 6–8, 1996.
Wright, D. V., 1983, “Labyrinth Seal Forces on a Whirling Rotor, ASME Applied Mechanics Division,” Proceedings of a Symposium on Rotor Dynamical Instability, Vol. 55, Adams, M. L., Jr., ed., ASME, New York, pp. 19–31.
Millsaps, K. T., and Martinez-Sanches, M., 1993, “Rotordynamic Forces in Labyrinth Seals: Theory and Experiment,” NASA Conference Publication 3239, proceedings of a workshop held at Texas A&M University, College Station, TX, pp. 179–207.
Matros, M., Neumer, T., and Nordmann, R., 1994, “Identification of Rotordynamic Coefficients of Centrifugal Pump Components Using Magnetic Bearings,” Preprints of the Fifth International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC-5), May 8–11, 1994, Kaanapali, Hawaii, USA, pp. 55–72.
Wagner, N. G., and Pietruszka, W. D., 1988, “Identification of Rotordynamic Parameters on a Test Stand With Magnetic Bearings,” Magnetic Bearings Proceedings of the First International Symposium, ETH Zürich, Schweitzer, G., ed., Springer Verlag, New York, pp. 289–299.
Kwanka, K., and Mair, R., 1995, “Identification of Gas Seal Dynamic Coefficients Based on the Stability Behavior of a Rotor,” Proceedings of the 1st European Conference of Turbomachinery—Fluid Dynamic and Thermodynamic Aspects, March 1–3, Erlangen-Nürnberg, Germany, VDI-Report 1186, pp. 297–309.
Ulbrich, H., 1988, “New Test Techniques Using Magnetic Bearings,” Magnetic Bearings Proceedings of the First International Symposium, ETH Zürich, Schweitzer, G., ed., Springer Verlag, New York, pp. 281–288.
Kwanka, K., and Nagel, M., 1996, “Experimental Rotordynamic Coefficients of Short Labyrinth Gas Seals,” NASA Conference Publication to be published, proceedings of a workshop held at Texas A&M University, College Station, TX, May 6–8, 1996, pp. 135–144.
Kwanka, K., 1997, “Rotordynamic Impact of Swirl Brakes on Labyrinth Seals with Smooth or Honeycomb Stators,” ASME Paper 97-GT-232.
Kwanka, K., 1995, “Variation of Fluid Flow Forces in Seals With Rotor Bending,” DE-Vol. 84-2, 1995 Design Eng. Technical Conf., Vol. 3-Part B, ASME, New York, pp. 1277–1282.
Kwanka, K., 1998, “Influence of Labyrinth Seal Geometry on Rotordynamic Coefficients,” Proceedings of the Fifth International Conference on Rotor Dynamics (IFToMM), Irretier, H., and Nordmann, R., ed., Vieweg Verlag, pp. 241–251.

Figures

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Jeffcott rotor with test seal and magnetic bearing
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Change in stability of the forward and the backward mode caused by the seal
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Identification of the cross-coupled stiffness and the direct damping
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Spiral orbit of the unstable eigen-vibration
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Identification of the cross-coupled stiffness and the direct damping (dots=measurement;lines=curve fitting)
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Test rig for the identification of dynamic coefficients
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(a) Geometrical data of the stepped labyrinth seal (STS14); (b) geometrical data of the tooth on stator labyrinth seal (TOS24).
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Leakage loss of labyrinth seal versus the pressure difference (n=750 rpm)
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Leakage rate in dependence of the entry swirl
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Nonconservative dynamic coefficients of a stepped labyrinth seal
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Conservative dynamic coefficients of a stepped labyrinth seal
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Comparison of a stepped and a tooth-on-stator seal

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