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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

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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