Labyrinth Seal Force Coefficients for Small Motion of the Rotor About an Arbitrary Eccentricity Position PUBLIC ACCESS

[+] Author Affiliations
C. Rajakumar

Swanson Analysis Systems, Inc., Houston, PA

F. Sisto

Stevens Institute of Technology, Hoboken, NJ

Paper No. 87-GT-194, pp. V005T13A009; 10 pages
  • ASME 1987 International Gas Turbine Conference and Exhibition
  • Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Process Industries; General
  • Anaheim, California, USA, May 31–June 4, 1987
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7927-6
  • Copyright © 1987 by ASME


Labyrinth seal force coefficients have been calculated for arbitrary eccentricity position of the rotor center with respect to the seal center. By solving the steady seal flow governing equations for known eccentricities, the circumferential pressure and velocity distributions are obtained. For a perturbation motion of the rotor about the steady eccentric position, the momentum and continuity equations of the seal flow are linearized. The resulting linear partial differential equations have been solved to get the perturbation pressures that are proportional to the rotor center motion along two orthogonal coordinate directions, which when integrated over the rotor surface yield the required force coefficients. Comparison of the stiffness coefficients obtained were made with published experimental results. In addition, the stiffness coefficients have been verified by comparing with the seal forces calculated for large eccentricity ratios. The results also include the damping coefficients that result due to the rotor center motion.

Copyright © 1987 by ASME
Topics: Rotors
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