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Analysis of Finger Seal Lift Pads

[+] Author Affiliations
Peter P. Galimutti, Jerzy T. Sawicki, David P. Fleming

Cleveland State University, Cleveland, OH

Paper No. GT2009-59842, pp. 941-950; 10 pages
doi:10.1115/GT2009-59842
From:
  • ASME Turbo Expo 2009: Power for Land, Sea, and Air
  • Volume 6: Structures and Dynamics, Parts A and B
  • Orlando, Florida, USA, June 8–12, 2009
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4887-6 | eISBN: 978-0-7918-3849-5
  • Copyright © 2009 by ASME

abstract

Analyses were performed on finger seal pads having a pressure drop across the pad at right angles to the direction of runner velocity. The film was tapered; the clearance could decrease in both the pressure flow and velocity directions. A substantial load could be carried solely due to the pressure flow; however, the bearing exhibited negative stiffness without film convergence in the velocity flow direction. This is in marked contrast to a full circular bearing or ring seal, where pressure flow alone produces a significant stiffness as long as the clearance converges in the flow direction. The performance of three different pad configurations has been evaluated: aspect ratios L/B of 0.5, 1 (square pad), and 2. Design examples pertaining to each aspect ratio were studied for a gas turbine seal. Results show that lowest leakage, highest load carrying capacity, and highest stiffness are attained for the wide-pad configuration, L/B = 0.5. This paper presents a detailed study of the pad; additional analysis needs to be done for the inclusion of the finger and many other considerations for designing a complete seal.

Copyright © 2009 by ASME

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