A Comparative Investigation of Corresponding Annular and Labyrinth Seal Flowfields PUBLIC ACCESS

[+] Author Affiliations
D. L. Rhode, R. I. Hibbs

Texas A&M University, College Station, TX

Paper No. 89-GT-195, pp. V001T01A079; 7 pages
  • ASME 1989 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 1: Turbomachinery
  • Toronto, Ontario, Canada, June 4–8, 1989
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7913-9
  • Copyright © 1989 by ASME


A previous Navier-Stokes finite difference computer code is extended in order to compute seal leakage directly from given upstream and downstream reservoir pressures. The numerical results are in excellent agreement with previous measurements, the discrepancy being less than eight percent. Annual seals are found to leak approximately twenty percent more than corresponding labyrinths over the entire range of realistic clearance. A rather unexpected finding is that a dramatic increase of swirl velocity occurs near the discharge of small clearance annular seals, which does not arise in corresponding labyrinth seals. The results, which are used to explain this finding, show that a large density drop occurs near the small clearance annular seal exit, which provides the swirl velocity increase in accordance with angular momentum conservation.

Copyright © 1989 by ASME
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