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Labyrinth Seal Discharge Coefficient for Rectangular Cavities

[+] Author Affiliations
Saikishan Suryanarayanan, Gerald L. Morrison

Texas A&M University, College Station, TX

Paper No. FEDSM2009-78152, pp. 99-114; 16 pages
doi:10.1115/FEDSM2009-78152
From:
  • ASME 2009 Fluids Engineering Division Summer Meeting
  • Volume 2: Fora
  • Vail, Colorado, USA, August 2–6, 2009
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-4373-4 | eISBN: 978-0-7918-3855-6
  • Copyright © 2009 by ASME

abstract

A labyrinth seal leakage prediction equation can be developed by considering the seal as a series of orifices and cavities. CFD simulations are used to investigate the discharge coefficient’s dependence of each tooth upon the seal geometry and flow conditions for multi-toothed, teeth on stator, straight through labyrinth seals with rectangular cavities. The discharge coefficient for the first tooth of the labyrinth seal was found to be a function of tooth width to clearance ratio and Reynolds number. It was found that the ratio of the discharge coefficients of a downstream tooth of the labyrinth seal to that of the inlet tooth is a function of the carry over coefficient. The carry over coefficient is a measure of the amount of kinetic energy entering a cavity that is dissipated by turbulence in the cavity. It was observed that the expansion factor (compressibility effect) is a function of tooth pressure ratio. The models developed in this paper for discharge coefficient and expansion factor coupled with the carry over coefficient model presented in our earlier work provide a leakage prediction algorithm that is validated against prior experiments.

Copyright © 2009 by ASME

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