0

Full Content is available to subscribers

Subscribe/Learn More  >

Numerical Investigation of Labyrinth Seal Aeroelastic Stability

[+] Author Affiliations
R. Phibel, L. di Mare

Imperial College London, London, UK

J. S. Green

Rolls Royce plc; Imperial College, Derby, UK

M. Imregun

Imperial College, London, UK

Paper No. GT2009-60017, pp. 573-583; 11 pages
doi:10.1115/GT2009-60017
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 Rolls-Royce plc

abstract

Labyrinth seals, used to prevent flow leakage between rotating and stationary components in aero engines, may be prone to aeroelastic instabilities. Current work investigates the aeroelastic stability of flexible seals using a coupled fluid-structure code. The aim is to determine the key parameters and to explain the flutter mechanism with a view to establish simple design rules. The unsteady flow field due to seal vibration is solved in a time accurate manner to determine the aerodynamic damping of the seal. The fluid model is based on non-linear time-accurate unsteady Reynolds-averaged Navier-Stokes equations. The vibrating structure is modelled using a classical modal approach. The parameters investigated are the influence of the seal natural frequencies and the support position for the seal. The geometry considered is a multi-finned straight-through seal. A ten-degree sector is meshed for the simulations, and cyclic symmetry boundary conditions are used. The stability is found to be affected by both the mechanical/acoustic frequency ratio and the support side of the seal. The aerodynamic work depends mainly on the cavity shape, the mode shape and the unsteady pressure phase distribution. It is found that the phase variation from one cavity to another is of primary importance to assess the relative contribution of each cavity to the aerodynamic work. The results agree qualitatively with those available in the literature.

Copyright © 2009 by Rolls-Royce plc
Topics: Stability

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In