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Comparison Between Weak and Strong Coupling Modeling for Aeroelastic Stability of a Simple Sealing Device

[+] Author Affiliations
Nicolas de Cacqueray

Snecma, Moissy-Cramayel, France

Martin Seive, Alain Kernilis

Snecma, Vernon, France

Paper No. GT2016-57752, pp. V07BT34A021; 10 pages
doi:10.1115/GT2016-57752
From:
  • ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition
  • Volume 7B: Structures and Dynamics
  • Seoul, South Korea, June 13–17, 2016
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4984-2
  • Copyright © 2016 by ASME

abstract

In the present paper, a strong coupling and two weak coupling approaches are compared to estimate the aeroelastic stability of a simple sealing system. This test configuration, directly inspired from clarinet modeling [19], combines a valve, represented by a single degree of freedom mechanical element, and an axial acoustic cavity. It displays aeroelastic instabilities due to interactions between mechanical and acoustic modes. The strong coupling (SC) computes directly the eigenmodes of the discrete problem and it is used as the reference solution. The numerical solver is based on low-dissipation and low-dispersion schemes combined with a selective filter. The first weak coupling approach presented here is named the flutter-like weak coupling (FWC), and it is derived from a blade flutter methodology employed in the industry. The second weak coupling method is called the resonator weak coupling (RWC), and it uses a coupling between the mechanical and the acoustic modes. The FWC fails to provide the stability of the present test configuration, whereas the RWC gives better results. However, the assumption made at the junction between the valve and the cavity is a critical issue for the RWC. The number of acoustic modes considered in this model can also impact the results.

Copyright © 2016 by ASME

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