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Effect of the Structural Coupling on the Flutter Onset of a Sector of Low-Pressure Turbine Vanes

[+] Author Affiliations
Ruben Antona, Carlos Martel

Universidad Politécnica de Madrid, Madrid, Spain

Roque Corral, Juan M. Gallardo

Industria de TurboPropulsores S.A., Madrid, Spain

Paper No. GT2010-23037, pp. 1235-1245; 11 pages
doi:10.1115/GT2010-23037
From:
  • ASME Turbo Expo 2010: Power for Land, Sea, and Air
  • Volume 6: Structures and Dynamics, Parts A and B
  • Glasgow, UK, June 14–18, 2010
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4401-4 | eISBN: 978-0-7918-3872-3
  • Copyright © 2010 by ASME

abstract

The effect of the structural coupling in the aeroelastic stability of a packet of low-pressure turbine vanes is studied in detail. The dynamics of a 3D sector vane is reduced to that of a simplified mass-spring model to enhance the understanding of its dynamics and to perform sensitivity studies. It is concluded that the dynamics of the simplified model retains the basic features of the finite element three-dimensional model. A linear fully coupled analysis in the frequency domain of the 3D vane sector has been conducted. It is concluded that the small structural coupling provided by the casing and the inter-stage seal is essential to explain the experimental evidences. It is shown that the use of fully coupled methods is necessary to retain the mode interaction that takes place in this type of configurations.

Copyright © 2010 by ASME

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