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Direct Use of Unsteady Aerodynamic Pressures in the Flutter Analysis of Mistuned Blades PUBLIC ACCESS

[+] Author Affiliations
A. V. Srinivasan

University of Connecticut, Storrs, CT

G. G. Tavares

Pratt and Whitney Aircraft, East Hartford, CT

Paper No. 94-GT-347, pp. V005T14A042; 7 pages
doi:10.1115/94-GT-347
From:
  • ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; General
  • The Hague, Netherlands, June 13–16, 1994
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7887-3
  • Copyright © 1994 by ASME

abstract

An aeroelastic stability analysis of a cascade of engine blades coupled only through aerodynamica is developed. The unique feature of the analysis is the direct use of unsteady aerodynamic pressures, rather than lifts and moments, in calculating the susceptibility of a cascade to flutter. The approach developed here is realistic and relevant for analysis of low aspect ratio blades. However, in the calculations presented in this paper, the surface is assumed to be divided into equal elemental areas. The formulation leads to a complex eigenvalue problem, the solution of which determines the susceptibility of the cascade to flutter. The eigenvalues of an assembly of alternately mistuned blades, operating at high reduced frequencies, appear to be very sensitive to the level of mistuned frequencies. The locus of eigenvalues shows a strong tendency to split even for very small percentage differences between the frequencies of the two sets of blades. Further, blades with identical frequencies, but alternately mistuned mode shapes, operating at high reduced frequencies show a tendency towards instability.

Copyright © 1994 by ASME
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