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Prediction of Turbine Blade Vibratory Response due to Upstream Vane Distress PUBLIC ACCESS

[+] Author Affiliations
Josef Panovsky, Scott M. Carson

GE Aircraft Engines, Cincinnati, OH

Paper No. 97-GT-250, pp. V004T14A050; 7 pages
doi:10.1115/97-GT-250
From:
  • ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award
  • Orlando, Florida, USA, June 2–5, 1997
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7871-2
  • Copyright © 1997 by ASME

abstract

Turbine blades and vanes operate in a hostile environment which leads to deterioration of these components overtime. This paper describes detailed calculations to predict the vibratory response of a high-pressure turbine blade due to the excitation produced by a single distressed upstream vane in a modern turbofan engine. The approach includes detailed computational fluid dynamics (CFD) analysis of the steady flow field produced by the distressed vane, Fourier decomposition of the flow variables to determine the harmonic content, unsteady CFD analysis to determine the resulting vibratory response of the blade, and crack propagation analysis to determine blade life. Predictions of vibratory stress and threshold crack size are summarized as functions of vane distress level. The results, which indicate that this type of vane distress can indeed be a significant excitation source for the blades, are shown to be in good agreement with engine experience. The method provides, for the first time, a quantitative approach to setting limits for acceptable levels of vane distress in the field.

Copyright © 1997 by ASME
Topics: Turbine blades
This article is only available in the PDF format.

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