Prediction of Turbine Blade Vibratory Response Due to Upstream Vane Distress

[+] Author and Article Information
J. Panovsky, S. M. Carson

GE Aircraft Engines, Cincinnati, OH 44135

J. Turbomach 120(3), 515-521 (Jul 01, 1998) (7 pages) doi:10.1115/1.2841748 History: Received February 01, 1997; Online January 29, 2008


Turbine blades and vanes operate in a hostile environment, which leads to deterioration of these components over time. 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 flowfield 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 © 1998 by The American Society of Mechanical Engineers
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