Vibratory Forcing Functions Produced by Nonuniform Cascades

[+] Author and Article Information
T. J. Barber, H. D. Weingold

Compressor Group, Pratt and Whitney Aircraft, East Hartford, Conn.

J. Eng. Power 100(1), 82-88 (Jan 01, 1978) (7 pages) doi:10.1115/1.3446330 History: Received December 20, 1976; Online July 14, 2010


A method is developed to predict the steady, two-dimensional incompressible flowfield through tandem cascades or multibody cascade geometries. The technique is adapted from the classical Douglas-Neumann method, in which a superposition of singularities is used to simulate the cascade geometries. The method is used to analyze the self-induced potential field interaction of a stator cascade with a finite thickness strut cascade behind it or integral within it, such as occurs in fan ducts and intermediate cases of large gas-turbine engines. The calculation predicts the magnitude and location of the nonuniform pressure distortion, which would be imposed on an upstream engine component, for a variety of cascade designs. Such a distortion is known to produce resonant stresses in an upstream rotor. Experimental corroboration of the analysis is presented for a cascade operating at M∞ = 0.49. Sensitivity of the distortion pattern to small strut restaggering is calculated and compared to test data.

Copyright © 1978 by ASME
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