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
Your Session has timed out. Please sign back in to continue.





Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In