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RESEARCH PAPERS

Further Developments in the Aerodynamic Analysis of Unsteady Supersonic Cascades—Part 2: Aerodynamic Response Predictions

[+] Author and Article Information
J. M. Verdon

Aeroelastics Group, United Technologies Research Center, East Hartford, Conn.

J. Eng. Power 99(4), 517-525 (Oct 01, 1977) (9 pages) doi:10.1115/1.3446545 History: Received December 17, 1976; Online July 14, 2010

Abstract

This paper is the second of a two-part report on a theoretical analysis of the aerodynamic response to an oscillating supersonic cascade in subsonic axial flow. Supersonic resonance criteria are discussed and lead to the distinction between subresonant and superresonant cascade motions. Numerical predictions, based on the unsteady solution reported in Part 1, are presented for two typical cascade configurations. These reveal the possibility of both subresonant and superresonant single-degree-of-freedom torsional instabilities. Subresonant instabilities occur over a broad range of frequencies and interblade phase angles, whereas superresonant instabilities occur only over a narrow range of such cascade parameter values. For a given blade motion frequency and free-stream Mach number, it appears that the least stable condition will usually lie in the subresonant region.

Copyright © 1977 by ASME
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