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RESEARCH PAPERS

Wind Tunnel Wall Effects in a Linear Oscillating Cascade

[+] Author and Article Information
D. H. Buffum

NASA Lewis Research Center, Cleveland, OH 44135

S. Fleeter

Thermal Sciences and Propulsion Center, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907

J. Turbomach 115(1), 147-156 (Jan 01, 1993) (10 pages) doi:10.1115/1.2929199 History: Received February 20, 1991; Online June 09, 2008

Abstract

Experiments in a linear oscillating cascade reveal that the wind tunnel walls enclosing the airfoils have, in some cases, a detrimental effect on the oscillating cascade aerodynamics. In a subsonic flow field, biconvex airfoils are driven simultaneously in harmonic, torsion-mode oscillations for a range of interblade phase angle values. It is found that the cascade dynamic periodicity—the airfoil-to-airfoil variation in unsteady surface pressure—is good for some values of interblade phase angle but poor for others. Correlation of the unsteady pressure data with oscillating flat plate cascade predictions is generally good for conditions where the periodicity is good and poor where the periodicity is poor. Calculations based upon linearized unsteady aerodynamic theory indicate that pressure waves reflected from the wind tunnel walls are responsible for the cases where there is poor periodicity and poor correlation with the predictions.

Copyright © 1993 by The American Society of Mechanical Engineers
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