Effect of Wind Tunnel Acoustic Modes on Linear Oscillating Cascade Aerodynamics

[+] 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 116(3), 513-524 (Jul 01, 1994) (12 pages) doi:10.1115/1.2929440 History: Received March 01, 1993; Online June 09, 2008


The aerodynamics of a biconvex airfoil cascade oscillating in torsion is investigated using the unsteady aerodynamic influence coefficient technique. For subsonic flow and reduced frequencies as large as 0.9, airfoil surface unsteady pressures resulting from oscillation of one of the airfoils are measured using flush-mounted high-frequency-response pressure transducers. The influence coefficient data are examined in detail and then used to predict the unsteady aerodynamics of a cascade oscillating at various interblade phase angles. These results are correlated with experimental data obtained in the traveling-wave mode of oscillation and linearized analysis predictions. It is found that the unsteady pressure disturbances created by an oscillating airfoil excite wind tunnel acoustic modes, which have detrimental effects on the experimental results. Acoustic treatment is proposed to rectify this problem.

Copyright © 1994 by The American Society of Mechanical Engineers
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