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.
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July 1994
Research Papers
Effect of Wind Tunnel Acoustic Modes on Linear Oscillating Cascade Aerodynamics
D. H. Buffum,
D. H. Buffum
NASA Lewis Research Center, Cleveland, OH 44135
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S. Fleeter
S. Fleeter
Thermal Sciences and Propulsion Center, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907
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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. Jul 1994, 116(3): 513-524 (12 pages)
Published Online: July 1, 1994
Article history
Received:
March 1, 1993
Online:
June 9, 2008
Citation
Buffum, D. H., and Fleeter, S. (July 1, 1994). "Effect of Wind Tunnel Acoustic Modes on Linear Oscillating Cascade Aerodynamics." ASME. J. Turbomach. July 1994; 116(3): 513–524. https://doi.org/10.1115/1.2929440
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