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Vortical Patterns in the Wake of an Oscillating Airfoil

Koochesfahani, M. M. (1987) Vortical Patterns in the Wake of an Oscillating Airfoil. In: 25th AIAA Aerospace Sciences Meeting. AIAA , New York, NY.

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The vortical flow patterns in the wake of a NACA 0012 airfoil pitching at small amplitudes are studied in a low speed water channel. it is shown that a great deal of control can be exercised on the structure of the wake by the control of the frequency, amplitude and also the shape of the oscillation waveform. An important observation in this study has been the existence of an axial flow along the cores of the wake vortices. Estimates of the magnitude of the axial flow suggest a linear dependence on the oscillation frequency and amplitude.

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Additional Information:© 1987 American institute of Aeronautics and Astronautics. AIAA-87-0111. I am indebted to colleagues at GALCIT for many helpful discussion, suggestions and ideas. The constant support and encouragement by Professor Paul Dimotakis and Dr. Jim McMichael are very much appreciated. Thanks are also due to Dr. Bill Ashurst for many useful discussions. The help provided by Mr. Cliff Frieler during the experiment and also with the manuscript is gratefully acknowledged. This work was supported by the Air Force Office of Scientific Research Grant no. AFOSR-84-0120.
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Air Force Office of Scientific Research (AFOSR)AFOSR-84-0120
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ID Code:50967
Deposited On:28 Oct 2014 23:39
Last Modified:10 Nov 2021 19:03

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