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Further experiments on vortex formation around an oscillating and translating airfoil at large incidences

Published online by Cambridge University Press:  26 April 2006

Kazuo Ohmi ,
Madeleine Coutanceau ,
Olivier Daube  and
Ta Phuoc Loc
Kazuo Ohmi
Affiliation:
Osaka University, Faculty of Language and Culture, Osaka 560, Japan
Madeleine Coutanceau
Affiliation:
Laboratoire de Mécanique des Fluides, Université de Poitiers, 86022 Poitiers Cedex, France
Olivier Daube
Affiliation:
Laboratoire d'Informatique pour la Mécanique et les Sciences de l'Ingénieur, 91403 Orsay Cedex, France
Ta Phuoc Loc
Affiliation:
Laboratoire d'Informatique pour la Mécanique et les Sciences de l'Ingénieur, 91403 Orsay Cedex, France
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Abstract

The starting flows past a two-dimensional NACA 0012 airfoil translating and oscillating at large incidences are investigated by visualization experiments and numerical calculations. The airfoil model is set in motion impulsively and subjected simultaneously to a constant translation and harmonic oscillation in pitch. The evolution of the vortex wake is followed in a sequence of streamline visualizations and the wake pattern generated is analysed. The parameters varied in the visualization experiment are the Reynolds number ranging from 1500 to 10000, the reduced frequency from 0.1 to 1.0, the mean incidence 30° or 15° and the angular amplitude 15° or 7°. There are also two additional parameters of special interest: the airfoil cross-section and the pitching axis. The effects of these parameters are discussed in relation to the resultant wake patterns. Some comparison is made with the results of earlier experiments.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 225 , April 1991 , pp. 607 - 630
Copyright
© 1991 Cambridge University Press

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