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Experiments on an elliptic circulation control aerofoil

Published online by Cambridge University Press:  30 July 2013

Drew A. Wetzel ,
John Griffin  and
Louis N. Cattafesta III
Drew A. Wetzel
Affiliation:
Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, USA
John Griffin
Affiliation:
Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, USA
Louis N. Cattafesta III*
Affiliation:
Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, USA
*
†Present address: Department of Mechanical Engineering, FAMU-FSU College of Engineering, Tallahassee, FL 32310, USA. Email address for correspondence: cattafesta@eng.fsu.edu
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Abstract

Experiments are performed on an elliptic circulation control aerofoil in an open-jet wind tunnel facility. The influence of blowing from a single trailing-edge slot on the external flow is assessed using two-component particle image velocimetry (PIV) and steady surface pressure measurements. The test section configuration (open jet or closed wall) significantly affects the leading-edge region of the flow field. PIV is also used to measure the curved wall jet and its interaction with the external flow near the trailing edge. PIV measurements of the curved wall jet reveal mean tangential velocity similarity in the outer region of the flow above the location where the tangential velocity reaches a local maximum. The length and velocity parameters required for similarity scale with the product of the chord Reynolds number and the momentum coefficient in accordance with the recent publication by Stalnov, Kribus & Seifert (J. Renew. Sustain. Energy, vol. 2, 2010, p. 063101). The separation location is also a function of the product of these parameters. The dataset is used to assemble equations to predict the similarity length scales, velocity scales and separation location. These equations compare well with the present measurements.

JFM classification

Flow Control: Flow Control Wakes/Jets: Jets Wakes/Jets: Wakes/Jets
Type
Papers
Information
Journal of Fluid Mechanics , Volume 730 , 10 September 2013 , pp. 99 - 144
Copyright
©2013 Cambridge University Press 

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Footnotes

‡

Present address: The Boeing Company, P.O. Box 3707 MC 0R-JF, Seattle, WA 98124, USA.

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