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Erschienen in:
2006 | OriginalPaper | Buchkapitel
Drag Reduction of an Ahmed Car Model by Means of Active Separation Control at the Rear Vehicle Slant
verfasst von : A. Brunn, W. Nitsche
Erschienen in: New Results in Numerical and Experimental Fluid Mechanics V
Verlag: Springer Berlin Heidelberg
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The experimental investigations described in the present paper deal with the reduction of the total aerodynamic drag of a generic car model (Ahmed-Body) by means of periodic forcing. The experiments carried out in this study focus on a unique approach to separation control using fundamental frequencies for local forcing of the shear layer separated from the rear end of the car model. The excitation of large scale vortex structures by periodic forcing intensifies the primary momentum transfer between the separation region and the outer flow, resulting in a substantial reduction of the separation length. A total drag reduction of 27% was achieved using the flow control method described in this study.