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Article Dans Une Revue Experiments in Fluids Année : 2011

Bluff-body drag reduction using a deflector

Résumé

A passive flow control on a generic car model was experimentally studied. This control consists of a deflector placed on the upper edge of the model rear window. The study was carried out in a wind tunnel at Reynolds numbers based on the model height of 3.1 x 105 and 7.7 x 105. The flow was investigated via standard and stereoscopic particle image velocimetry, Kiel pressure probes and surface flow visualization. The aerodynamic drag was measured using an external balance and calculated using a wake survey method. Drag reductions up to 9% were obtained depending on the deflector angle. The deflector increases the separated region on the rear window. The results show that when this separated region is wide enough,it disrupts the development of the counter-rotating longitudinal vortices appearing on the lateral edges of the rear window. The current study suggests that flowcontrol on such geometries should consider all the flow structures that contribute to the model wake flow.

Dates et versions

hal-00907982 , version 1 (22-11-2013)

Identifiants

Citer

Patrick Gilliéron, Grégoire Fourrié, Larbi Labraga, Laurent Keirsbulck. Bluff-body drag reduction using a deflector. Experiments in Fluids, 2011, 50, p. 385-395. ⟨10.1007/s00348-010-0937-6⟩. ⟨hal-00907982⟩

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