Bluff-body drag reduction using a deflector |
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Authors: | Grégoire Fourrié Laurent Keirsbulck Larbi Labraga Patrick Gilliéron |
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Institution: | (1) Univ Lille Nord de France, 59000 Lille, France;(2) UVHC, TEMPO, 59313 Valenciennes, France;(3) Renault Group, Research Division, Fluid Mechanics & Aerodynamics, 78288 Guyancourt, France |
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Abstract: | 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 × 105 and 7.7 × 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 flow control on such
geometries should consider all the flow structures that contribute to the model wake flow. |
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