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Bluff-body drag reduction using a deflector

Bluff-body drag reduction using a deflector
Bluff-body drag reduction using a deflector
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.
0723-4864
385-395
Fourrié, Grégoire
b79ce500-fc9f-4f8f-91ee-5cdeeb0f1907
Keirsbulck, Laurent
23ffecba-c4da-4741-9b51-4bcc6098e637
Labraga, Larbi
4f523e9d-1045-432f-a971-769dea06b3bd
Gilliéron, Patrick
e349a9d7-15f6-434f-810e-47f532a00591
Fourrié, Grégoire
b79ce500-fc9f-4f8f-91ee-5cdeeb0f1907
Keirsbulck, Laurent
23ffecba-c4da-4741-9b51-4bcc6098e637
Labraga, Larbi
4f523e9d-1045-432f-a971-769dea06b3bd
Gilliéron, Patrick
e349a9d7-15f6-434f-810e-47f532a00591

Fourrié, Grégoire, Keirsbulck, Laurent, Labraga, Larbi and Gilliéron, Patrick (2011) Bluff-body drag reduction using a deflector. Experiments in Fluids, 50 (2), 385-395. (doi:10.1007/s00348-010-0937-6).

Record type: Article

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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More information

e-pub ahead of print date: July 2010
Published date: February 2011
Organisations: Aerodynamics & Flight Mechanics Group

Identifiers

Local EPrints ID: 355049
URI: http://eprints.soton.ac.uk/id/eprint/355049
ISSN: 0723-4864
PURE UUID: 7d274147-ae5a-4de1-8514-039151790aa3

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Date deposited: 12 Aug 2013 12:00
Last modified: 14 Mar 2024 14:28

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Contributors

Author: Grégoire Fourrié
Author: Laurent Keirsbulck
Author: Larbi Labraga
Author: Patrick Gilliéron

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