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Experiments in Fluids

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01-02-2011 | Research Article

Bluff-body drag reduction using a deflector

Authors: Grégoire Fourrié, Laurent Keirsbulck, Larbi Labraga, Patrick Gilliéron

Published in: Experiments in Fluids | Issue 2/2011

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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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Ahmed SR (1981) An experimental study of the wake structures of typical automobile shapes. J Wind Eng Ind Aerodyn 9(1–2):49–62CrossRef

Ahmed SR, Ramm G, Faltin G (1984) Some salient features of the time-averaged ground vehicle wake. SAE technical paper 840300

Aider JL, Beaudoin JF, Wesfreid JE (2009) Drag and lift reduction of a 3d bluff-body using active vortex generators. Experiments in Fluids. doi:10.1007/s00348-009-0770-y

Beaudoin JF, Aider JL (2008) Drag and lift reduction of a 3d bluff-body using flaps. Exp Fluids 44(4):491–501CrossRef

Beaudoin JF, Cadot O, Aider JL, Gosse K, Paranthoën P, Hamelin B, Tissier M, Allano D, Mutazabi I, Gonzales M, Wesfreid JE (2004) Cavitation as a complementary tool for automotive aerodynamics. Exp Fluids 37(5):763–768CrossRef

Beaudoin JF, Cadot O, Aider JL, Wesfreid JE (2006) Drag reduction of a bluff-body using adaptive control methods. Phys Fluids 18(8):085107.1–085107.10

Ben-Hamou E, Arad E, Seifert A (2007) Generic transport aftbody drag reduction using active flow control. Flow Turbulence Combust 78(3–4):365–382CrossRef

Bruneau CH, Mortazavi I (2008) Numerical modelling and passive flow control using porous media. Comput Fluids 37(5):488–498

Brunn A, Nitsche W (2006) Active control of turbulent separated flows over slanted surfaces. Int J Heat Fluid Flow 27(5):748–755CrossRef

Brunn A, Wassen E, Sperber D, Nitsche W, Thiele F (2007) Active drag control for a generic car model. Notes Numer Fluid Mech Multidiscip Design 95:247–259CrossRef

Chue SH (1975) Pressure probes for fluid measurement. Prog Aerosp Sci 16(2):147–233CrossRef

Fares E (2005) Unsteady flow simulation of the ahmed reference body using a lattice boltzmann approach. Comput Fluids 35(8–9):940–950CrossRef

Fukuda H, Yanagimoto K, China H, Nakagawa K (1995) Improvement of vehicle aerodynamics by wake control. JSAE Rev 16(2):151–155CrossRef

Gad-El-Hak M (2000) Flow control: passive, active,and reactive flow management. Cambridge University Press, CambridgeMATHCrossRef

Geropp D, Odenthal HJ (2000) Drag reduction of motor vehicles by active flow control using the coanda effect. Exp Fluids 28(1):74–85CrossRef

Gilliéron P, Chometon F (1999) Modelling of stationary three-dimensional separated air flows around an ahmed reference model. In: 3rd International Workshop on Vortex, ESAIM Proceedings, vol 7, pp 173–182

Gilliéron P, Kourta A (2010) Aerodynamic drag reduction by vertical splitter plates. Exp Fluids 48(1):1–16 doi:10.1007/s00348-009-0705-7 CrossRef

Guilmineau E (2008) Computational study of flow around a simplified car body. J Wind Eng Ind Aerodyn 96(6–7):1207–1217CrossRef

Hucho WH (1998) Aerodynamics of road vehicles, Cambridge University Press, Cambridge, pp 133–142 (Chap. Aerodynamic drag of passenger cars, flow field around a car)

Krajnović S, Davidson L (2004) Large-eddy simulation of the flow around simplified car model. In: 2004 SAE World Congress : 2004-01-0227, Detroit, USA

Lehugeur B, Gilliéron P, Ivanić T (2006) Contribution de l’éclatement tourbillonnaire à la réduction de la traînée des véhicules automobiles: approche numérique. Comptes Rendus Mécanique 334(6):368–372MATHCrossRef

Lienhart H, Stoots C, Becker S (2000) Flow and turbulence structures in the wake of a simplified car model (ahmed model). In: DGLR Fach Symposium der AG STAB, Stuttgart, Germany

Minguez M, Pasquetti R, Serre E (2008) High-order large-eddy simulation of flow over the “ahmed body” car model. Phys Fluids 20(9): 095101.1–095101.17

Onorato M, Costelli AF, Garrone A (1984) Drag measurement through wake analysis. SAE technical paper 840302

Pastoor M, Henning L, Noack BR, King R, Tadmor G (2008) Feedback shear layer control for bluff body drag reduction. J Fluid Mech 608:161–196MATHCrossRef

Prasad AK, Adrian RJ, Landreth CC, Offutt PW (1992) Effect of resolution on the speed and accuracy of particle image velocimetry interrogation. Exp Fluids 13(2):105–116CrossRef

Rouméas M, Gilliéron P, Kourta A (2008) Drag reduction by flow separation control on a car after body. Int J Numer Methods Fluids 60(11):1222–1240CrossRef

Rouméas M, Gilliéron P, Kourta A (2009) Analysis and control of the near-wake flow over a square-back geometry. Comput Fluids 38(1):60–70CrossRef

Spohn A, Gilliéron P (2002) Flow separations generated by a simplified geometry of an automotive vehicle. In: UTAM Symposium on unsteady separated flows, Toulouse, France

Stapleford WR (1981) Aerodynamic improvements to the body and cooling system of a typical small saloon car. J Wind Eng Ind Aerodyn 9(1–2):63–75CrossRef

Strachan RK, Knowles K, Lawson NJ (2007) The vortex structure behind an ahmed reference model in the presence of a moving ground plane. Exp Fluids 42(5):659–669CrossRef

van Dam CP (1999) Recent experience with different methods of drag prediction. Prog Aerosp Sci 35(8):751–798CrossRef

Vino G, Watkins S, Mousley P, Watmuff J, Prasad S (2005) Flow structures in the near-wake of the ahmed model. J Fluids Struct 20(5):673–695CrossRef

Watkins S, Vino G (2008) The effect of vehicle spacing on the aerodynamics of a representative car shape. J Wind Eng Ind Aerodyn 96(6–7):1232–1239CrossRef

Title: Bluff-body drag reduction using a deflector
Authors: Grégoire Fourrié
Laurent Keirsbulck
Larbi Labraga
Patrick Gilliéron
Publication date: 01-02-2011
Publisher: Springer-Verlag
Published in: Experiments in Fluids / Issue 2/2011
Print ISSN: 0723-4864
Electronic ISSN: 1432-1114
DOI: https://doi.org/10.1007/s00348-010-0937-6

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