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Experimental investigation on longitudinal vortex control over a dihedral bluff body

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Abstract

The present paper addresses an experimental investigation of the dynamic and the control of a longitudinal vortex emanating from the front pillar of a dihedral bluff body corresponding to a simplified geometry of an automotive vehicle. The control system is based on a thin rectangular slot located along the lateral edge of the windscreen and provides steady suction or blowing normal to the lateral face of the geometry. Qualitative results obtained with dye visualizations and Schlieren photos provide an overview of the impact of the control on the topology of the vortex flow. Quantitative Stereo-PIV measurements and unsteady forces measurements are used to characterize the interaction between the control and the longitudinal vortex. Controls that change significantly the topology of the vortex core and reduce aerodynamic drag are identified.

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Abbreviations

A :

Near transversal wake section

C X :

Aerodynamic drag coefficient

d :

Length of the windshield of the simplified car geometry

e :

Width of the blowing/suction slot

F X :

X component of the resultant pressure force acting on the vehicle

h :

Height of the simplified car geometry

l :

Width of the simplified car geometry

L :

Length of the simplified car geometry

P i :

Total pressure

P io :

Far field incoming total pressure

Re :

Reynolds number

S :

Projected surface of the model along the X-direction (h × l)

St :

Strouhal number

U X :

X component of the local velocity of the flow field

U Y :

Y component of the local velocity of the flow field

U Z :

Z component of the local velocity of the flow field

V 0 :

Far field incoming fluid velocity

V S :

Suction velocity

V B :

Blowing velocity

(X, Y, Z):

Coordinate system related to the simplified car geometry

ρ :

Density of water

λ :

Length of the blowing/suction slot

References

  • Desse JM (2002) Visualisations par techniques optiques–Ombroscopie, strioscopie, interférométrie différentielle et absolue. Rev Sci Tech Déf 56:97–110

    Google Scholar 

  • Dong S, Kariniadakis GE (2005) A DNS study of cylinder shear layer instability. In: Fourth symposium on Bluff body wakes and vortex induced vibrations, Santorin

  • Gilliéron P, Levallois E (2005) Contribution de l’aérodynamique au développement durable et sécuritaire. Mécanique Ind 6:567–574

    Article  Google Scholar 

  • Hucho WH (1998) Aerodynamics of road vehicles, 4th edn. In: SAE edition. ISBN 0-7680-0029-7

  • Krajnovic S, Davidson L (2004) Contribution large-eddy simulation of the flow around a simplified car model. In: SAE international congress & exposition, Detroit, MI, USA

  • Leclerc C, Levallois E, Gilliéron P, Kourta A (2006) Aerodynamic drag reduction by synthetic jet: a 2D numerical study around a simplified car. In: Third AIAA flow control conference, San Francisco, CA, USA

  • Lehugeur B, Gilliéron P (2006) Active control of vortex breakdown phenomenon in the wake of a simplified car geometry. In: ASME Joint US-European Fluids Engineering Summer Meetings, Miami, FL, USA

  • Lehugeur B, Gilliéron P, Ta-Phuoc L (2005) Characterization of longitudinal vortices in the wake of a simplified car model. In: 23rd AIAA applied aerodynamics conference, Toronto, Canada

  • Lehugeur B, Gilliéron P, Ta-Phuoc L (2007) Characterization and control of longitudinal vortices over a dihedral bluff body: numerical approach. J Mech Eng 58(5):249–272

    Google Scholar 

  • Levallois E, Gilliéron P (2005) Contrôle des écoulements en aérodynamique automobile et réduction de traînée par éléments séparateurs—Analyse par PIV. In: Colloque National de Visualisation et de Traitement d’Images en Mécanique des Fluides, Fluvisu11, Lyon

  • Monnier JC, Croisier G, Noger C (2001) Développement et validation d’une technique de vélocimétrie par images de particules. Rapport technique ONERA no RT 1/01062DAAP

  • Onorato M, Costelli A, Garonne A. (1984) Measurement through wake analysis, SAE international congress & exposition, Detroit, Michigan, SAE SP-569:85–93

  • Renac F, Barberis D, Molton P (2005) Control of vortical flow over rounded leading-edge delta wing. AIAA J 43(7):1409

    Google Scholar 

  • Rouméas M, Gilliéron P, Kourta A (2005) Analyse and control of the near wake flow over a simplified car geometry. In: Fourth symposium on bluff body wakes and vortex induced vibrations, Santorin

  • Watanabe M, Harita M, Hayashi E (1978) The effect of body shapes on wind noise. In: SAE Paper No 780266, Society of automotive Engineers, Warrendale, PA, USA

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Acknowledgments

The authors would like to thank Ovide Rodriguez, Jacques Pruvost and Cécile Fatien from ONERA Lille for their help in these tests. Considerable efforts were also put into the building of the model and the suction/blowing system by the technical teams of ONERA.

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Authors and Affiliations

  1. Renault, Groupe Aérodynamique et Mécanique des Fluides, Technocentre, 1av. du Golf, 78288, Guyancourt Cedex, France

    Benjamin Lehugeur & Patrick Gilliéron

  2. Institut PRISME, Polytech’Orléans-Site Vinci, 8, rue Léonard de Vinci, 45072, Orléans Cedex 2, France

    Azeddine Kourta

Authors
  1. Benjamin Lehugeur
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  2. Patrick Gilliéron
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  3. Azeddine Kourta
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Corresponding author

Correspondence to Azeddine Kourta.

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Lehugeur, B., Gilliéron, P. & Kourta, A. Experimental investigation on longitudinal vortex control over a dihedral bluff body. Exp Fluids 48, 33–48 (2010). https://doi.org/10.1007/s00348-009-0707-5

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  • DOI: https://doi.org/10.1007/s00348-009-0707-5

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