EXPERIMENTAL STUDY OF THE WAKE OF A SIMPLIFIED TRUCK MODEL IN GROUND PROXIMITY IN VIEW OF DEFINING A CONTROL STRATEGY FOR DRAG REDUCTION - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2017

EXPERIMENTAL STUDY OF THE WAKE OF A SIMPLIFIED TRUCK MODEL IN GROUND PROXIMITY IN VIEW OF DEFINING A CONTROL STRATEGY FOR DRAG REDUCTION

Résumé

Near wake study of a simplified truck model is presented for various underbody velocity. The mean base pressure evolution and the near wake structure evolution for a change of the underbody velocity lead to the identification of four classes of flow. The wake of class (I), for un-derbody velocities below 15% of the free stream velocity U ∞ looks like a 3D backward facing step. Then for higher underbody velocities, until typically 0.4U ∞ , the wakes of classes (II) and (III) are associated to a back-flow impag-ing the rear base. This back-flow is responsible for a low pressure area on the bottom of the rear base. It would then be interesting to limit the curvature of the back-flow in order to limit the low pressure. The last class is identified for an underbody velocity above 0.6U ∞ and the wake looks like an Ahmed body wake. For all classes, turbulence is mainly localized in the upper and lateral shear layers. Flow control on these sides would be useful to attenuate these velocity fluctuations for stabilizing the near wake.
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Dates et versions

hal-02405681 , version 1 (11-12-2019)

Identifiants

  • HAL Id : hal-02405681 , version 1

Citer

M. Szmigiel, M. Michard, T. Castelain, D. Juvé, D. Chacaton. EXPERIMENTAL STUDY OF THE WAKE OF A SIMPLIFIED TRUCK MODEL IN GROUND PROXIMITY IN VIEW OF DEFINING A CONTROL STRATEGY FOR DRAG REDUCTION. 52nd 3AF International Conference on Applied Aerodynamics, Mar 2017, Ecully, France. ⟨hal-02405681⟩
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