Aerodynamic mirror exterior shell

B - Operations – Transporting – 60 – R

Patent

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Details

B60R 1/06 (2006.01)

Patent

CA 2245308

An aerodynamic exterior rear view mirror for motor vehicles that has low drag as a result of prevention of laminar boundary layer separation on the mirror head and subsequent turbulent wake size reduction. The vehicle mirror comprises an aerodynamic exterior shell having a continuously smooth surface with inboard and outboard trailing edges. The surfaces of the shell preceding the trailing edges can be either parallel or closing relative to the free stream airflow. A boundary layer control device that consists of a trip strip isformed on the exterior surface of the mirror head just upstream of the transition or separation point where the laminar boundary layer flow would transition to turbulent boundary layer flow with delayed separation or to complete separation absent the boundary layer trip strip. The trip strip, when correctly sized and utilized, will assist the laminar boundary layer to transition to turbulent boundary layer flow which reenergizes the boundary layer. The turbulent boundary layer is more stable and has more energy which will enable it to adhere to the surface and allow the airflow to continue to and separate atthe mirror head trailing edges. As a result separation is greatly reduced or eliminated which reduces the drag that would have been present, absent the boundary layer control device.

Rétroviseur extérieur à profil aérodynamique pour véhicules automobiles, dont la traînée a été réduite par empêchement du décollement de la couche limite laminaire, ce qui réduit le sillage. Le rétroviseur de cette invention présente une surface régulière et entièrement lisse et des bords de fuite intérieur et extérieur. Les zones de la surface adjacentes aux bords de fuite peuvent être parallèles où convergentes par rapport à l'écoulement libre. Un dispositif agissant pour recoller la couche limite est placé sur le miroir, juste en amont du point de transition où l'écoulement laminaire deviendrait turbulent avec décollement. S'il est correctement dimensionné et judicieusement placé, ce dispositif facilite la transition de l'écoulement laminaire à l'écoulement turbulent, en communiquant à la couche limite une énergie supplémentaire. La couche limite turbulente est plus stable et adhère plus fortement à la surface, ce qui facilite l'écoulement des filets d'air jusqu'aux bords de fuite sans décollement. Le décollement de la couche limite est ainsi grandement réduit, voire complètement éliminé, ce qui réduit l'effet de traînée qui se produirait sans le dispositif de cette invention.

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