Airfoil with flow deflector

B - Operations – Transporting – 64 – C

Patent

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Details

B64C 3/28 (2006.01) B64C 3/58 (2006.01) B64C 21/02 (2006.01) F15D 1/00 (2006.01)

Patent

CA 2721276

An airfoil (3) comprising a high pressure surface (4); a low pressure surface (5); a leading edge (6) where the high and low pressure surfaces meet at the front of the airfoil; and a trailing edge (7) where the high and low pressure surfaces meet at the back of the airfoil. A porous flow deflector (8) extends from the low pressure surface. The porous flow deflector is attached to the low pressure surface at a position which is closer in a chord-wise sense to the leading edge than to the trailing edge. That is, the percentage chord distance between the leading edge and the position where the flow deflector is attached is less than 50%. The porous flow deflector comprises a plurality of flow deflection members (8) each spaced progressively further from the low pres-sure surface in a direction away from the low pressure surface, and each flow deflection member is angled down to the rear rela-tive to a local tangent of the low pressure surface. The porous flow deflector deflects air towards the low pressure surface as it passes through the porous flow deflector.

La présente invention se rapporte à un profil aérodynamique (3) comprenant une surface haute pression (4), une surface basse pression (5), un bord dattaque (6) où se rejoignent la surface haute pression et la surface basse pression à lavant du profil aérodynamique et un bord de fuite où la surface haute pression et la surface basse pression se rejoignent à larrière du profil aérodynamique. Un déflecteur (8) poreux sétend depuis la surface basse pression. Le déflecteur poreux est fixé à la surface basse pression dans une position qui est plus proche, dans le sens de la corde, du bord dattaque que du bord de fuite. En d'autres termes, la distance de corde entre le bord dattaque et la position dans laquelle est fixé le déflecteur est inférieure à 50 %. Le déflecteur poreux comprend une pluralité déléments de déflexion (8) espacés chacun progressivement davantage de la surface basse pression en séloignant de la surface basse pression, et chaque élément de déflexion sinclinant vers le bas et larrière par rapport à une tangente locale de la surface basse pression. Le déflecteur poreux détourne lair vers la surface basse pression lorsquil le traverse.

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