Establishment of laminar boundary layer flow on an aerofoil...

B - Operations – Transporting – 64 – C

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B64C 21/02 (2006.01)

Patent

CA 2673594

In order to establish laminar flow on the attachment line (18) of an aerofoil body, a duct entrance (27) is provided on the leading edge of the aerofoil body for receiving spanwise boundary layer flow BLt. The exit (23) of the duct is located spanwise downstream of the duct entrance (27). The boundary layer flow BLt enters the duct (23) and is discharged downstream. The height of the duct entrance (27) above the leading edge of the aerofoil body is greater than the depth of the boundary layer BLt and thus a fresh laminar boundary layer is established on the outer surface (20) of the duct which propagates spanwise along the surface to re¬ join the leading edge of the aerofoil body.

L'invention concerne l'établissement d'un écoulement de couche limite laminaire sur un corps à surface portante. Afin d'établir un écoulement laminaire sur la ligne d'attache (18) d'un corps à surface portante, une entrée de conduit (27) est prévue sur le bord d'attaque du corps à surface portante pour recevoir un écoulement BLt de couche limite dans le sens de l'envergure. La sortie (23) du conduit est située dans le sens de l'envergure en aval de l'entrée de conduit (27). L'écoulement BLt de couche limite entre dans le conduit (23) et est déchargé en aval. La hauteur de l'entrée de conduit (27) au-dessus du bord d'attaque du corps à surface portante est plus grande que l'épaisseur de la couche limite BLt, et ainsi, une couche limite laminaire fraîche est établie sur la surface externe (20) du conduit, laquelle se propage dans le sens de l'envergure le long de la surface pour rejoindre le bord d'attaque du corps à surface portante.

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