Recesses on a surface

B - Operations – Transporting – 63 – B

Patent

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Details

B63B 1/34 (2006.01) B64C 21/10 (2006.01)

Patent

CA 2434541

Formations on the surface of bodies for reducing the drag relative to a medium which the body is located in or close to. The formations comprise a plurality of cavities (1,20,40,60). The surface in which the cavities are formed is closed. The cavity has a disruption edge (5,25,44,66) adjacent to the cavity, with the disruption edge located upstream of the cavity, so as to set the flowing medium most proximal to the surface into turbulence upon passing the disruption edge. The cavity has a maximum depth from the surface of at least approximately 2mm.

Selon l'invention, des formations sont pratiquées à la surface de corps afin d'en réduire la traînée par rapport à un milieu dans lequel ou proche duquel se trouve le corps. Les formations comprennent une pluralité de cavités (1, 20, 40, 60). La surface dans laquelle sont formées les cavités est fermée. La cavité présente une arête marquée (5, 25, 44, 66) adjacente à la cavité, l'arête marquée étant disposée en aval de la cavité de sorte que le milieu en circulation à l'emplacement le plus proximal par rapport à la surface, est mis en turbulence au moment où il passe près de l'arête marquée. La cavité a une profondeur maximale par rapport à la surface d'au moins environ 2 mm.

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