Reduction of frictional losses in the region of boundary...

B - Operations – Transporting – 64 – C

Patent

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B64C 21/06 (2006.01) F15D 1/12 (2006.01)

Patent

CA 2597642

The invention relates to an aerodynamic body with a plurality of nozzles for throttling a fluid flow to be removed by suction through the nozzles (1) in a self- regulated fashion. The invention also pertains to an aircraft that is equipped with a suction system of this type. Lastly, the invention pertains to the utilization of a plurality of the aforementioned throttling nozzles (1) in order to reduce the frictional losses on a surface (8), around which a fluid flows. The aerodynamic body according to the invention comprises a plurality of throttling nozzles (1) with a throttle section (5) that is defined by an inlet (2) and an outlet (3), wherein the interior wall of this throttle section is realized in such a way that the effective flow cross section Aw is reduced in a self-regulated fashion due to the creation of turbulences on the interior wall of the throttle section (5) as the pressure differential between the inlet (2) and the outlet (3) of the throttle section (5) increases.

L'invention concerne un corps aérodynamique comprenant une pluralité de buses permettant d'étrangler un écoulement de fluide à retirer par aspiration par le biais de buses (1) d'une manière auto-régulée. L'invention concerne également un aéronef équipé d'un système d'aspiration de ce type. Enfin, l'invention concerne l'utilisation d'une pluralité de buses d'étranglement susmentionnées (1) afin de réduire les pertes par frottement sur une surface (8) autour de laquelle un fluide s'écoule. Le corps aérodynamique selon l'invention comprend une pluralité de buses d'étranglement (1) dotées d'une section d'étranglement (5) définie par une admission (2) et une évacuation (3), la paroi intérieure de cette section d'étranglement étant fabriquée de manière que la section transversale d'écoulement effective Aw soit réduite de manière auto-régulée, en raison de la création de turbulences sur la paroi intérieure de la section d'étranglement (5) au moment où la différence de pression entre l'admission (2) et l'évacuation (3) de la section d'étranglement (5) augmente.

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