Noise reduction device for turbojet nacelle with mobile...

F - Mech Eng,Light,Heat,Weapons – 02 – K

Patent

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F02K 1/38 (2006.01) F02K 1/48 (2006.01)

Patent

CA 2732127

The invention relates to a turbojet nacelle (1) and to an aeroacoustic noise reduction device for said nacelle, the nacelle comprising a nozzle (10) on the downstream end thereof, said nozzle (10) comprising an inner wall inside which a first flow from the turbojet circulates and an outer wall (102) outside which a second flow corresponding to the surrounding outside air circulates. The invention also relates to an aeroacoustic noise reduction device (20) of the turbojet, comprising a plurality of chevrons (201) arranged on the circumference of the nozzle (10). The invention is characterised in that the aeroacoustic noise reduction device also comprises a slide (202) arranged on the circumference of the nozzle in such a way that it can rotate about the axis of the nozzle, each chevron (201) being connected to the slide (202) by means of a guiding element (204) that can move along the slide (202) during the rotation thereof in order to ensure the displacement of the chevron (201).

. L'invention concerne une nacelle (1) de turboréacteur et un dispositif de réduction des bruits aéro-acoustiques pour cette nacelle, la nacelle comportant à son extrémité aval une tuyère (10), la tuyère (10) comprenant une paroi interne à l'intérieur de laquelle circule un premier flux provenant du turboréacteur et une paroi externe (102) à l'extérieur de laquelle circule un deuxième flux correspondant à l'air extérieur environnant, et un dispositif (20) de réduction des bruits aéro-acoustiques du turboréacteur comportant une pluralité de chevrons (201) disposés sur la circonférence de la tuyère (10), caractérisée en ce que le dispositif de réduction des bruits aéro-acoustiques comprend, en outre, une glissière (202) disposée sur la circonférence de la tuyère et susceptible de tourner autour de l'axe de ladite tuyère, chaque chevron (201) étant relié à la glissière (202) par l'intermédiaire d'un élément de guidage (204) susceptible de se déplacer le long de la glissière (202) lors de la rotation de celle-ci pour assurer le déplacement de ce chevron (201).

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