Turbofan variable fan nozzle

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

Patent

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Details

F02K 1/12 (2006.01) F01D 17/16 (2006.01) F02C 7/045 (2006.01) F02K 1/82 (2006.01) F02K 3/04 (2006.01) F02K 3/075 (2006.01)

Patent

CA 2472605

A turbofan exhaust nozzle (28) includes a fan duct (40) defined between a fan nacelle (32) and core engine cowling (30). The duct (40) includes an arcuate outlet (42) at the trailing edge (44) of the nacelle (32). A movable flap (46) is disposed in a minor portion of the fan duct (40), with a remaining major portion of the fan duct having a constant flow area. The flap (46) may be moved between stowed and deployed positions to locally decrease flow area inside the duct (40) for noise attenuation.

L'invention concerne une tuyère d'échappement (28) de turboréacteur double flux comprenant un conduit de soufflante (40) défini entre une nacelle (32) et un capot central (30). Le conduit (40) comprend une sortie courbée (42) au niveau du bord arrière (44) de la nacelle (32). Un volet mobile (46) est disposé dans une partie secondaire du conduit de soufflante (40), la partie principale restante dudit conduit comprenant une zone d'écoulement constant. Le volet (46) peut passer d'une position rangée à une position déployée afin de réduire localement la zone d'écoulement à l'intérieur du conduit (40), ce qui atténue le bruit.

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