Variable area plug nozzle

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

Patent

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Details

F02K 1/00 (2006.01) F02K 1/06 (2006.01) F02K 1/42 (2006.01) F02K 1/46 (2006.01) F02K 1/78 (2006.01)

Patent

CA 2472604

A center plug (36) is configured for variable use in an exhaust nozzle (34). A forward portion of the plug (36) includes an inlet (56) having a closing flap (58) therein, and an aft portion of the plug includes an outlet (60). The flap (58) is selectively open during aircraft takeoff operation and up to a present climb altitude for bypassing a portion of core exhaust flow through the plug, with the flap being closed from preset altitude and cruise operation. Opening the flap (58) correspondingly increases the available flow area for discharging the exhaust flow for reducing velocity thereof, and attenuating noise.

L'invention concerne un noyau central (36) polyvalent dans une tuyère d'éjection (34). La partie avant du noyau (36) comprend une admission (56) dotée d'un volet de fermeture (58), et la partie arrière comprend une sortie (60). Le volet (58) s'ouvre sélectivement pendant les opérations de décollage de l'aéronef jusqu'à une altitude de montée déterminée et détourne une partie du flux d'échappement principal par le noyau central, le volet se fermant à partir d'une altitude déterminée et pendant les opérations de croisière. L'ouverture du volet (58) revient à augmenter la zone d'écoulement disponible pour l'évacuation du flux d'échappement et le ralentissement de l'écoulement, ce qui entraîne la réduction du niveau sonore.

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