Patent ID: 9181899
Filing Date: 2015-11-10
Classification: B64D,F02K,F05D

Abstract:
1. A turbofan exhaust nozzle comprising: a conical inner shell disposed coaxially inside a surrounding outer shell to define an annular flow duct therebetween terminating in an outlet at a trailing edge of said outer shell, and said inner shell terminates in a trailing edge aft of said outlet; and said inner shell varies in axial cone angle circumferentially therearound both forward and aft of said outlet; and said inner shell diverges aft inside said duct to a hump and then converges aft to said trailing edge thereof; and said cone angle varies circumferentially over both said diverging and converging portions of said inner shell; a pylon and diametrically opposite beam interrupting circumferentially said duct, wherein said cone angle has locally minimum values disposed at said pylon and beam, and increases to locally maximum values disposed circumferentially therebetween; and wherein said outer shell increases in radius as said cone angle increases in value circumferentially around said duct; and said inner and outer shells commence at constant diameters at a forward end of said duct; said outer shell terminates in a circumferentially variable diameter at said trailing edge thereof; and said inner shell terminates in a circumferentially constant diameter at a trailing edge thereof.