초록 ▼

A multiple bypass turbofan engine includes a core Brayton Cycle gas generator with a fuel rich burning combustor and is provided with a variable supercharged bypass duct around the gas generator with a supercharging means in the supercharged bypass duct powered by a turbine not mechanically connecte

A multiple bypass turbofan engine includes a core Brayton Cycle gas generator with a fuel rich burning combustor and is provided with a variable supercharged bypass duct around the gas generator with a supercharging means in the supercharged bypass duct powered by a turbine not mechanically connected to the gas generator. The engine further includes a low pressure turbine driven forward fan upstream and forward of an aft fan and drivingly connected to a low pressure turbine by a low pressure shaft, the low pressure turbine being aft of and in serial flow communication with the core gas generator. A fan bypass duct is disposed radially outward of the core engine assembly and has first and second inlets disposed between the forward and aft fans. An inlet duct having an annular duct wall is disposed radially inward of the bypass duct and connects the second inlet to the bypass duct. A supercharger means for compressing air is drivingly connected to the low pressure turbine and is disposed in the inlet duct. A secondary combustor or augmentor is disposed in an exhaust duct downstream of and in fluid flow communication with the bypass duct and the gas generator.

대표청구항 ▼

[ What is claimed is:] [1.] A multiple bypass turbofan engine comprising:a Brayton Cycle gas generator having a fuel rich burning combustor;a fan section comprising in downstream serial flow relationship a forward fan and an aft fan;said fan section upstream and forward of said gas generator and dri

[ What is claimed is:] [1.] A multiple bypass turbofan engine comprising:a Brayton Cycle gas generator having a fuel rich burning combustor;a fan section comprising in downstream serial flow relationship a forward fan and an aft fan;said fan section upstream and forward of said gas generator and drivingly connected to a low pressure turbine by a low pressure shaft that is aft of and in serial flow communication with said gas generator;a fan bypass duct disposed radially outward of said gas generator and having first and second annular inlets disposed between said forward and aft fans;an annular inlet duct having an annular duct wall, disposed radially inward of said bypass duct, said annular duct wall and said annular inlet duct connecting said second inlet to said bypass duct;an exhaust duct downstream of and in fluid communication with said fan bypass duct and said low pressure turbine at an upstream end of said exhaust duct;said exhaust duct comprising in downstream serial flow relationship a mixing section, a combustion section, and an exhaust nozzle; anda supercharger means for compressing air, said supercharger disposed in said inlet duct and drivingly connected to said low pressure turbine;said aft fan having a row of aft fan rotor blades disposed adjacent to and longitudinally aft of a row of aft fan stator vanes;said aft fan rotor blades having airfoils that generally extends radially outward from blade airfoil bases to airfoil tips;said supercharger means comprising:at least one of said aft fan stator vanes having an independently variable radially outer vane tip portion and an independently variable radially inner van hub portion separated by a non-rotatable portion of said annular duct wall, andsaid aft fan blades having radially outer airfoil tip sections and radially inner hub sections of airfoils separated by a rotatable portion of said annular duct wall, such that said tip sections are disposed in said inlet duct.