초록 ▼

An exhaust assembly is provided for a gas turbine engine effective for propelling an aircraft from takeoff through subsonic and supersonic velocity. The exhaust assembly is effective for receiving exhaust gases discharged from an outlet of a core engine of an aircraft gas turbine engine. The assembl

An exhaust assembly is provided for a gas turbine engine effective for propelling an aircraft from takeoff through subsonic and supersonic velocity. The exhaust assembly is effective for receiving exhaust gases discharged from an outlet of a core engine of an aircraft gas turbine engine. The assembly includes a casing, a variable area converging-diverging nozzle attached to the casing and including a first throat and an outlet for channeling exhaust gases received from the core engine. A plurality of retractable chutes are disposed upstream of the nozzle outlet and are positionable in a deployed position forming a converging nozzle having a second throat with a flow area less than that of the first throat. Means are provided for channeling air along aft facing surfaces of the chutes into the CD nozzle for mixing with the exhaust gases when the chutes are disposed in the deployed position for reducing noise from the exhaust gases.

대표청구항 ▼

An exhaust assembly for an aircraft gas turbine engine including a core engine having an outlet for discharging exhaust gases comprising: a casing having an inlet for receiving said exhaust gases from said core engine outlet; a variable area converging-diverging CD nozzle attached to said casing and

An exhaust assembly for an aircraft gas turbine engine including a core engine having an outlet for discharging exhaust gases comprising: a casing having an inlet for receiving said exhaust gases from said core engine outlet; a variable area converging-diverging CD nozzle attached to said casing and including a first throat having a flow area A8 and an outlet having a flow area A9 for channeling said exhaust gases said CD nozzle further including: a plurality of spaced apart primary flaps defining therebetween a converging channel, each of said primary flaps having a downstream end, and an upstream and pivotally connected to said casing; a plurality of spaced apart secondary flaps defining therebetween a diverging channel, each of said secondary flaps having an upstream end pivotally connected to a respective one of said primary flap donwstream ends to define said first throat, and a downstream end pivotally and slidably connected to said casing, said diverging channel extending downstream from said first throat to said nozzle outlet; a plurality of spaced apart retractable chutes disposed upstream of said nozzle outlet in a flowpath surface and positionable in a deployed position inclined in a downstream direction radially away from said flowpath surface for forming a converging nozzle in fluid communication with said casing inlet including a second throat having a flow area A8″less than said first throat area A8, and positionable in a retracted position generally coextensive with said flowpath surface; means for channeling air along aft facing surfaces of said chutes into said CD nozzle for mixing with said exhaust gases when said chutes are disposed in said deployed position; and wherein each of said chutes has a generally U-shaped trailing edge including first and second transversely spaced apart legs, a base extending between said legs at radially inner ends thereof, and a top opening extending between said legs at radially outer ends thereof, said trailing edge being positioned in said exhaust gases when said chute is in said deployed position to define a shear perimeter wherein air provided by said channeling means along said trailing edge contacts said exhaust gases for mixing therewith, and said trailing edge being removed from said exhaust gases when said chute is in said retracted position; and said primary and secondary flaps being positionable in: a first position wherein said first throat area A8 has a maximum value and said chutes are disposed in said deployed position; a second position wherein said chutes are disposed in said retracted position and said first throat area A8 has a value less than said maximum value of said first throat area A8; and a third position wherein said chutes are disposed in said retracted position, said first throat area A8 has a value less than said maximum value of said first throat area A8, and said nozzle outlet area A9 has a maximum value.