Hybrid exhaust nozzle

An exhaust system for a gas turbine engine, the exhaust system comprising

• a inner duct arranged around a central axis of the gas turbine engine, the inner duct defining an inner passageway arranged to receive a first stream of pressurized air discharged from an engine core of the gas turbine engine and a second stream of pressurized air discharged from a fan of the gas turbine engine and passed around the engine core,
• an outer duct arranged radially outward of the inner duct around the central axis of the gas turbine engine, the outer duct cooperating with the inner duct to define an outer passageway arranged to receive a third stream of pressurized air discharged from the fan of the gas turbine engine and passed around the engine core,
• a plurality of aft adjustment flaps mounted to pivot relative to the inner duct, each of the aft adjustment flaps having an inner portion extending radially inward from the inner duct toward the central axis and an outer portion extending radially outward from the inner duct away from the central axis, and
• a plurality of forward adjustment flaps positioned forward of the aft adjustment flaps along the central axis, each of the forward adjustment flaps having an aft end pivotally coupled to the outer portion of a corresponding aft adjustment flap and a forward end mounted to the inner duct to slide relative to the inner duct.

An aircraft comprising

• an airframe,
• a nacelle supported by the airframe, and
• a gas turbine engine supported by the airframe and surrounded at least partially by the nacelle, the gas turbine engine including an engine core configured to discharge a first stream of pressurized air that is passed through the engine core along a central axis, a fan coupled to the engine core to be driven by the engine core and configured to discharge a second stream of pressurized air and a third stream of pressurized air that are passed around the engine core, and an exhaust system coupled to the engine core, the exhaust system including (i) an inner duct arranged around the central axis to define an inner passageway arranged to receive the first stream and the second stream of pressurized air, (ii) an outer duct arranged radially outward of the inner duct around the central axis so that the inner duct and the outer duct cooperate to define an outer passageway arranged to receive the third stream of pressurized air, (iii) a plurality of aft adjustment flaps mounted to pivot relative to the inner duct, each of the aft adjustment flaps having an inner portion extending radially inward from the inner duct toward the central axis and an outer portion extending radially outward from the inner duct away from the central axis, and (iv) a plurality of forward adjustment flaps, each of the forward adjustment flaps having an aft end pivotally coupled to the outer portion of a corresponding aft adjustment flap and a forward end mounted to the inner duct to slide relative to the inner duct.