An exhaust nozzle for a gas turbine engine, the exhaust nozzle comprising:
- an exhaust duct configured to receive an exhaust flow of gas from a combustor of the gas turbine engine;
- a first flap rotatably coupled to the exhaust duct for rotation about a first axis of rotation;
- a first actuator configured to actuate the first flap about the first axis of rotation between a first inner position and a first outer position;
- a second flap rotatably coupled to the exhaust duct for rotation about a second axis of rotation;
- and
- a second actuator configured to actuate the second flap about the second axis of rotation between a second inner position and a second outer position,
- wherein the first and second flaps at least in part define a passageway configured to convey the exhaust flow of gas to an exterior of the gas turbine engine,
- wherein the first and second axes of rotation are coaxial,
- wherein the first flap and the second flap are convergent-divergent flaps,
- wherein the first flap and the second flap define a rectangular nozzle,
- wherein the first flap is a single body with a convergent portion and a divergent portion,
- wherein the convergent portion of the first flap and the divergent portion of the first flap are fixed relative to each other,
- wherein the second flap is a single body with a convergent portion and a divergent portion,
- wherein the convergent portion of the second flap and the divergent portion of the second flap are fixed relative to each other, and
- wherein the exhaust nozzle further comprises a first roller rotatably coupled to the exhaust duct and the first flap comprises a first bearing surface that protrudes from an exterior surface of the convergent portion and is fixed with respect to the convergent portion in order to move together with the convergent portion and that is configured to bear against the first roller during rotational movement of the first flap about the first axis of rotation, wherein the first bearing surface forms part of a first cylindrical surface having a central axis that is coaxial with the first and second axes of rotation, and
- wherein the exhaust nozzle further comprises a second roller rotatably coupled to the exhaust duct and the second flap comprises a second bearing surface that protrudes from an exterior surface of the convergent portion and is fixed with respect to the convergent portion in order to move together with the convergent portion and that is configured to bear against the second roller during rotational movement of the second flap about the second axis of rotation, wherein the second bearing surface forms part of a second cylindrical surface having a central axis that is coaxial with the first and second axes of rotation.