초록 ▼

A two dimensional exhaust nozzle for a gas turbine engine having reverse thrust capability includes a pair of spaced apart converging flaps which are able to rotate about their respective axes until their downstream edges meet along the engine centerline to block the flow of gases through the engine

A two dimensional exhaust nozzle for a gas turbine engine having reverse thrust capability includes a pair of spaced apart converging flaps which are able to rotate about their respective axes until their downstream edges meet along the engine centerline to block the flow of gases through the engine and to redirect the flow through fixed area reverser outlet ports. The axes about which each convergent flap rotates are spaced inwardly from their respective convergent flap surfaces. The flaps themselves cover the outlet ports when the flaps are in forward thrust operating positions. The flaps move away from and unblock the outlets as they rotate to their reverse thrust position. The distance between the flap axis and its convergent surface is critical to being able to use short flaps while obtaining large reverser outlet areas.

대표청구항 ▼

A two-dimensional variable area gas turbine engine exhaust nozzle having thrust reversing capability, said nozzle including spaced apart side wall means and upper and lower flap assemblies connected to said side wall means defining an exhaut gas flow path within said nozzle, said nozzle having a cen

A two-dimensional variable area gas turbine engine exhaust nozzle having thrust reversing capability, said nozzle including spaced apart side wall means and upper and lower flap assemblies connected to said side wall means defining an exhaut gas flow path within said nozzle, said nozzle having a centerline, each of said upper and lower flap assemblies comprising: (a) stationary duct means extending between said side wall means, said duct means defining a forward sealing surface, said forward sealing surface having a front edge and a back edge, both extending between said side wall means; (b) a nozzle flap extending between said side wall means and secured thereto for rotation about a stationary axis perpendicular to said side wall means through a range of full forward thrust positions and to a full reverse thrust position, said flap having an outer sealing surface and a flat inner surface for directing the flow of gas, said inner surface also facing and spaced from said flap axis of rotation by a perpendicular, distance c, said flap having a front edge and a rear edge, said front edge being a distance h from the nozzle centerline when the flap is in its maximum gas exit area full forward thrust position, and wherein the ratio c/h is between 0.2 and 0.4; wherein said flap rear edges of said upper and lower flap assemblies and said side wall means together define a gas exit area Ae, said nozzle flap rear edges adapted to contact each other at the nozzle centerline in the full reverse thrust position such that Ae=0, said flap front edge being in sealing relation with said forward sealing surface in all full forward thrust positions, and when said area Ae is the minimum area for full forward thrust said flap front edge is adjacent said rear edge of said forward sealing surface, and when said area Ae=0 said flap and said rear edge of said front sealing surface defines a reverser outlet having an area AR at least 1.15 times the minimum area Ae for full forward thrust nozzle positions.