초록 ▼

A hot gas recirculation pocket is provided in a gas turbine engine to capture hot gas ingested from an annular hot gas flow path into an internal cooled engine cavity, and to recirculate the ingested hot gas to the hot gas flow path. The engine includes rows of stator vanes and rotor blades mounted

A hot gas recirculation pocket is provided in a gas turbine engine to capture hot gas ingested from an annular hot gas flow path into an internal cooled engine cavity, and to recirculate the ingested hot gas to the hot gas flow path. The engine includes rows of stator vanes and rotor blades mounted in an axially alternating sequence along the hot gas flow path, wherein the rotor blades are peripherally supported by rotor disks disposed within the cooled engine cavity and coupled to a main engine shaft. The recirculation pocket is defined by a contoured shroud mounted within the cooled engine cavity to form a radially outwardly open toroidal-shaped pocket for capturing and recirculating any hot gas ingested through the space between adjacent rows of stator vanes and rotor blades.

대표청구항 ▼

A gas turbine engine, comprising: housing means defining a generally annular and axially elongated hot gas flow path for passage of combustion gas, said hot gas flow path being formed radially about and separated by a duct wall having an annular space formed therein; turbine rotor means including a

A gas turbine engine, comprising: housing means defining a generally annular and axially elongated hot gas flow path for passage of combustion gas, said hot gas flow path being formed radially about and separated by a duct wall having an annular space formed therein; turbine rotor means including a rotor disk rotatably supported within said internal engine cavity with a periphery of said rotor disk disposed generally within the annular space formed in said duct wall, and a plurality of rotor blades on said disk periphery and disposed generally within said hot gas flow path, said turbine rotor means and said housing means cooperatively defining a narrow clearance throat therebetween on one side of said turbine rotor means; and a contoured shroud mounted within said internal engine cavity in close running clearance with said rotor disk at said disk periphery, said shroud defining a radially outwardly open and circumferentially extending hot gas recirculation pocket for receiving hot gas ingested said hot gas flow path through said clearance throat and for recirculating the ingested hot gas back through said clearance throat to said hot gas flow path, said pocket having an axial dimension and a radial dimension substantially greater than the dimension of said clearance throat, said contoured shroud comprising a base wall extending radially inwardly from said duct wall, an inboard wall extending from said base wall in an axial direction toward said rotor disk, and an end wall extending from said inboard wall in a radially outward direction and in close running clearance with said rotor disk, said end wall terminating in a circumferentially extending free edge disposed in close proximity to said clearance throat, whereby said recirculation pocket substantially directly receives hot gas ingested through said clearance throat for recirculation back through said clearance throat to said hot gas flow path.