초록 ▼

From an external turbine chamber (17), cooling air passages are formed through coils mounted in ball-and-socket fashion (26) in a cavity portion (21) above the stationary turbine nozzle vanes (16) from which it escapes downstream through holes (29) in the platform (15) of the stationary vanes (16) i

From an external turbine chamber (17), cooling air passages are formed through coils mounted in ball-and-socket fashion (26) in a cavity portion (21) above the stationary turbine nozzle vanes (16) from which it escapes downstream through holes (29) in the platform (15) of the stationary vanes (16) in the form of jets of air parallel to the flow of the main gas flow to create a cooling film on the leading edge (30) of the shroud (9) of the movable blades (10) of the turbine rotor in order to cool these blade shroud (9). An airtight connection between this supply chamber (17) and the main flow is ensured by a flexible seal (32) formed of elastic blades (33) in sections attached to one end of the downstream flange (14) of the turbine nozzle housing (11) and supported at the other end by the turbine ring (5).

대표청구항 ▼

A cooling device for the peripheral shroud of movable blades of a turbine which includes a main flow through which gas circulates and including a rotor with a turbine ring forming a stationary part of said rotor, comprising: a turbine nozzle located adjacent said movable blades and including a plura

A cooling device for the peripheral shroud of movable blades of a turbine which includes a main flow through which gas circulates and including a rotor with a turbine ring forming a stationary part of said rotor, comprising: a turbine nozzle located adjacent said movable blades and including a plurality of stationary turbine nozzle vanes; an external chamber in communication with an air supply for providing cooling air to said stationary turbine nozzle vanes of said turbine nozzle and passing said air through a cavity portion formed adjacent said turbine nozzle vanes and to said turbine ring; and passage means in communication with said chamber for directing the air toward said peripheral shroud of the movable blades of the turbine rotor for ensuring cooling of said shroud from a leading edge portion thereof located on an upstream side thereof in relation to the direction of said gas circulation in the main flow wherein said passage means further comprises a plurality of cooling holes and means for calibrating said cooling holes so as to allow precise control of the rate of cooling air flowing to said shroud, said cooling holes further being circumferentially slanted for directing along an optimum angle jets of air on said leading edge of said shroud of the movable blades and for obtaining jets of air within a range of direction from parallel to the flow to slightly opposed to the flow without a centripetal radial component and wherein said leading edge portion of said shroud further comprises a raised profile downstream of said cooling holes, said profile being raised in relation to the extension of the shroud itself, thereby allowing a more efficient impingement cooling of said leading edge and a more efficient cooling of said shroud by an improved flow on an internal side of said shroud.