Cooling arrangement for turbine rotor

F - Mech Eng,Light,Heat,Weapons – 01 – D

Patent

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F01D 5/08 (2006.01) F01D 5/30 (2006.01)

Patent

CA 2312977

A cooling arrangement for a bladed rotor in a gas turbine engine, wherein each of the blades includes cooling air passages and a cover with curved fins is mounted adjacent to but connected to the rotor and spaced apart slightly from the rotor disc to form a passageway for the cooling fluid. The cooling arrangement includes a tapered, conically shaped inlet formed in the cooling passage which then diverges to form a diffuser near the outer end of the passageway. The cover includes an enlarged inner portion and a thin outer wall portion beyond the free ring diameter. A hammerhead is formed at the outer periphery of the cover whereby the hammerhead will move closer to the disc in response to centrifugal forces, thus sealing the passage.

La présente invention concerne un dispositif de refroidissement pour un rotor à pales dans une turbine à gaz, dans lequel chacune des pales comporte des passages d'air de refroidissement et un couvercle ayant des ailettes courbes est monté contiguës mais reliées au rotor and légèrement à distance du disque de rotor permettant le passage du fluide de refroidissement. Le dispositif de refroidissement comporte une entrée effilée à configuration conique formée dans le passage de refroidissement qui ensuite bifurque afin de prendre la forme d'un diffuseur à proximité de l'extrémité extérieure du passage. La couvercle comprend un partie intérieure élargie et une partie mince de la paroi extérieure au delà du diamètre de l'anneau libre. Une tête de marteau se forme à la périphérie extérieure du couvercle permettant ainsi à la tête de marteau de se rapproche du disque sous l'effet des forces centrifuges, obturant ainsi le passage.

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