Cooling of upstream flange of high pressure turbine by...

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

Patent

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F01D 5/08 (2006.01) F01D 5/30 (2006.01) F01D 11/02 (2006.01) F01D 25/12 (2006.01)

Patent

CA 2430143

The invention concerns a device for ventilating a high-pressure turbine rotor which comprises a turbine disk (3) and an upstream flange (5). A first vane cooling circuit delivers a first air flow (C1), via primary injectors (15) and holes (11) in the flange (5). A second cooling circuit delivers a second air flow (C2) through a discharge labyrinth (18) located downstream of the compressor, one part of this second air flow serving to cool the upstream upper face of the flange through a second labyrinth (22) located below the primary injectors (15). A bypass is provided between the first circuit and the body (23) located downstream of the second labyrinth (22) and delivers a third flow (C1a) placed in pre-rotation by means of additional injectors (30) in the form of inclined drill-holes.

L'invention concerne un dispositif de ventilation d'un rotor de turbine à haute pression qui comporte un disque de turbine (3) et un flasque amont (5). Un premier circuit de refroidissement des aubes délivre un premier débit d'air (C1), via des injecteurs principaux (15) et des trous (11) ménagés dans le flasque (5). Un deuxième circuit de refroidissement délivre un deuxième débit d'air (C2) à travers un labyrinthe de décharge (18) situé en aval du compresseur, une partie de ce deuxième débit servant au refroidissement de la face supérieure amont du flasque au travers d'un deuxième labyrinthe (22) situé sous les injecteurs principaux (15). Une dérivation est prévue entre le premier circuit et l'enceinte (23) située en aval du deuxième labyrinthe (22) et délivre un troisième débit (C1a) mis en pré-rotation au moyen d'injecteurs additionnels (30) réalisés sous forme de perçages inclinés.

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