Exchanger on turbine ventilation system

F - Mech Eng,Light,Heat,Weapons – 02 – C

Patent

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Details

F02C 7/18 (2006.01) F01D 5/08 (2006.01) F01D 5/18 (2006.01) F01D 25/12 (2006.01) F02C 1/00 (2006.01) F02C 7/12 (2006.01)

Patent

CA 2475404

The invention relates to a method of supplying cooling air to the hot portions of a turbojet that comprises, from upstream to downstream: a compressor (2); a diffuser (8); a combustion chamber (2); a distributor (13); and a turbine (5) driving said compressor (3), in which method a flow of air (F2) is bled from the flow of air (F1) delivered by the compressor (3), the bled-off flow is cooled in a heat exchanger (22) situated radially outside the combustion chamber (2), and is then directed radially inwards via the stationary blades (14) of the distributor (13) and used for cooling the moving wheel (16) of the turbine (5), the method wherein the flow of cooling air (F2) is bled from the zone (20) of the end of the combustion chamber that surrounds the diffuser (8), and wherein the stationary blades (14) of the distributor (13) are also cooled by a second flow of air (F3) bled from the diffuser.

L'invention concerne un procédé pour fournir un air de refroidissement dans les parties chaudes d'un turboréacteur comportant, d'amont en aval, un compresseur (3), un diffuseur (8), une chambre de combustion (2), un distributeur (13) et une turbine (5) entraînant ledit compresseur (3), procédé selon lequel on prélève un débit d'air (F2) dans le flux d'air (F1) délivré par le compresseur (3), on le refroidit dans un échangeur de chaleur (22) situé radialement à l'extérieur de la chambre de combustion (2), on le dirige radialement vers l'intérieur à travers les aubes fixes (14) du distributeur (13) et on ventile la roue mobile (16) de la turbine (5), caractérisé par le fait que l'on prélève le débit d'air de refroidissement (F2) dans la zone (20) du fond de chambre entourant le diffuseur (8) et par le fait que l'on ventile les aubes fixes (14) du distributeur (13) par un deuxième débit d'air (F3) prélevé en fond de chambre.

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