Diffuser having blades with apertures

F - Mech Eng,Light,Heat,Weapons – 04 – D

Patent

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Details

F04D 27/02 (2006.01) F04D 29/44 (2006.01) F04D 29/54 (2006.01) F04D 29/68 (2006.01)

Patent

CA 2740036

The invention relates to a diffuser (18) for a mixed flow or centrifugal compressor of a gas turbine, comprising at least one blade (20, 120) having a pressure side (I), a suction side (E), and a first flank (22, 122), said blade being provided with a plurality of apertures (26, 126, 34, 134, 32, 132) in communication with the suction side (E) and/or the pressure side (I) and communicating with at least one recess provided in the blade, said recess (30, 36, 200, 210) extending transversely relative to the blade and in communication with the first flank. The invention is characterised in that the cross-section of the recess (30, 36, 200, 210) varies in the transverse direction of the blade according to a law of increasing variation towards the first flank.

L'invention concerne un diffuseur (18) pour un compresseur mixte ou centrifuge d'une turbine à gaz, comportant au moins une aube (20, 120) présentant un intrados (I), un extrados (E) et un premier flanc (22, 122), ladite aube étant pourvue d'une pluralité d'orifices (26, 126, 34, 134, 32, 132) débouchant sur l'extrados (E) et/ou l'intrados (I) et communiquant avec au moins une cavité ménagée dans l'aube, ladite cavité s'étendant transversalement (30, 36, 200, 210) par rapport à l'aube tout en débouchant sur le premier flanc. L'invention se caractérise par le fait que la section transversale de la cavité (30, 36, 200, 210) varie dans la direction transversale de l'aube selon une loi de variation croissante vers le premier flanc.

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