Improvements to turbine blade cooling air exhaust slots

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

Patent

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Details

F01D 5/14 (2006.01) F01D 5/30 (2006.01)

Patent

CA 2493094

A turbine blade of a turbomachine, having at least a bottom platform (24) connected to the base of the blade (16) by a bottom connection zone (26), and a cooling circuit consisting of at least one cooling cavity, of a plurality of evacuation slots (30, 30a) arranged along the trailing edge of the blade (22), said blade having a bottom evacuation slot (30a) that is disposed near the blade base (16), the bottom evacuation slot (30a) including an end wall (36) provided with an opening (38) that opens into the cavity, a setback wall (32), a bottom wall (34) disposed beside the blade base, a bottom edge (40) formed between the setback wall (32) and the bottom wall (34), and a bottom shoulder (42) formed between the bottom wall and the bottom connection zone (26), both the bottom edge (40) of the bottom evacuation slot (42) and the bottom shoulder of the bottom evacuation slot (30a) having respective right sections of substantially rounded shape, thereby avoiding any protruding angles between the opening (38) of said slot and the bottom connection zone (26).

Aube de turbine de turbomachine, comportant au moins une plate-forme inférieure (24) reliée au pied de l'aube (16) par une zone de raccordement inférieure (26), et un circuit de refroidissement composé d'au moins une cavité de refroidissement, d'une pluralité de fentes d'évacuation (30, 30a) aménagées le long du bord de fuite (22) de l'aube dont une fente d'évacuation inférieure (30a) disposée au voisinage du pied d'aube (16), la fente d'évacuation inférieure (30a) comportant une paroi latérale (36) munie d'une ouverture (38) s'ouvrant dans la cavité, une paroi en renfoncement (32), une paroi inférieure (34) disposée du côté du pied d'aube, une arête inférieure (40) formée entre la paroi en renfoncement (32) et la paroi inférieure (34), et un rebord inférieur (42) formé entre la paroi inférieure et la zone de raccordement inférieure (26), l'arête inférieure (40) et le rebord inférieur (42) de la fente inférieure (30a) présentant chacun une section droite de forme sensiblement arrondie de façon à supprimer toute angle saillant entre l'ouverture (38) de la fente et la zone de raccordement inférieure (26).

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