Moving blade for a high pressure turbine, the blade having a trailing edge of improved thermal behavior

Abstract

A moving blade for a high pressure turbine of a turbomachine, the blade having at least one cooling circuit comprising at least one cavity extending radially between a tip and a base of the blade, at least one air admission opening at a radial end of the cavity(ies) to feed the cooling circuit(s) with cooing air, and a plurality of slots opening out into the cavity(ies) and opening out into the concave side of the blade between the base and the tip of the blade in a manner that is substantially perpendicular to a longitudinal axis of the blade, a connection zone being provided between a slot closest to the base of the blade and a top surface of a platform defining an inside wall for a stream of combustion gas flowing through the high pressure turbine, and the moving blade further comprising an additional cooling air exhaust slot opening out into said cavity and opening out into said connection zone in line with the trailing edge.

What is claimed is:  
     
         1 / A moving blade for a high pressure turbine of a turbomachine, the blade having at least one cooling circuit comprising at least one cavity extending radially between a tip and a base of the blade, at least one air admission opening at a radial end of the cavity(ies) to feed the cooling circuit(s) with cooing air, and a plurality of slots opening out into the cavity(ies) and opening out into the concave side of the blade between the base and the tip of the blade in a manner that is substantially perpendicular to a longitudinal axis of the blade, a connection zone being provided between a slot closest to the base of the blade and a top surface of a platform defining an inside wall for a stream of combustion gas flowing through the high pressure turbine, the blade further comprising an additional cooling air exhaust slot opening out into said cavity and opening out into said connection zone in line with the trailing edge.  
     
     
         2 / A blade according to  claim 1 , wherein said additional slot presents a shape taken from the following group of shapes: oblong; rectangular; triangular; and an upside-down T-shape.  
     
     
         3 / A blade according to  claim 2 , wherein said additional slot presents an outlet section which is different from the section of its feed channel.  
     
     
         4 / A blade according to  claim 1 , wherein said additional slot is obtained directly by casting.  
     
     
         5 / A blade according to  claim 1 , wherein a longitudinal bottom end of the additional slot is disposed immediately above said top surface of the platform.  
     
     
         6 / A high pressure turbine of a turbomachine, the turbine including a plurality of moving blades according to  claim 1.