COOLED GAS TURBINE BLADE

摘要

A gas turbine cooling blade wherein the thermal stress in, especially, the portions thereof which are around shower head cooling air blowout holes in a front edge section thereof is reduced to prevent the occurrence of cracks therein, wherein a front edge section (2) of a cooling blade (1) is provided with air blowout holes (4), from which the cooling air flowing in a cooling air passage (15) in the interior of the cooling blade is blown out onto a blade surface of the front edge section (2) of the cooling blade (1) to showerhead cool the surface. Conventional air blowout holes (14) are provided diagonally with respect to a front edge section (2), so that acute angle portions (30) are formed in outlets and inlets of these air blowout holes (14), thermal stress causing cracks to occur around the air blowout holes (14). The air blowout holes (4) in the present invention are made so as to cross at substantially right angles the outer surface of the front edge section of the cooling blade (1) to eliminate the above-mentioned acute angle portions, and this enables the thermal stress to be reduced and the occurrence of cracks to be avoided.