COOLED GAS TURBINE BLADE

摘要

The present invention relates to a cooled blade of a gas turbine, and in particular an object of the present invention is to reduce thermal stress around air-transpiration holes (4) provided for shower-head cooling of a leading edge portion of a blade. A number of air-transpiration holes (4) are provided at a leading edge portion (2) of a cooled blade (1). Cooling air flowing through a cooling air passage (15) formed inside of the blade blowout to the blade surface of the leading edge portion (2) of the cooled blade (1) by way of the air-transpiration holes (4), to thereby shower-head cool the surface of the leading edge portion (2). In the conventional blade, the air-transpiration holes (14) are formed obliquely to the leading edge portion (2), whereby acute-angled portions (30) are formed at inlet/outlet ports of the air-transpiration holes (14) in the leading edge portion (2), and thus cracks due to thermal stress develop around the air-transpiration holes (14). In contrast, according to the present invention, the air-transpiration holes (4) are formed so as to extend substantially orthogonal to the leading edge surface of the cooled blade (1) such that the acute-angled portions are eliminated, whereby thermal stress can be reduced and thus the cracks can be prevented.