GAS TURBINE BLADE WITH COOLED PLATFORM

摘要

A turbine blade (18) has a cooling air flow path specifically directed toward cooling the platform portion (46) of the blade root (44). Two cooling air passages (48, 49) are formed in the blade root platform just below its upper surface. Each passage (48, 49) extends radially outward fron an inlet that receives a flow of cooling air (32) and then extends axially along almost the entire length of the platform (46). Each passage (48, 49) also has an outlet (52, 53) formed in the downstream face (61) of the platform (46) that allows the cooling air (32) to exit the platform (46) and enter the hot gas flow path. The passages (48, 49) are formed in portions of the platform (46) that overhang the shank portion of root.