COOLABLE AIRFOIL STRUCTURE.

摘要

A coolable airfoil 10 has a plurality of spanwisely extending passages. Various construction details are developed to increase the cooling effectiveness of the internal structure and decrease the need for cooling air. In one particular embodiment, a leading edge passage 56 has film cooling air flowing over the passage to shelter the passage from the hot working medium gases. This sheltered cooling air is then mixed with heated cooling air from a tortuous passage 84, 92 flowing through the mid-chord region 68 of the blade. In one embodiment, the coating air is supplied to a chordwisely extending tip passage 74 to cool the airfoil tip region and is mixed in the passage 74.