Internally cooled airfoil

Claim 1

A hollowed, axial turbine fluid foil having a pressure side and a suction side each extending in a chord-wise direction from a leading edge to a trailing edge of the fluid foil; a plurality of internal ribs extending internally across the fluid foil between the pressure and suction sides to define separate internal cavities spaced in a chord-wise direction from one another; means for supplying heat exchange fluid into a mid-chord located one of said cavities, said internal ribs having passages therethrough for delivering heat exchange fluid to adjacent cavities in a generally chord-wise direction, at least one of said internal ribs and its associated passages being configured and arranged whereby heat exchange fluid flowing through said associated passages impinges the internal surfaces of both said pressure side and suction side of the fluid foil and impinges the next adjacent internal rib to produce impingement heat exchange therewith, said one internal rib and its associated passages arranged whereby fluid flowing through said associated passages issues substantially directly toward corners formed between the next adjacent rib and the internal surfaces of said pressure side and said suction side; and said one internal rib including first and second straight segments extending respectively from the pressure and suction sides and joined with one another, said first and second segments being angled to one another.