Patent ID: 8757961

Claim:
An industrial engine turbine stator vane comprising: an airfoil extending between an outer diameter endwall and an inner diameter endwall; a three-pass aft flowing serpentine cooling circuit formed within the airfoil with a first leg located along a leading edge of the airfoil and a third leg located adjacent to a trailing edge region of the airfoil; a row of exit holes located along the trailing edge of the airfoil and connected to the third leg; an outer diameter endwall turn channel connected between the second leg and the third leg; an inner diameter endwall turn channel connected between the first leg and the second leg; a rib extends into the first leg and separates a purge air channel from the inner diameter endwall turn channel; the purge air channel opens into a front rim cavity; and, a purge air hole is connected to an end of the third leg and opens into an aft rim cavity.