Patent ID: 8221055

Claim:
A turbine stator vane comprising: an OD endwall and an ID endwall; a vane airfoil extending between the OD endwall and the ID endwall; an internal airfoil cooling circuit to provide cooling for the airfoil; a vortex tube formed within a forward section of the OD endwall and the ID endwall, the vortex tube extending from one side of the endwall to the opposite side of the endwall; a row of cooling air feed holes connected to an endwall cooling air supply cavity and opening into the vortex tube; a row of cooling air discharge slots connected to the vortex tube on a side away from the feed holes and opening onto an external surface of the endwall; and, the feed holes and the discharge slots are offset from a central axis of the vortex tube such that a vortex flow of cooling air is formed within the vortex tube.