Patent ID: 8459935

Claim:
An air cooled turbine stator vane comprising: an endwall forming a hot gas flow path through the vane; the endwall including a hot gas flow side and an impingement cooling air side; a plurality of separated impingement and diffusion chambers formed within the endwall and located adjacent to the hot gas flow side such that near wall cooling occurs when cooling air passes through the impingement chambers; adjacent impingement and diffusion chambers being substantially parallel to each other as the impingement chambers extend around the airfoil of the vane; a plurality of cooling air inlet feed holes connecting an upstream one of the plurality of impingement and diffusion chambers to a cooling air supply; and, a plurality of near wall cooling channels connecting adjacent impingement and diffusion chambers, the near wall cooling channels being located adjacent to the hot gas flow side of the endwall to provide near wall cooling to the endwall.