Patent ID: 8011881

Claim:
A turbine vane comprising: An outer diameter endwall and an inner diameter endwall; An airfoil extending between the outer diameter endwall and the inner diameter endwall; An outer diameter endwall cooling circuit fanned within the outer diameter endwall; An inner diameter endwall cooling circuit formed within the inner diameter endwall; A multiple pass serpentine flow cooling circuit formed within the airfoil; A cooling air supply channel formed within the outer diameter endwall cooling circuit and connected to the first leg of the multiple pass serpentine circuit; A first to second cooling passage formed in the ID endwall cooling circuit to connect the first leg to the second leg; A second to third cooling passage formed in the OD endwall cooling circuit to connect the second leg to the third leg; A third to fourth cooling passage formed in the ID endwall cooling circuit to connect the third leg to the fourth leg; A fourth to fifth cooling passage formed in the OD endwall cooling circuit to connect the fourth leg to the fifth leg; and, A row of exit cooling holes connected to the fifth leg to discharge cooling air from the ID endwall cooling circuit.