Patent ID: 7568887

Claim:
A turbine airfoil for use in a high temperature turbine, the airfoil comprising: an airfoil wall forming a pressure side and a suction side, and a leading edge and a trailing edge; a five pass serpentine flow cooling circuit within the airfoil, the five pass serpentine circuit comprising a first up-pass leg adjacent to the pressure side of the airfoil, a second down-pass leg adjacent to the suction side of the airfoil, a third up-pass leg adjacent to the pressure side of the airfoil, a fourth down-pass leg adjacent to the suction side of the airfoil, and a fifth up-pass leg positioned along the trailing edge of the airfoil; a collector cavity in fluid communication with the serpentine flow circuit and fluidly positioned between the second leg and the third leg; the collector cavity is positioned between the first four legs of the serpentine flow circuit; and, the collector cavity includes a first collector cavity positioned between the first and second legs, a second collector cavity positioned between the third and fourth legs, the first collector cavity in fluid communication with the second leg, the second collector cavity in fluid communication with the third leg, and a core tie hole providing a fluid communication between the two cavities.