Patent ID: 7377746
Filing Date: 2008-05-27
Classification: B22C,F01D,F05D,Y02T,Y10T

Abstract:
1. An airfoil, comprising at least first and second cast, axially-stacked circuits, each circuit including multiple serpentine air flow passages positioned laterally between a pressure sidewall side and a suction sidewall side of respective ones of the circuits, wherein the serpentine circuits are positioned in a mid chord region of the airfoil and the respective serpentine air flow passages are defined by at least first and second 180 degree turns therein, and further wherein the serpentine airflow passages extend radially-outwardly adjacent the suction sidewall side of a root of the airfoil, the first 180 degree turn is positioned at a tip of the airfoil, the serpentine air flow passages extend radially-inwardly to a center passage of the airfoil, the second 180 degree turn is positioned at the root of the airfoil, and the serpentine air flow passages extend radially-outwardly adjacent the pressure sidewall side of the airfoil.