Patent ID: 8118553

Claim:
A turbine airfoil, comprising: a generally elongated, hollow airfoil having a leading edge, a trailing edge, a tip at a first end, a root coupled to the airfoil at an end generally opposite to the first end for supporting the airfoil and for coupling the airfoil to a disc, and a cooling system formed from at least one cavity in the elongated, hollow airfoil; an outer wall forming an outer surface of the generally elongated airfoil; wherein the cooling system is formed from dual serpentine cooling channels comprising a radially inward serpentine cooling channel of the cooling system that is formed from a winding channel with portions extending in a spanwise direction between the root and a point between the root and the tip and a radially outward serpentine cooling channel of the cooling system that is formed from a winding channel with portions extending in a spanwise direction between the tip and the point between the root and the tip; a plurality of pin fins extending between the outer wall forming the pressure side and the outer wall forming the suction side in the radially inward serpentine cooling channel; and a plurality of protrusions forming trip strips extending from the outer wall forming the pressure side and from the outer wall forming the suction side in the radially outward serpentine cooling channel.