Patent ID: 6890153

Claim:
A turbine airfoil comprising: a generally concave pressure sidewall integrally joined to a laterally opposite, generally convex suction sidewall at opposite leading and trailing edges, and at multiple bridges including a forward bridge spaced between said leading and trailing edges to define a serpentine flow circuit feeding a first flow channel extending behind said leading edge between a root and a longitudinally opposite tip of said airfoil; said forward bridge including a row of impingement holes for channeling cooling air into said first channel; said first channel including a row of fins protruding therein from the back side of said leading edge, a row of first turbulators protruding therein from said pressure sidewall, and row of second turbulators protruding therein from said suction sidewall; and said fins and first and second turbulators having different configurations for increasing internal surface area and heat transfer for back side cooling said leading edge by said cooling air.