Patent ID: 7334992

Claim:
A turbine blade cooling system, comprising a turbine blade having a trailing edge, a concave side, and a convex side, feed and transition cavities disposed generally medially of and bounded by said concave and convex sides of said turbine blade in said trailing edge, at least one set of impingement holes disposed in a rib separating said feed and transition cavities such that cooling air supplied to said feed cavity flows through each of said impingement holes to cool both said concave and convex sides of said turbine blade, each impingement hole having a central longitudinal axis which is closer to a nearest portion of an edge of the blade at one of the concave and convex sides relative to a nearest portion of an edge of the blade at the other of the concave and convex sides wherein cooling of said one side relative to said other side is enhanced by the closeness of said impingement holes to said one side.