Patent ID: 8920124

Claim:
A turbine blade, comprising: a generally elongated airfoil having a leading edge, a trailing edge, a tip at a first end, and a root coupled to the airfoil at an end generally opposite the first end for supporting the airfoil and for coupling the airfoil to a disc, a pressure sidewall extending from the leading edge to the trailing edge and a suction sidewall extending from the leading edge to the trailing edge and positioned on an opposite side of the generally elongated airfoil from the pressure sidewall and at least one cavity forming an internal cooling system; a squealer tip at the first end, wherein the squealer tip is formed from a radially extending pressure side tip wall with an outer surface that is flush with an outer surface of the pressure sidewall, a radially extending suction side tip wall with an outer surface that is flush with an outer surface of the suction sidewall, and an axially extending tip wall extending between the pressure side tip wall and the suction side tip wall; wherein the axially extending tip wall is formed from at least two outer linear surfaces joined together at an intersection that form a concave axially extending tip wall; wherein an inner surface of the axially extending tip wall which forms a radially outer boundary of the at least one cavity forming the internal cooling system has a convex surface with radially outermost points of the convex surface at intersections with the pressure and suction sidewalls.