Patent ID: 7597540

Claim:
A turbine airfoil with a showerhead arrangement to provide cooling for the leading edge of the airfoil, the airfoil having an impingement cavity to deliver cooling air to film cooling holes forming the showerhead, the showerhead arrangement comprising: a first row of film cooling holes located in a stagnation point on the leading edge of the airfoil, the first row of cooling holes having an ejecting direction in one of an upward direction and a downward direction; a second row of film cooling holes adjacent to the first row and on the pressure side of the leading edge; a third row of film cooling holes adjacent to the first row and on the suction side of the leading edge; the second and third row of film cooling holes having an ejecting direction in the other of the upward and downward direction opposed to the first row direction; and, the three rows of film cooling holes each extends along substantially all of the airfoil surface in a spanwise direction.