Patent ID: 9022737
Filing Date: 2015-05-05
Classification: F01D,F05D

Abstract:
1. A turbine airfoil comprising: a wall having a leading edge, a trailing edge, a pressure side, a suction side, a tip end, and a root end, an interior surface and an exterior surface; a cooling channel defined by the interior surface that extends through the wall between the pressure side and the suction side; a trench extending in a spanwise direction along the exterior surface of the wall and being recessed from the exterior surface towards the interior surface to form a back wall, the back wall being contoured to include at least one undulation; and a plurality of cooling holes extending through the back wall of the trench to place the cooling channel in flow communication with the exterior surface, each cooling hole having a cross-sectional area and a centerline passing through a geometric center of the cross-sectional area, wherein at least one cooling hole is oriented such that a first angle defined between a centerline of the at least one cooling hole and a first tangent of the undulation is less than a second angle defined between the centerline of the at least one cooling hole and a second tangent passing through the undulation at its peak.