Offset counterbore for airfoil cooling hole

摘要

The present application thus provides an airfoil for use in a turbine. The airfoil may include a wall, an internal cooling plenum, and a cooling hole extending through the wall to the cooling plenum. The cooling hole may include an offset counterbore therein.

主权项

1. An airfoil for use in a turbine, comprising:
a wall comprising an outer surface; an internal cooling plenum; and a cooling hole extending from the outer surface of the wall to the internal cooling plenum, the cooling hole comprising an offset counterbore and a metering hole in communication with the offset counterbore; wherein the offset counterbore comprises an amount of a spray coating therein while the metering hole remains unobstructed.