Airfoil having a film hole

An airfoil comprising:

• a wall having a first surface and a second surface opposite the first surface, the first surface at least partially defining an interior of the airfoil;
• a protuberance including a first opposing surface and a second opposing surface, wherein the first opposing surface extends from the first surface at a first location and the second opposing surface extends from the first surface at a second location, the first location and the second location located on opposite sides of the protuberance;
• a film hole extending through the wall between an inlet and an outlet to convey cooling film, the outlet defined in a portion of the second surface;
• and
• a recess defined in a portion of the protuberance, wherein the inlet is defined in a portion of the recess, wherein the recess is symmetric about a geometric plane intersecting a halfway point between the first location and the second location, wherein the geometric plane is perpendicular to at least one of the first surface or the second surface.

A turbine blade comprising:

• a wall having a first surface and a second surface opposite the first surface, the first surface positioned around and contiguous with an interior of the airfoil;
• a protuberance including a first opposing surface and a second opposing surface, wherein the first opposing surface extends from the first surface at a first location and the second opposing surface extends from the first surface at a second location, the first location and the second location located on opposite sides of the protuberance;
• a film hole extending through the wall between an inlet and an outlet to convey cooling film, the outlet defined in a portion of the second surface;
• and
• a recess defined in a portion of the protuberance, wherein the inlet is defined in a portion of the recess, wherein the recess is symmetric about a geometric plane intersecting a halfway point between the first location and the second location, wherein the geometric plane is perpendicular to at least one of the first surface or the second surface, wherein the portion of the recess in which the inlet is defined is positioned outside of the geometric plane.