Blade tip cooling
A casting core may include a core body and a tip comb extending from a tip region of the core body. The tip comb may be integrally formed with the core body. The tip comb may comprise a first casting pedestal and a second casting pedestal. The first casting pedestal and the second casting pedestal may define an aperture having a tapered geometry.
1. An airfoil, comprising:
an airfoil body defining an airflow path;
a tip shelf defined in a tip region, wherein the tip region is disposed at a radially outer edge of the airfoil body, wherein the tip shelf comprises a pressure side wall portion and a radially outward wall portion; and
a first pedestal and a second pedestal disposed in the airflow path at the tip region;
wherein the first pedestal and the second pedestal define a cooling passage having a proximal end and a distal end;
wherein the proximal end of the cooling passage has a first width and the distal end of the cooling passage has a second width, wherein the cooling passage comprises an outlet defined in the tip shelf;
wherein the first width is greater than the second width.
2. The airfoil of claim 1 , wherein the first pedestal and the second pedestal have a tapered geometry.