US 11,781,433 B1
Turbine blade tip cooling hole arrangement
Carlos Calixtro, Atlanta, GA (US); Yanhu Guo, East Hartford, CT (US); and Nelson D. Gonzalez, East Hartford, CT (US)
Assigned to RTX CORPORATION, Farmington, CT (US)
Filed by Raytheon Technologies Corporation, Farmington, CT (US)
Filed on Dec. 8, 2022, as Appl. No. 18/77,824.
Claims priority of provisional application 63/265,895, filed on Dec. 22, 2021.
Int. Cl. F01D 5/18 (2006.01)
CPC F01D 5/186 (2013.01) [F05D 2240/307 (2013.01); F05D 2250/74 (2013.01); F05D 2260/202 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A turbine blade for use in a gas turbine engine, the turbine blade comprising:
a plurality of cooling holes positioned adjacent a tip of the turbine blade, wherein the plurality of cooling holes comprises six cooling holes, including a first cooling hole, a second cooling hole, a third cooling hole, a fourth cooling hole, a fifth cooling hole, and a sixth cooling hole;
wherein each of the plurality of cooling holes extend from an interior of the turbine blade through a turbine blade pressure-side sidewall toward a trailing edge of the turbine blade at an acute angle with respect to a vertical axis extending from a base of the turbine blade to the tip of the turbine blade;
wherein each of the plurality of cooling holes are offset from the tip of the turbine blade by less than 2.0% of a total span between the base of the turbine blade and the tip of the turbine blade; and
wherein:
the first cooling hole extends toward the trailing edge of the turbine blade at an angle ranging between 25 degrees and 30 degrees with respect to the vertical axis;
the second cooling hole extends toward the trailing edge of the turbine blade at an angle ranging between 25 degrees and 30 degrees with respect to the vertical axis;
the third cooling hole extends toward the trailing edge of the turbine blade at an angle ranging between 25 degrees and 30 degrees with respect to the vertical axis;
the fourth cooling hole extends toward the trailing edge of the turbine blade at an angle ranging between 25 degrees and 30 degrees with respect to the vertical axis;
the fifth cooling hole extends toward the trailing edge of the turbine blade at an angle ranging between 25 degrees and 30 degrees with respect to the vertical axis; and
the sixth cooling hole extends toward the trailing edge of the turbine blade at an angle ranging between 55 degrees and 60 degrees with respect to the vertical axis.