TURBINE ROTOR BLADES WITH IMPROVED TIP PORTION COOLING HOLES
First Claim
1. A turbine rotor blade for a turbine section of an engine, the turbine rotor blade comprising:
- a platform; and
an airfoil extending from the platform into a mainstream gas path of the turbine section, the airfoil comprisinga first side wall;
a second side wall joined to the first side wall at a leading edge and a trailing edge;
a tip cap extending between the first side wall and the second side wall;
a first parapet wall extending from the first side wall; and
a first cooling hole through the tip cap and the first parapet wall configured to deliver cooling air, the first cooling hole having a closed channel section and an open channel section, the open channel section forming a slot.
1 Assignment
0 Petitions
Accused Products
Abstract
A turbine rotor blade is provided for a turbine section of an engine. The turbine rotor blade includes a platform and an airfoil extending from the platform into a mainstream gas path of the turbine section. The airfoil includes a first side wall; a second side wall joined to the first side wall at a leading edge and a trailing edge; a tip cap extending between the first side wall and the second side wall; a first parapet wall extending from the first side wall; and a first cooling hole through the tip cap and the first parapet wall configured to deliver cooling air. The first cooling hole has a closed channel section and an open channel section. The open channel section forms a slot.
18 Citations
20 Claims
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1. A turbine rotor blade for a turbine section of an engine, the turbine rotor blade comprising:
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a platform; and an airfoil extending from the platform into a mainstream gas path of the turbine section, the airfoil comprising a first side wall; a second side wall joined to the first side wall at a leading edge and a trailing edge; a tip cap extending between the first side wall and the second side wall; a first parapet wall extending from the first side wall; and a first cooling hole through the tip cap and the first parapet wall configured to deliver cooling air, the first cooling hole having a closed channel section and an open channel section, the open channel section forming a slot. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for manufacturing a turbine rotor blade, comprising the steps of:
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forming the turbine rotor blade including a tip portion with a first parapet wall, a second parapet wall, a tip cap extending between the first and second parapet walls, and a cooling channel at least partially defined by the tip cap; forming a step between the first parapet wall and the tip cap; forming an initial hole with a longitudinal axis by inserting a tool from a tip edge on the first parapet wall to the cooling channel; removing the tool along the longitudinal axis of the initial hole to a height approximately equal to the step; and removing the tool from the first parapet wall in a generally axial direction to form a cooling hole. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for manufacturing a turbine rotor blade, comprising the steps of:
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forming the turbine rotor blade including a tip portion with a first parapet wall, a second parapet wall, a tip cap extending between the first and second parapet walls, and a cooling channel at least partially defined by the tip cap; forming a step between the first parapet wall and the tip cap; forming an initial hole between a tip edge on the first parapet wall and the cooling channel; and forming a slot between the initial hole and a side surface of the first parapet wall to result in a first cooling hole. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification