Turbine blades and turbine blade cooling systems and methods
First Claim
1. A turbine blade comprising:
- an airfoil including an outer wall extending radially outwardly from a root, the outer wall including pressure and suction sides extending laterally from a leading edge to a trailing edge of the airfoil,a tip cap extending between the pressure and suction sides and between the leading and trailing edges,a tip wall extending outwardly from the tip cap, wherein the tip wall includes a recessed portion recessed inboard from the pressure side of the outer wall forming a tip shelf between the outer wall and the recessed portion,an internal cooling circuit extending within the airfoil and being bounded in part by the tip cap,at least one tip shelf hole extending through the tip shelf in flow communication with the internal cooling circuit, andat least one tip wall opening extending through the recessed portion radially outward of the tip shelf in flow communication with the internal cooling circuit.
3 Assignments
0 Petitions
Accused Products
Abstract
A turbine blade with improved tip cooling includes an airfoil having a tip cap and a tip wall extending outwardly from the tip cap. A recessed portion of the tip wall forms a tip shelf. At least one tip shelf hole extends through the tip shelf in flow communication with an internal airfoil cooling circuit. At least one tip wall opening extends through the recessed portion of the tip wall radially outward of the tip shelf in flow communication with the internal cooling circuit. The recessed tip wall portion may be tapered from a wider base to a minimum thickness. In a cooling method, cooling air channeled through the tip wall openings joins and mixes with a stream of hot combustion gases downstream of where cooling air channeled through the tip shelf openings joins and mixes with the stream of hot gasses to enhance convection cooling of the blade tip. A system for cooling a blade includes at least one tip shelf hole and at least one tip wall opening for channeling cooling air from an internal cooling circuit toward a stream of hot combustion gases for improved cooling of at least the blade tip.
-
Citations
16 Claims
-
1. A turbine blade comprising:
-
an airfoil including an outer wall extending radially outwardly from a root, the outer wall including pressure and suction sides extending laterally from a leading edge to a trailing edge of the airfoil, a tip cap extending between the pressure and suction sides and between the leading and trailing edges, a tip wall extending outwardly from the tip cap, wherein the tip wall includes a recessed portion recessed inboard from the pressure side of the outer wall forming a tip shelf between the outer wall and the recessed portion, an internal cooling circuit extending within the airfoil and being bounded in part by the tip cap, at least one tip shelf hole extending through the tip shelf in flow communication with the internal cooling circuit, and at least one tip wall opening extending through the recessed portion radially outward of the tip shelf in flow communication with the internal cooling circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method comprising:
-
a) channeling cooling air from an internal cooling circuit of an airfoil through at least one tip shelf hole extending through a tip shelf formed between a recessed tip wall portion of a tip wall recessed inboard from a pressure side of an airfoil outer wall and the airfoil outer wall; and b) channeling cooling air from the internal cooling circuit through at least one tip wall opening extending through the recessed tip wall portion; wherein the cooling air channeled through the at least one tip wall opening joins and mixes with a stream of hot combustion gases downstream of where cooling air channeled through the at least one tip shelf hole joins and mixes with the stream of hot combustion gases. - View Dependent Claims (10, 11, 12)
-
-
13. A system comprising:
-
an internal cooling circuit of an airfoil; at least one tip shelf hole extending through a tip shelf in flow communication with the internal cooling circuit, wherein the tip shelf is formed between a recessed portion of a tip wall extending outwardly from a tip cap and an outer wall of the airfoil; and at least one tip wall opening extending through the recessed tip wall portion in flow communication with the internal cooling circuit. - View Dependent Claims (14, 15, 16)
-
Specification