Air cooled turbine airfoil with sequential impingement cooling
First Claim
Patent Images
1. A method of forming a sequential impingement cooling insert for a turbine airfoil comprising the steps of:
- forming a plurality of sheets having an airfoil shape;
photo-etching the plurality of sheets to form plates that form a sequential impingement cooling circuit;
placing Boron between adjacent plates;
compressing the plates together with the plates in position for bonding; and
,securing the plates together using a transient liquid phase bonding process.
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Accused Products
Abstract
An air cooled turbine airfoil such as a stator vane in which the airfoil is hollowed out and an insert is secured within the hollowed out section that produces sequential impingement cooling of the airfoil. The insert is formed from a plurality of plates bonded together outside of or inside of the airfoil to form a single piece insert with the cooling circuit. The plates are bonded together using TLP bonding process with sheets of boron placed between adjacent plates so that no excess material seeps out and into the cooling features formed with the plates. The cooling features of the plates are formed by photo-etching.
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Citations
21 Claims
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1. A method of forming a sequential impingement cooling insert for a turbine airfoil comprising the steps of:
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forming a plurality of sheets having an airfoil shape; photo-etching the plurality of sheets to form plates that form a sequential impingement cooling circuit; placing Boron between adjacent plates; compressing the plates together with the plates in position for bonding; and
,securing the plates together using a transient liquid phase bonding process. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of forming an air cooled turbine airfoil having impingement cooling of the airfoil walls, the method comprising the steps of:
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forming an airfoil with a hollow inner section such that the airfoil walls can be cooled using impingement cooling air; forming a plurality of inserting securing members on the hollow inner section of the airfoil; forming an insert from a plurality of plates that are bonded together to form a sequential impingement cooling circuit to produce impingement cooling on a forward section and an aft section of a pressure side wall and a suction side wall of the airfoil; securing the insert inside the hollow inner section of the airfoil. - View Dependent Claims (9, 10, 11)
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12. A method of forming a highly twisted air cooled turbine airfoil having impingement cooling of the airfoil walls, the method comprising the steps of:
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forming a highly twisted airfoil with a hollow inner section such that the airfoil walls can be cooled using impingement cooling air; forming a plurality of alternating plates having an airfoil shape that forms a sequential impingement cooling circuit for the airfoil walls when bonded together; placing the plurality of plates within the hollow inner section of the airfoil with a bonding agent between adjacent plates; and
,bonding the plurality of plates to form a single piece insert while the plates are inside the airfoil hollow inner section. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A plate used to form an insert that provides sequential impingement cooling for a backside surface of a turbine airfoil, the plate comprising;
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the plate has an airfoil shape with a leading edge region and a trailing edge region with a pressure side surface and a suction side surface extending between the edges; three insert retaining and seal forming members located on the pressure side surface and the suction side surface and the leading edge region of the plate; a first row of impingement cooling holes located along a forward section on the pressure side surface of the plate; a second row of impingement cooling holes located along a forward section on the suction side surface of the plate; a third row of impingement cooling holes located along an aft section on the suction side surface of the plate; a cooling air supply channel located in a forward section of the plate and connected to the first row of impingement cooling holes; a first cooling air passage located in the aft section on the pressure side surface of the plate and connected to the second row of impingement cooling holes; and
,a second cooling air passage located in the aft section on the pressure side surface of the plate and connected to the third row of impingement cooling holes. - View Dependent Claims (19, 20, 21)
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Specification