Cooling of turbine blade suction tip rail
First Claim
1. A turbine blade comprising:
- an airfoil including an airfoil outer wall extending radially outwardly from a blade root;
a blade tip surface located at an end of said airfoil distal from said root, and including pressure and suction sides joined together at chordally spaced apart leading and trailing edges of said airfoil;
a squealer tip rail extending radially outwardly from said blade tip surface and including an aft portion extending chordally between said leading edge and said trailing edge adjacent said trailing edge; and
a plurality of chordally spaced film cooling holes provided in a surface of said suction side and providing a flow of cooling fluid along said squealer tip rail surface at said suction side, wherein said film cooling holes are located in at least a portion of said squealer tip rail.
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Accused Products
Abstract
A turbine blade including an airfoil, the airfoil including an airfoil outer wall having pressure and suction sidewalls joined together at chordally spaced apart leading and trailing edges extending radially outwardly from a blade root to a blade tip surface. A continuous squealer tip rail extends radially outwardly from and substantially continuously around the blade tip surface forming a radially outwardly open squealer pocket. The squealer tip rail includes an aft portion adjacent to the trailing edge, where the pressure side tip rail is discontinued in the chordal location of the aft portion. A plurality of chordally spaced film cooling holes are provided in a surface of the suction sidewall and provides a cooling fluid flow along the aft portion of the squealer tip rail surface to define a sub-boundary layer or film of cooling fluid between a hot gas vortex flow and the aft portion of the squealer tip rail at the suction sidewall.
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Citations
20 Claims
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1. A turbine blade comprising:
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an airfoil including an airfoil outer wall extending radially outwardly from a blade root; a blade tip surface located at an end of said airfoil distal from said root, and including pressure and suction sides joined together at chordally spaced apart leading and trailing edges of said airfoil; a squealer tip rail extending radially outwardly from said blade tip surface and including an aft portion extending chordally between said leading edge and said trailing edge adjacent said trailing edge; and a plurality of chordally spaced film cooling holes provided in a surface of said suction side and providing a flow of cooling fluid along said squealer tip rail surface at said suction side, wherein said film cooling holes are located in at least a portion of said squealer tip rail. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A turbine blade comprising:
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an airfoil including an airfoil outer wall with pressure and suction sidewalls joined together at chordally spaced apart leading and trailing edges of said airfoil and extending radially outwardly from a blade root to a blade tip surface; said blade tip surface including pressure and suction sides coinciding with said pressure and suction sidewalls; a continuous squealer tip rail extending radially outwardly from and substantially continuously around said blade tip surface forming a radially outwardly open squealer pocket; said squealer tip rail including an aft portion extending chordally between said leading edge and said trailing edge adjacent said trailing edge; and a plurality of chordally spaced film cooling holes provided in a surface of said suction side and providing a flow of cooling fluid along said aft portion of said squealer tip rail surface at said suction side, wherein said film cooling holes are located in at least a portion of said squealer tip rail. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A turbine blade comprising:
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an airfoil including an airfoil outer wall with pressure and suction sidewalls joined together at chordally spaced apart leading and trailing edges of said airfoil and extending radially outwardly from a blade root to a blade tip surface; said blade tip surface including pressure and suction sides coinciding with said pressure and suction sidewalls; a continuous squealer tip rail extending radially outwardly from and substantially continuously around said blade tip surface forming a radially outwardly open squealer pocket; said squealer tip rail including an aft portion extending chordally between said leading edge and said trailing edge adjacent said trailing edge; and at least one film cooling hole in fluid communication with a cooling fluid circuit within said airfoil, said at least one film cooling hole comprising a shaped hole defined by diverging walls, extending in a downstream direction of cooling fluid flow, to form a film sub-boundary layer along said squealer tip rail surface at said suction side, wherein said at least one film cooling hole is located in at least a portion of said squealer tip rail and said diverging walls including at least a portion of said squealer tip rail. - View Dependent Claims (18, 19, 20)
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Specification