Tip ramp turbine blade
First Claim
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1. A turbine blade comprising:
- a hollow airfoil, platform, and integral dovetail;
said airfoil including transversely opposite pressure and suction sides extending chordally between opposite leading and trailing edges, and longitudinally in span from root to tip, wherein said pressure side is concave and said suction side is convex and converge together aft toward said trailing edge;
said tip including first and second tip ribs extending outwardly from a tip floor along said pressure and suction sides between said leading and trailing edges to define a tip cavity, and said tip floor enclosing an internal cooling circuit, wherein said first and second tip ribs are integral with said pressure and suction sides, respectively, and bound said tip cavity to converge aft in width to said rib junction; and
an exit ramp bridging said first and second ribs at an aft junction thereof near said trailing edge and rising in elevation aft from said tip floor, wherein said ramp converges aft in width and includes a forward land blending forwardly with said tip floor, an aft land blending with said aft junction of said ribs, and a middle land sloping outwardly from said forward land to said aft land, wherein said forward land is chordally concave, and said aft land is chordally convex.
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Abstract
A turbine blade includes first and second tip ribs extending from a tip floor to define a tip cavity. An exit ramp bridges the ribs and rises in elevation aft from the floor.
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Citations
19 Claims
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1. A turbine blade comprising:
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a hollow airfoil, platform, and integral dovetail; said airfoil including transversely opposite pressure and suction sides extending chordally between opposite leading and trailing edges, and longitudinally in span from root to tip, wherein said pressure side is concave and said suction side is convex and converge together aft toward said trailing edge; said tip including first and second tip ribs extending outwardly from a tip floor along said pressure and suction sides between said leading and trailing edges to define a tip cavity, and said tip floor enclosing an internal cooling circuit, wherein said first and second tip ribs are integral with said pressure and suction sides, respectively, and bound said tip cavity to converge aft in width to said rib junction; and an exit ramp bridging said first and second ribs at an aft junction thereof near said trailing edge and rising in elevation aft from said tip floor, wherein said ramp converges aft in width and includes a forward land blending forwardly with said tip floor, an aft land blending with said aft junction of said ribs, and a middle land sloping outwardly from said forward land to said aft land, wherein said forward land is chordally concave, and said aft land is chordally convex. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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- 8. A hollow turbine blade comprising first and second tip ribs extending outwardly from a tip floor along pressure and suction sides between leading and trailing edges to define a tip cavity therebetween, said tip floor enclosing an internal cooling circuit, and an exit ramp bridging said ribs and rising in elevation aft from said tip floor, wherein said ramp includes a forward land extending forward toward said leading edge and blending with said tip floor, and an aft land extending aft toward said trailing edge and blending with the junction of said ribs, and a middle land sloping outwardly from said forward land to said aft land wherein said forward and aft lands blend differently with said tip floor and rib junction, and wherein said forward land is chordally concave.
Specification