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Tip ramp turbine blade

  • US 8,512,003 B2
  • Filed: 08/21/2006
  • Issued: 08/20/2013
  • Est. Priority Date: 08/21/2006
  • Status: Active Grant
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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