Airfoil shape for a turbine bucket and turbine incorporating...

Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Radial flow devices

Reexamination Certificate

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C416S191000, C416SDIG004

Reexamination Certificate

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07988420

ABSTRACT:
Third stage turbine buckets have airfoil profiles substantially in accordance with Cartesian coordinate values of X, Y and Z′ set forth Table I wherein X and Y values are in inches and the Z′ values are non-dimensional values from 0 to 1 convertible to Z distances in inches by multiplying the Z′ values by the height of the airfoil in inches. The X and Y values are distances which, when connected by smooth continuing arcs, define airfoil profile sections at each distance Z. The profile sections at each distance Z are joined smoothly to one another to form a complete airfoil shape. The X, Y and Z distances may be scalable as a function of the same constant or number to provide a scaled up or scaled down airfoil section for the bucket. The nominal airfoil given by the X, Y and Z distances lies within an envelope of +/−.0.040 inches in directions normal to the surface of the airfoil.

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U.S. Application of Chiurato et al. U.S. Appl. No. 11/892,355, filed Aug. 22, 2007.

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