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United States Patent Application

View the Complete Application at the US Patent & Trademark Office
Fourth 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 and Y 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 envelop of .+-.0.150 inches in directions normal to the surface of the airfoil.
Hyde, Susan Marie (Piedmont, SC), By, Robert Romany (Simpsonville, SC), Schaeffer, Jon Conrad (Simpsonville, SC), Sims, Calvin Levy (Mauldin, SC), Boisclair, Michael Ernest (Malta, NY)
10/ 621,460
July 18, 2003
[0001] This invention was made with Government support under Contract No. DE-FC21-95MC31176 awarded by the Department of Energy. The Government has certain rights in this invention.