General Electric Company

Steven Michael DeLessio

Alan Richard DeMania

A dovetail for a steam turbine rotating blade and rotor wheel is provided. The dovetail design comprises a rotating blade curved axial entry dovetail having a four hook profile and a rotor wheel dovetail slot sized to receive the blade dovetail. The blade dovetail and wheel dovetail slot each comprise a plurality of slanted crush surfaces, a plurality of non-contact surfaces, and a plurality of necks that each provide a transition between a slanted crush surface to a non-contact surface. Each neck comprises a slant angle defined by the transition of the slanted crush surface to the non-contact surface. The slant angle ranges from about 60 degrees to about 82 degrees.

Dovetail for steam turbine rotating blade and rotor wheel

A steam turbine rotating blade for a low pressure section of a steam turbine engine is disclosed. The steam turbine rotating blade includes an airfoil portion. A root section is attached to one end of the airfoil portion. A dovetail section projects from the root section, wherein the dovetail section includes a straight axial entry dovetail. A tip section is attached to the airfoil portion at an end opposite from the root section. A cover is integrally formed as part of the tip section. The cover has a first portion that overhangs a pressure side of the airfoil portion and a second portion that overhangs a suction side of the airfoil portion. The cover is positioned at an angle relative to the tip section, wherein the angle ranges from about 15 degrees to about 35 degrees.

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Madison, AL, United States of America

Steven Michael DeLessio