Steam turbine rotating blade for a low pressure section of a steam turbine engine
AssigneeGeneral Electric Company
InventorsMuhammad Saqib Riaz, Dimitrios Stathopoulos
Life of this patent
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Abstract
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 skewed 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. A part span shroud is attached at an intermediate section of the airfoil portion between the ends thereof. The blade includes an exit annulus area of about 47.7 ft2 (4.43 m2) or greater.
Claims19
A steam turbine rotating blade, comprising:
- an airfoil portion;
- a root section attached to one end of the airfoil portion;
- a dovetail section projecting from the root section, wherein the dovetail section comprises a skewed axial entry dovetail, wherein the skewed axial entry dovetail comprises about a 19 degree skew angle;
- a tip section attached to the airfoil portion at an end opposite from the root section;
- a cover integrally formed as part of the tip section;
- a part span shroud attached at an intermediate section of the airfoil portion between the ends thereof;
- and
- wherein the blade comprises an exit annulus area of about 47.7 ft2 (4.43 m2) or more.
A low pressure turbine section of a steam turbine, comprising:
- a plurality of latter stage steam turbine blades arranged about a turbine rotor wheel, wherein each of the plurality of latter stage steam turbine blades comprises:
- an airfoil portion having a length of about 26.8 inches (68.1 centimeters) or greater;
- a root section attached to one end of the airfoil portion;
- a dovetail section projecting from the root section, wherein the dovetail section comprises a skewed axial entry dovetail, wherein the skewed axial entry dovetail comprises about a 19 degree skew angle;
- a tip section attached to the airfoil at an end opposite from the root section;
- a cover integrally formed as part of the tip section;
- a part span shroud attached at an intermediate section of the airfoil portion between the ends thereof;
- and
- wherein the plurality of latter stage steam turbine blades comprises an exit annulus area of about 47.7 ft2 (4.43 m2) or greater.
Dependencies are inferred from the claim text.