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US 11,959,394 B2Granted
Turbine rotor blade
AssigneeMitsubishi Heavy Industries, Ltd.
InventorNorifumi Hirata
Life of this patent
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Abstract
A suction side fillet portion of a turbine rotor blade includes a central fillet portion located at the center of a length of the suction side fillet portion along an extension direction of the suction side fillet portion, an upstream intermediate fillet portion which is located between the central fillet portion and a front edge that is an upstream end of the suction side fillet portion, and in which a fillet height from an upper surface of a platform portion is higher than a fillet height of the central fillet portion, and a downstream intermediate fillet portion which is located between the central fillet portion and a rear edge that is a downstream end of the suction side fillet portion, and in which a fillet height from the upper surface of the platform portion is higher than the fillet height of the central fillet portion.
Claims21
A turbine rotor blade, comprising:
- an airfoil portion having a pressure surface and a suction surface;
- a platform portion formed on a base end side of the airfoil portion;
- a shank portion formed opposite to the airfoil portion across the platform portion;
- and
- at least a suction side fillet portion of a fillet portion formed in a connection between the suction surface and an upper surface of the platform portion,
- wherein the suction side fillet portion includes:
- a central fillet portion which is formed at a position including a center of a length of the suction side fillet portion along an extension direction of the suction side fillet portion;
- an upstream intermediate fillet portion which is located between the central fillet portion and a front edge that is an upstream end of the suction side fillet portion, and in which a fillet height of the upstream intermediate fillet portion from the upper surface of the platform portion is higher than a fillet height of the central fillet portion;
- and
- a downstream intermediate fillet portion which is located between the central fillet portion and a rear edge that is a downstream end of the suction side fillet portion, and in which a fillet height of the downstream intermediate fillet portion from the upper surface of the platform portion is higher than the fillet height of the central fillet portion,
- wherein a ratio of the fillet height to a fillet width in the upstream intermediate fillet portion is lower than a ratio of the fillet height to a fillet width in the central fillet portion, and
- wherein a ratio of the fillet height to a fillet width in the downstream intermediate fillet portion is lower than the ratio of the fillet height to the fillet width in the central fillet portion.
9 more elements
A turbine rotor blade, comprising:
- an airfoil portion having a pressure surface and a suction surface;
- a platform portion formed on a base end side of the airfoil portion;
- a shank portion formed opposite to the airfoil portion across the platform portion;
- and
- at least a suction side fillet portion of a fillet portion formed in a connection between the suction surface and an upper surface of the platform portion,
- wherein the suction side fillet portion includes:
- a central fillet portion which is formed at a position including a center of a length of the suction side fillet portion along an extension direction of the suction side fillet portion;
- an upstream intermediate fillet portion which is located between the central fillet portion and a front edge that is an upstream end of the suction side fillet portion, and in which a fillet height of the upstream intermediate fillet portion from the upper surface of the platform portion is higher than a fillet height of the central fillet portion;
- and
- a downstream intermediate fillet portion which is located between the central fillet portion and a rear edge that is a downstream end of the suction side fillet portion, and in which a fillet height of the downstream intermediate fillet portion from the upper surface of the platform portion is higher than the fillet height of the central fillet portion,
- wherein the central fillet portion of the suction side fillet portion has a first cross section demarcated by:
- a first curved line connecting the suction surface and an end edge of the upper surface of the platform portion;
- a first line segment extending from a position where the first curved line is connected to the suction surface to the upper surface of the platform portion along a blade height direction;
- and
- a second line segment extending from a position where the first line segment is connected to the upper surface of the platform portion to the end edge,
- wherein the first curved line is defined by a part of an ellipse,
- wherein a center of the ellipse is located opposite to the airfoil portion across the end edge of the platform portion in a blade thickness direction, and
- wherein a position of a lower end of the ellipse is located below the end edge of the platform portion in the blade height direction.
15 more elements
A turbine rotor blade, comprising:
- an airfoil portion having a pressure surface and a suction surface;
- a platform portion formed on a base end side of the airfoil portion;
- a shank portion formed opposite to the airfoil portion across the platform portion;
- and
- at least a suction side fillet portion of a fillet portion formed in a connection between the suction surface and an upper surface of the platform portion,
- wherein the suction side fillet portion includes:
- a central fillet portion which is formed at a position including a center of a length of the suction side fillet portion along an extension direction of the suction side fillet portion;
- an upstream intermediate fillet portion which is located between the central fillet portion and a front edge that is an upstream end of the suction side fillet portion, and in which a fillet height of the upstream intermediate fillet portion from the upper surface of the platform portion is higher than a fillet height of the central fillet portion;
- and
- a downstream intermediate fillet portion which is located between the central fillet portion and a rear edge that is a downstream end of the suction side fillet portion, and in which a fillet height of the downstream intermediate fillet portion from the upper surface of the platform portion is higher than the fillet height of the central fillet portion,
- wherein, in the central fillet portion, a lower edge of a curved surface forming an outer surface of the central fillet portion intersects the upper surface of the platform portion with a predetermined inclination without being tangent to the upper surface of the platform portion at an end edge of the platform portion, and
- wherein, in the upstream intermediate fillet portion and the downstream intermediate fillet portion, a lower edge of a curved surface forming an outer surface of each of the upstream intermediate fillet portion and the downstream intermediate fillet portion is tangent to the upper surface of the platform portion.
9 more elements
Dependencies are inferred from the claim text.