Patent ID: 11959394
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 14:
15. 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.