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

Claim 0:
1. 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.