Turbine rotor blade

A turbine rotor blade, comprising:

• a blade effective portion including a leading edge and a trailing edge at a boundary between a suction surface and a pressure surface;
• a suction surface side projecting portion projecting from the suction surface on a leading edge side at a tip of the blade effective portion;
• and
• a pressure surface side projecting portion projecting from the pressure surface on a trailing edge side at the tip of the blade effective portion,
• wherein the suction surface side projecting portion includes:
• a leading edge side end surface on the leading edge side, including a contact surface and a non-contact surface, which contacts with the pressure surface side projecting portion of the adjacent turbine blade on the contact surface during rotation;
• a groove portion formed from the non-contact surface to the trailing edge side, the groove portion penetrating the suction surface side projecting portion in a blade height direction, the groove portion being a tapered depression that narrows in width in the projecting direction toward the trailing edge side;
• and
• a joining member configured to be joined to the groove portion, the joining member being formed of a tapered block member that narrows in width in the projecting direction toward the trailing edge side, the joining member having a shape that fits into the groove portion, the joining member being formed of a material that is better in erosion resistance than a material forming the turbine rotor blade,
• wherein the groove portion is a groove for fitting and joining the joining member and the groove portion is a groove for being filled with the joining member,
• wherein a trailing edge side length of the joining member is equal to a depth of the groove portion,
• wherein the joining member is bounded both radially and axially by the groove portion.