TURBINE ROTOR BLADE

摘要

A turbine rotor blade (1) with a cover (3) restricting a twist at a blade tip part (2), wherein a profile part (4) is formed so that at least the centroid of the blade tip part (2) in a blade cross section can be displaced from the radial line (R) of a turbine extending from the centroid of a blade root part (5) in the blade cross section, the tilted direction of a contact surface (Z) between the covers (3, 3) relative to the axis (A) of the turbine is set so that a pressing force can act between the covers (3, 3) adjacent to each other in circumferential direction according to the positional relation of the centroid to the radial line and the rotation direction of the profile part (4), whereby even when the length of the blade is rather short, an assembly operation can be facilitated and a local stress concentration can be suppressed by sufficiently assuring a connection force between the covers at the time of rotation to increase a reliability.