Rotor blade

A rotor blade to be attached to a rotor shaft rotatable about an axis, the rotor blade comprising:

• a blade body extending in a radial direction with respect to the axis and having a blade-shaped cross-section orthogonal to the radial direction;
• a fillet portion provided on a radial outer side of the blade body and having a hollow portion formed therein;
• a shroud provided on a radial outer side of the fillet portion and extending in a circumferential direction;
• and
• a seal fin projecting from the shroud to an outer circumferential side and extending in a direction intersecting the blade body when viewed from the radial direction, wherein a wall thickness on a pressure side of the fillet portion is greater than a wall thickness on a suction side of the fillet portion on a trailing edge side of the blade body as demarcated by an intersection portion between the blade body and the seal fin serving as a boundary, and
• wherein the wall thickness on the pressure side of the fillet portion and the wall thickness on the suction side of the fillet portion are substantially identical at the intersection portion between the blade body and the seal fin.

A rotor blade to be attached to a rotor shaft rotatable about an axis, the rotor blade comprising:

• a blade body extending in a radial direction with respect to the axis and having a blade-shaped cross-section orthogonal to the radial direction;
• a fillet portion provided on a radial outer side of the blade body and having a hollow portion formed therein;
• a shroud provided on a radial outer side of the fillet portion and extending in a circumferential direction;
• and
• a seal fin projecting from the shroud to an outer circumferential side and extending in a direction intersecting the blade body when viewed from the radial direction,
• wherein a height of the hollow portion in the radial direction is at a minimum at an intersection portion between the blade body and the seal fin, and is greater than the height at the intersection portion at at least a part of a leading edge side and a trailing edge side.

A rotor blade to be attached to a rotor shaft rotatable about an axis, the rotor blade comprising:

• a blade body extending in a radial direction with respect to the axis and having a blade-shaped cross-section orthogonal to the radial direction;
• a fillet portion provided on a radial outer side of the blade body and having a hollow portion formed therein;
• a shroud provided on a radial outer side of the fillet portion and extending in a circumferential direction;
• and
• a seal fin projecting from the shroud to an outer circumferential side and extending in a direction intersecting the blade body when viewed from the radial direction,
• wherein a wall thickness on a suction side of the fillet portion is greater than a wall thickness on a pressure side of the fillet portion on a leading edge side of the blade body as demarcated by an intersection portion between the blade body and the seal fin serving as a boundary, and
• a height of the hollow portion in the radial direction is at a minimum at the intersection portion between the blade body and the seal fin, and is greater than the height at the intersection portion at at least a part of the leading edge side and a trailing edge side.

A rotor blade to be attached to a rotor shaft rotatable about an axis, the rotor blade comprising:

• a blade body extending in a radial direction with respect to the axis and having a blade-shaped cross-section orthogonal to the radial direction;
• a fillet portion provided on a radial outer side of the blade body and having a hollow portion formed therein;
• a shroud provided on a radial outer side of the fillet portion and extending in a circumferential direction;
• and
• a seal fin projecting from the shroud to an outer circumferential side and extending in a direction intersecting the blade body when viewed from the radial direction,
• wherein a wall thickness on a pressure side of the fillet portion is greater than a wall thickness on a suction side of the fillet portion on a trailing edge side of the blade body as demarcated by an intersection portion between the blade body and the seal fin serving as a boundary, and
• a height of the hollow portion in the radial direction is at a minimum at the intersection portion between the blade body and the seal fin, and is greater than the height at the intersection portion at at least a part of a leading edge side and the trailing edge side.