| 摘要 |
PROBLEM TO BE SOLVED: To provide a turbine rotor blade enhancing the detection sensitivity of ultrasonic examination also on the rotor blade having steps. SOLUTION: In the turbine rotor blade, an outer fork 10B lies at the end in the rotation axis direction among a plurality of forks and has the two steps on the cross section in the turbine radial direction, which is targeted for the ultrasonic examination. A blade mounting part 8 is mounted integrally with a blade planting part outside in the radial direction of the rotation axis of the blade planting part. Projection portions 12 project from the outer end faces in the rotation axis direction of the outer fork toward the rotation axis direction, at the ends in the rotation axis direction of the blade mounting part. A height total H, a width total W and a length total L of the fork are set to satisfy relationship 35°≤tan<SP>-1</SP>((L<SP>2</SP>+H<SP>2</SP>)<SP>1/2</SP>÷W)≤55°. COPYRIGHT: (C)2011,JPO&INPIT |
