| 摘要 |
PROBLEM TO BE SOLVED: To provide a blade and a shaft joint part for reducing stress in an attachment region.SOLUTION: A fir-tree-shaped root part has at least two passages (31, 32, 33) extending in a blade height direction, each of these passages has passage length (l1, l2, l3) to be measured in a vertical direction, the root part further has webs (34, 35) inserted between each pair of adjacent passages, and at least one web has web length to be measured in the vertical direction, respectively. For each web, local ratio of web to passage between web length and the passage length of each of the two adjacent passages is selected to be 0.5 or more and 0.85 or less at a position where at least root part width becomes the minimum force support root part width in a force support division of the fir-tree-shaped root part.SELECTED DRAWING: Figure 3 |
