| 摘要 |
Blade (1) extending along a geometric axis (1gXY/1gYZ) from a root (111XY/111YZ) where the blade (1) is joined to the rotor (2) to a tip (122XY/122YZ). The blade has in a projection on a side/front plane XY/YZ a side/front root portion (11XY/11YZ) extending from the side/front root (111XY/111YZ) to a first intermediate side/front point (112XY/112YZ); a side/front tip portion (12XY/12YZ) extending from a second intermediate side/front point (121XY/121YZ) to the side/front tip (122XY/122YZ). The side root portion (11XY) forms an acute angle α1 with the axis y in the side root (111XY), 0°≦̸α1≦̸10° and the side tip portion (12XY) forms an acute angle α2 with the axis y in the second intermediate side point (121XY), 0°≦̸α2≦̸10°. The front root portion (11YZ) forms an acute angle &bgr;1 with the front pitch axis (1pYZ) in the front root (111YZ), −10°≦̸&bgr;1≦̸10° and the front tip portion (12YZ) forms an acute angle &bgr;2 with the front pitch axis (1pYZ) in the second intermediate front point (121YZ), 0°≦̸&bgr;2≦̸10°.
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