| 摘要 |
A wind turbine blade mounted to a hub of a wind turbine includes an airfoil portion disposed between a blade tip portion and a blade root portion configured to be connectable to the hub. The airfoil portion includes a leading edge which sweeps back from a blade axis direction at least in a sweepback region disposed on a blade tip portion side, and an angle A [degree] between the blade axis direction and a tangent line of the leading edge satisfies a relationship of A ‰¥ 250 x r/R -225 in a range of 0.9 ‰¤ r/R ‰¤ 1 in the blade axis direction. R is a distance from a rotational center of the hub to the blade tip portion in the blade axis direction, and r is a distance from the rotational center of the hub to a certain point on the leading edge in the blade axis direction. |
