WIND TURBINE, WIND POWER GENERATION DEVICE PROVIDED THEREWITH, AND WIND TURBINE DESIGN METHOD

摘要

Provided is a wind turbine blade that delivers the desired aerodynamic characteristics under conditions where the upper limit of the chord length near the blade root is limited. The wind turbine blade includes a blade body (3) whose chord length increases from a blade tip (1b) toward a blade root (1a). The blade body (3) includes a blade tip region (1c) located near the blade tip and whose chord length increases gradually toward the blade root (1a), the blade tip region (1c) having a substantially constant first design lift coefficient, a maximum-chord-length position (1d) located near the blade root (1a) and having a maximum chord length, the maximum-chord-length position (1d) having a second design lift coefficient higher than the first design lift coefficient, and a transition region (1e) located between the blade tip region (1c) and the maximum-chord-length position (1d). The transition region (1e) has a design lift coefficient increasing gradually from the first design lift coefficient to the second design lift coefficient in a direction from the blade tip (1b) toward the blade root (1a).