WIND TURBINE BLADE, WIND POWER GENERATING DEVICE COMPRISING SAME, AND WIND TURBINE BLADE DESIGN METHOD

摘要

A blade back shape from a maximum blade thickness position (3) toward a rear edge (4) is defined so that when a distance from a front edge along a blade chord line is represented by X and a distance from the blade chord line to a blade back side is represented by Y, the blade back shape includes a first region (11) that extends from the maximum blade thickness position (3) toward the rear edge (4) on the blade back side with dY/dX as a primary derivative amount of Y to X decreasing by a first amount of change, a second region (12) that is located on a side of the rear edge (4) of the first region (11) and extends toward the rear edge (4) with dY/dX having a second amount of change smaller than the first amount of change, and a third region (13) that is located on the side of the rear edge (4) of the second region (12) and is connected to the rear edge (4) with dY/dX decreasing by a third amount of change larger than the second amount of change.