| 摘要 |
A vertical axis wind turbine capable of rotating at a high velocity after starting to rotate while keeping its self-startability high in starting to rotate is provided. The vertical axis wind turbine 10 has airfoil blades with cutouts 19 in the airfoil-shaped lower surfaces of the blades and boundary-layer reattachment portions in a convex shape projecting outward from the maximum cutout depth points in the cutouts 19 toward the trailing edge sides of the blades 18 . For example, the maximum depth h of the cutout 19 is determined to 0.2t<=h<=0.7t relative to the maximum thickness of the blade t in the blade section, and the boundary-layer reattachment portion 19 a is formed in a convex shape projecting outward from the maximum cutout depth point h in the cutout toward the trailing edge side of the blade 18 . It is desirable to form the cutout having a cutout starting point at the position of 0.45C to 0.7C from the leading edge of the blade 18 having a blade chord length C and a cutout end point at the position of 0.15C to 0.35C from the trailing edge of the blade 18.
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