| 摘要 |
On a blade for wind power generation that has a lightning receptor, an object is to prevent lightning from striking a boundary between the blade and the lightning receptor as much as possible. The blade 3 for wind power generation includes a lightning receptor 31 configured to form a part of the surface of the blade 3, and a lightning receiving protrusion 4 that protrudes outward from the surface of the lightning receptor. The lightning receiving protrusion 4 is provided to a surface boundary 32 between the blade 30 and the lightning receptor 31. The surface boundary 32a configured to protect against the lightning is positioned within a radius of a circle 5, which is centered on a tip of the lightning receiving protrusion 4 and which has a radius of twice the length of the lightning receiving protrusion 4. A point where electric field concentration on the surface of the lightning receptor is greatest is moved from the boundary to the tip of the lightning receiving protrusion, so as to significantly reduce a possibility of blade damage associated with lightning striking the boundary when being stroke by the lightning. |
