| 摘要 |
PROBLEM TO BE SOLVED: To enable a shape of blade to catch whatever fine wind blows by paying attention to a rear side, i.e. a back side of a blade that is usually hidden against attention of a person although a shape of blade that is a key for a wind turbine for a vertical shaft type wind power generator has a different outer shape and size in response to an output of a wind power generator.SOLUTION: Vertical upright blades 1 are installed at outer ends of a plurality of horizontal arms (struts) radially fixed to a vertical center shaft 6. A horizontal sectional shape of this blade has an outer shape of "cut U-shape". A rear half part of its streamline shape in contrast with a front half part has a protruded arc at its outer surface, a plane of the center shaft side is kept open in a "cut U-shape", so that wind is effectively caught at the back part of the blade and the blade is pushed. In addition, when the wind turbine is rotated while being pushed by wind at the back side, it gradually receives wind power from lateral side. However, other blades are pushed in an advancing direction with the wind power struck against the "cut U-shape" part, so that it may act as a power for rotating the wind turbine. A similar action may also occur in the case that the "cut U-shape" opening is closed to become a recessed arc plane. |
