| 摘要 |
The blade structure of a wind turbine is provided which has enough strength for sporadic large load and increased durability. The blade can be formed into a thinner blade profile, with which blade performance is improved, increased efficiency of the wind turbine is attainable, and the noise induced by Karman vortex street is reduced. The blade is made of metal and formed into a one-piece blade or a split-type blade consisting of a main blade body made of metal and a rear end member made of metal other than that of said main blade body, the rear end member being fixed to the rear end of said main blade body, dentation being formed in the trailing edge part of the blade along the length thereof, the dentation being shaped in a serration of triangular tooth, of trapezoid tooth, or of sawtooth, the ratio(h/´) of the tooth height h to the thickness ´ of the boundary layer developed on the surface of the blade is: h/´ = 1.0 ˆ¼ 10.0, and the ratio (h/p) of the tooth height h to the pitch p is: h/p = 0.5 ˆ¼ 5.0.
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