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AssigneeMitsubishi Heavy Industries, Ltd.
InventorsMasaaki Shibata, Toyoaki Furukawa, Yoshiyuki Hayashi, Eiji Kato
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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/δ) of the tooth height h to the thickness δ of the boundary layer developed on the surface of the blade is: h/δ=1.0˜10.0, and the ratio (h/p) of the tooth height h to the pitch p is: h/p=0.5˜5.0.
A wind turbine provided with a nacelle mounted on the top end of a support for horizontal revolution, a rotor having a plurality of blades in front of the nacelle being supported for rotation by the nacelle, rotating force being resulted from the lift effected through the pressure difference arising from the difference between the velocities of air stream on the lower chord surface and upper chord surface of the blades, wherein each of said blades is a one-piece blade made of one kind of metal or the rear end part of the blade is made of another metal, and the trailing edge part of the blade is formed to have dentation along the length of the blade.
Dependencies are inferred from the claim text.