To share a part for generating lift and generating a turbulent flow, and to provide a vertical shaft windmill which has a small number of parts of blade elements and a simple structure, and can be inexpensively manufactured.
A plurality of blade elements is rotatably attached to a vertical shaft 2 at equal interval in a circumferential direction. The blade element 6 is formed by a thin plate, and a center part of the blade element 6 is slightly bent toward the outer side in a diametrical direction over the whole area in the vertical shaft direction in regard to both side parts of the blade element 6 in a rotating direction. At a side part of the blade element 6 in the rotating direction about the vertical shaft 2, a bending portion 9 formed so as to bend toward an outer surface of the blade element over the whole area in the vertical shaft direction is provided. The bending portion 9 has both functions of generating lift and generating a turbulent flow in the upstream of an air flow.
Hideo Sugiyama
Koichi Yuda
Uozumi Takahiro
Naohiko Teshima
Mitsuo Shiraishi
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