| 摘要 |
PURPOSE: A concave half-disk shaped vertical shaft wind turbine blade is provided to obtain rotational force by using drag, and to improve rotational efficiency by minimizing the rotational resistance via a ventilation groove. CONSTITUTION: Concave half-disk shaped turbine blades(11,12) are combined to a rotating shaft(15) via a connecting bar. When the wind force is applied to the turbine blades, the ratio of the drag applied to the first turbine blade to the drag applied to the second turbine blade is the same as the ratio of the drag coefficients of the front faces of the turbine blades. Thus, rotational torque is generated, and the turbine blades rotate clockwise. When the face to which a wind is applied is vertical to the direction of the wind, the drag of the first turbine blade is maximized. When the face to which a wind is applied is parallel to the direction of the wind, the drag of another first turbine blade(13) is minimized. Therefore, rotational force is generated continuously. A ventilation groove on the turbine blade reduces the rotational resistance. |
