| 摘要 |
A wind turbine is provided that comprises an axis 3 intended for vertical mounting and plural aerofoils 2 arranged around the axis (3). Each aerofoil (2) is of substantially straight section lengthwise and arranged so that the aerofoil snakes a non-zero angle to a plane in which the axis 3 lies. The angle may be between 10 and 80 degrees or between 30 and 60 degrees. The aerofoils may be mounted on equal length arms 4, perpendicular to the axis, with one arm leading the other when the turbine rotates, and the aerofoil can rotate chord-wise about an axis along its length about its aerodynamic centre. The turbine can be mounted inside an augmenter cage (figs 2-5, 8) that augments the flow of air. The cage can be mounted directly above a supporting surface, by a supporting structure allowing free flow of air, comprising pillars (fig 3, 12). The supporting structure can be a building (fig 2), the surface of which can be shaped to augment the flow of air; or a tower (fig 4) comprising a ring beam (fig 4, 16) and concrete legs (fig 4, 18). The augmenter cage and support structure can be stacked one above another (fig 5). Swept, inclined rotor blades allow smooth running without pulsating torque and reduce aerodynamic noise. |
