| 摘要 |
<p>A rotor element 10 comprises a circular hub portion 12 and a pair of blade segments 14, 16 which are attached to and extend from diametrically opposite positions of the hub portion 12. The blade segments 14, 16 are helical in cross-section, and are curved longitudinally. A number of rotor elements 10 can be stacked on a drive shaft 22 in order to form a vertical axis wind turbine 23. Each of the blade segments 14, 16 is provided with locating means, for example, tongues and slots, which co-operate with the locating means of an adjacent rotor element 10 in the stack. The rotor element may be injection moulded in plastics or cast, for example from aluminium, and adjacent rotor elements in the stack may be bonded together using adhesive and/or welding (ultrasonic welding in the case of plastics). Horizontal or vertical ribs 13,15 may be provided.</p> |
