| 摘要 |
A system is adapted to extract energy from flowing liquid. The system inc ludes at least one vertically-extending vane adapted to move in response to the flowing liquid. The vane has a vertical length wherein at least a portio n of the vane can be positioned below a surface of a body of liquid such tha t the vane forms a swept area defined at least partially by the vertical por tion of vertical lengths of the vane positioned below the surface. The syste m further includes a mechanism adapted to selectively vary the swept area.</ SDOAB> |
