| 摘要 |
A floating, semi-submerged, tethered device that supports a horizontal axis turbine and power generation equipment for extracting kinetic energy from a tidal stream or ocean current. A submerged body ( 1 ) is supported by surface piercing struts ( 2 ) of small water plane area (FIG. 6 ). The device is tethered to the seabed by a spread of mooring lines ( 12 ) that are deployed both into and away from the direction of the tidal current. A horizontal axis turbine ( 4 ) harnesses energy from the water flow and drives a generator housed within the body. A horizontal strut hydrofoil ( 24 ) corrects the trim of the device when subject to varying loads from the mooring system and can also be used to dampen pitch motion. Rudder flaps in the struts ( 25 ) can be used to counteract roll motion. Power is exported from the device to the seabed by an umbilical ( 17 ). A thrusters ( 22 ) can be used to constrain the rotation of the device about its mooring system to prevent excessive twist building up between the mooring lines and the power export umbilical.
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