| 摘要 |
A tidal flow turbine system comprises a turbine having blades 123 which have blade tips 124 curved towards the direction of fluid flow. At excessive flow speeds, the coning angle of the blades is increased by actuator 29. The blade tip 124 operates at a reduced coning angle compared to a straight blade, which may reduce drag whilst maintaining power. The blades may be straight for the inner two-thirds of their length 123. The curved portion 124 may have a parabolic e.g. cubic curvature. |
