| 摘要 |
For reducing wind turbine tip vortices, each blade tip comprises two or more vanes 3,6 or winglets separated by a gap 7 through which flow that would have formed a vortex core is passed from the upwind to the downwind blade sides. The trailing vane trailing edge is close to the main blade trailing edge. The pressure of fluid passing through the gap falls to the downwind side pressure so flow is ejected in a direction opposite that of blade motion to suppress rapidly revolving vortex core formation. A shroud 10 may cover two vane tips to prevent the formation of secondary vortices. The vane stagger at their roots is greater than that of the main foil and reduces along the length of the vane. The leading vane may be tilted towards the suction surface and the same length or shorter than the trailing vane which may tilt towards the pressure surface.
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