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Open Wind Lens

par 4ndy

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OWL is a prototyping platform for ducted/cowled Horizontal-Axis Wind Turbines, which can deliver increased efficiency-per-area, blade safety and reduced noise.
http://en.wikipedia.org/wiki/Wind_lens
Starting documentation at: http://opensourceecology.org/wiki/Shrouded_wind_turbine

These types of turbines tend to show an increase in power output of 2-5x for a given blade-swept-area, depending how well the shroud is designed. (See open paper: http://www.mdpi.com/1996-1073/3/4/634 and 2.5m 5kW-rated-each results of this study http://en.wikipedia.org/wiki/File:Windlens1.jpg) A shroud also tends to cut down blade-tip vortices, which are typically the single largest cause of noise and downwind turbulence in wind turbines, since it induces a wind-tunnel-like environment where an almost '2D' flow pattern can form around the blades without spilling around the end as much. (http://en.wikipedia.org/wiki/Wingtip_vortices)
A couple of safety considerations with wind turbines can be improved b

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