Giromill Darrieus Wind Turbines
Giromill Darrieus Wind Turbines
What is a Giromill wind turbine - Darrieus (VAWT)
wind | educationA
Giromill is a
Darrieus type
vertical axis wind turbine (VAWT) generator. Unlike the more common
Savonius VAWT, the
Giromill wind turbine uses
lift forces generated by vertical
aerofoils to convert wind energy into rotational mechanical energy.
The
giromill was included in Darrieus's 1927 patent for vertical aerofoil powered vertical axis wind turbines, however development is now starting again on new giromills which take advantage of modern ultra strong light materials to produce turbine blades robust enough to cope with the stresses they are put under.
The giromill is typically powered by two or three vertical
aerofoils attached to the central mast by horizontal supports. While it is cheaper and easier to build than a standard Darrieus turbine, it is less efficient, also requires strong winds (or a motor) to start, and can sometimes struggle to maintain a steady rate of rotation. However, they work well in turbulent wind conditions and are an affordable option where a standard horizontal axis
windmill type turbine is unsuitable.
Buy a Giromill Wind Turbine
This Italian made
500 Watt 24 Volt giromill is available for sale through eBay for around £800.
The Cycloturbine
A variant of the Giromill is the
Cycloturbine (pictured above) which uses a vane to mechanically orient the pitch of the blades for maximum efficiency. This gives the cycloturbine the advantage over other Darrieus wind turbines of
self-starting. In low winds the blades are pitched flat against the wind generating
drag forces and starting the turbine turning. As the rotational speed increases the blades are pitched so that the wind flows across the aerofoils generating
lift forces and accelerating the turbine.
Article Last Modified: 16:27, 30th Jan 2007
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