Giromill Darrieus Wind Turbines
Giromill Darrieus Wind Turbines
What is a Giromill wind turbine - Darrieus (VAWT)wind | education
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.
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.
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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