Vertical Turbine Generator
5 March 2012
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Vertical Turbine Generators (VAWTs) are a type of wind turbine generator that has the primary rotor shaft aligned in a vertical position. Using a vertical axis, both gearbox and generator can be situated at the ground; towers are not needed any more for mounting and are easy for maintenance. Drag might be produced when the blades oscillates into the wind.
Subtypes of Vertical Turbine Generators
- Darrieus wind generator – (Egg beater model) has good proficiency but is unreliable due to huge amount of torque surge and cyclic stress it produces on each tower. Also requires external power to start up.
- Giromill – a variation of the Darrieus turbine; it has straight blades, rather than curved ones. This model produces variable pitch which creates less torque throb and is self-out setting. The upper hand of variable pitch is: dynamic operation in fierce winds, high starting torque, less blade velocity proportion, high coefficient of performance. Straight V blades or curved ones can be used.
- Savonius wind generator – drag type model with two or numerous scoops that are serviced in anemometers. The turbine is self out-setting whenever there are three or more scoops. Sometimes, elongated helical scoops give the turbine smooth torque.
Advantages of VAWT
- The turbine designed to be used at ground level and uses less towers; more accessible of maintenance.
- Can be built on locations where towering buildings are not allowed and be in favor of hilltops, mesas and ridgelines.
- VAWT has decreased sound signature compared to other type of turbine.
- VAWT has lower start-up speed.
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