The vertical axis
As already mentioned, they work to exert a resistance to air and within this there are also two groups:
"The drive by air resistance: within these include not need orientation to the wind, are usually used for mechanical work (need slow and force: grinding, pumping and performance ,...) between 10 and 25% of the Betz limit.
Types of wind turbines: Savonius, paddles and bowls.
"The lift operated by air: this we can comment that uses airfoils like the propellers of the aircraft, its performance is above the others, reaching between 35 and 55% of the Betz limit.
The main types that we can find are: Darreius and Giromill.
The horizontal axis
They need to face the wind, its use is fairly widespread and common in the generation of electric energy and its performance levels between 30 and 40% of the Betz limit.
types that we find are very varied: bladed, bladed, three-bladed multiblade, etc ...
As such it is noteworthy that the most used are: multiblade (for pumping) and Three-bladed (electricity generation).
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