Caption: Left to right: An upwind HAWT, the most common turbine design; a downwind HAWT, an unusual but effective design; and two common VAWT
Wind turbine can be classified into two types; horizontal axis wind turbine (HAWT) and vertical axis wind turbine (VAWT
Roscher  optimized the structural design of a VAWT
rotor blade and to decrease the mass to area ratio by varying blade shape and structural layout.
A new counter rotating (CR) VAWT
concept was developed at COMOTI.
Performance of VAWT
at various source wind directions.
The good news is that several VAWT
models have pending applications, showing promise that the technology is edging forward.
Upon the invention of the far more efficient and inexpensive three-bladed, lift-based Horizontal Axis Wind Turbine, VAWTs
faded into history, though working examples still exist in remote parts of Persia (now Iran and Afganistan) and few other parts of the world.
The fully working 50-kW prototype will demonstrate Project NOVA'S new concept 10-MW offshore, double-arm VAWT
. The first machine will be built next year following two years of prototype testing.
The two primary types of wind turbine today in use are horizontal axis (horizontal-axis wind turbine (HAWT)) and vertical axis (vertical-axis wind turbine (VAWT
A modicum of vertical axis wind turbines (VAWT
) are also present in the mix.
Worldwide is known mostly popular horizontal axis power plants (HAWT), but lately vertical axis wind power plants (VAWT
) are becoming more popular, because they have a lot of advantages such as low noise, more environmentally friendly and etc.