Vertical Axis Wind Turbine
Vertical axis wind turbine, shortly referred has a vertically set main rotor shaft. The base of the wind turbine is where the main components are present. In this turbine, the gearboxes and generators can be located close to the ground making it easier to repair and do service to these components. These turbines need not be pointed towards the wind. During the early period the design of this turbine had the torque, which was generated during the blade's huge bending moments and each revolution, but this was considered a major drawback. Later this problem was solved by using a new design that had the helical twist of blades.
Forms of Vertical Axis Wind Turbine
Lift-based VAWT - Operates at greater tip speed ratios as an example, Cycloturbines and Durries rotors
Drag-type VAWT - Operates at a relatively lower tip speed ratios for example, Savories rotors
Recently a distinctive sort of VAWT has been developed. This is a distinctive mix of both the Savories and Durries VAWTs. This has been developed in an effort to enhance the efficiency at a lower p.m. and lower wind speed. Silent turbine is definitely the output of higher wind speeds and is appropriate for residential purposes.
Vertical Axis Wind Turbine - Advantages
Much more quantity of turbines might be set up in any offered space of wind farms as they're able to be crammed closer with each other when compared to the horizontal axis wind turbines that call for extra spacing (ten times their width).
Wind farms set up with VAWTs can produce power output ten times more than the horizontal axis wind turbines used in the wind farm of the same size.
The VAWTs do not generate lot of stress on the structure that supports it. They are also quiet, rugged and Omni-directional. They can be placed close to ground, as they do not need heavy wind for the power generation. The feature of being close to ground provides the advantage of easy maintenance and easy installation on chimneys and similar structures.
Vertical Axis Wind Turbine - Disadvantages
The VAWTs have low dynamic stability and starting torque problems and also will easily stop when the wind blows very hard
These turbines are really sensitive to situations linked to off-design. They could be operated only in environments with lower wind speed, as they have to be installed at lower heights.
The central axis is where the blade spins around and hence can easily become weak, which causes the blades to crack, flex and break leading to terrible failure. Due to this drawback, this turbine is considered less reliable than the HAWTs (Horizontal axis wind turbines).
