Wind energy - Types of wind turbines
Renewable energy tutorial
Wind power - Types of wind turbines
There are two main classifications of wind turbines -
- Horizontal Axis Wind Turbines (HAWT)
- Vertical Axis Wind Turbines (VAWT)
Let's discuss these two types of wind turbines in a little detail.
Horizontal axis wind turbines
These are turbines looking like windmills with the top of the tree pointing upwards. direction of the wind. Since they must be oriented towards the wind, the small turbines are directed by vanes mounted on the structure. The larger turbines have wind sensors with servo to turn the turbines.
They are also fitted with gearboxes to accelerate the slow rotation to make it strong enough for the generator turbines. The blades are stiff enough to avoid breaking or sagging.bend due to the wind's torque.
This guy is mounted on a tower; therefore, they experience high speed winds. They are slightly bent to reduce the sweep area. A lower sweep area reduces drag, which can lead to fatigue and breakdown.
Vertical axis wind turbines
The main root is mounted on the vertical tree. This eliminates the difficulties associated with horizontal wind turbines. Sub-types include -
Darius Wind Turbine
This is also known as Egg Threshing Turbine and looks like a huge egg beater. It is efficient but can have more downtime and therefore less reliable. To improve strength (blade surface to rotor surface) three or more blades should be used.
Savonious Wind Turbine
These types have a higher reliability than the turbines Darius. The problem is, they can't be mounted on towers. Hence, they are exposed to turbulent and irregular model victories. As these are drag type turbines, they are less efficient than HAWTs. The advantage is that they are able to withstand extreme turbulence.
Most VAWTs cannot start automatically and require external power to shake them. For optimum performance, VAWTs should be mounted on roofs. The roof channels the wind into the blades.