Wind Energy Wind Turbine Types - Renewable Energy

What are the types of Wind Turbines?

Wind turbines are basically classified into two types. They are -

  • Horizontal Axis Wind Turbines (HAWT)
  • Vertical Axis Wind Turbines (VAWT)

Horizontal Axis Wind Turbines

Horizontal Axis

The top of the shaft is pointed towards the direction of the wind and they are similar to that of windmill turbines. Wind vanes direct the small turbines which are mounted on the structure, as the turbines are pointed towards the direction of the wind. Large turbines are turned by the wind sensors.

For the generator turbines, the slow rotation is accelerated and is made strong enough by fitting gear-boxes. Any breakages or bends are avoided by the stiff blades by moving in the direction of the wind.

High velocity winds are advocated by this type of wind turbine as they are mounted high on a tower. The sweep area is reduced by bending slightly. The resistance is reduced by the lower sweep area.

Vertical Axis Wind Turbines

Vertical Axis

The drawbacks associated with the Horizontal Axis Wind turbines are eliminated by the Vertical Axis wind turbines as the main root is being mounted on the vertical shaft. Vertical Axis wind turbines are sub divided into -

Darius Wind Turbine

Darius wind turbines are similar to the structure of egg beater and hence are known as egg-beater turbines. This type of turbines is less reliable as the occurrence of down times is more, apart from this, it is considered as an efficient type of turbine. More than three blades need to be used in order to develop the solidity feature.

Savonious Wind Turbine

When compared to that of Darius turbines, this type of Savonious wind turbines are more reliable, but it is not possible to mount these turbines on the top of the towers. Hence irregular and turbulent wind patterns affect these types of wind turbines. The core benefit of this type of turbine is that it has the capacity to withstand the extreme turbulence but they are considered as less efficient when compared to HAWT.

To provide a jolt, an external energy is required as VAWT cannot get started itself. These turbines are usually mounted on roof-tops for getting the maximum out of the turbines. The wind is passed into the blades by the roof.

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