31-08-2017, 01:19 PM
Wind energy converts kinetic energy into wind to generate electricity or mechanical energy. This is done using a large wind turbine consisting generally of propellers; the turbine can be connected to a generator to generate electricity, or wind used as mechanical power to perform tasks such as pumping water or grinding grain. As the wind passes the turbines move the blades, which rotates the shaft. Currently there are two different types of wind turbines in use: horizontal axis wind turbines (HAWT) or vertical axis wind turbines (VAWT). HAWT are the most common wind turbines, which show propeller blades or "fan style", and VAWT are often in an "egg whisk" style.
The wind is converted by the blades of the wind turbines. The blades of the wind turbines are designed in two different ways, the type of drag and the type of elevation.
• Drag Type: This blade design uses the force of the wind to push the blades around. These blades have a higher torque than the lifting designs but with a slower rotational speed. Drag type blades were the first designs used to leverage wind energy for activities such as grinding and sawing. As the speed of rotation of the blades is much slower than the type of lift, this design is usually never used to generate energy on a large scale.
• Elevator type: the most modern HAWT uses this design. Both sides of the blade have air blown through it resulting in the air it takes longer to travel through the edges. This creates a lower air pressure at the leading edge of the blade, and a higher air pressure created at the edge of the tail. Due to this pressure difference the blade is pushed and pulled around, creating a higher speed of rotation needed to generate electricity.
The wind is converted by the blades of the wind turbines. The blades of the wind turbines are designed in two different ways, the type of drag and the type of elevation.
• Drag Type: This blade design uses the force of the wind to push the blades around. These blades have a higher torque than the lifting designs but with a slower rotational speed. Drag type blades were the first designs used to leverage wind energy for activities such as grinding and sawing. As the speed of rotation of the blades is much slower than the type of lift, this design is usually never used to generate energy on a large scale.
• Elevator type: the most modern HAWT uses this design. Both sides of the blade have air blown through it resulting in the air it takes longer to travel through the edges. This creates a lower air pressure at the leading edge of the blade, and a higher air pressure created at the edge of the tail. Due to this pressure difference the blade is pushed and pulled around, creating a higher speed of rotation needed to generate electricity.