Curiosities, construction and design of wind turbine blades
How do wind turbines work?
Wind turbines blades produce electricity by harnessing the natural energy of the wind to drive a generator. Wind is a clean, sustainable source of energy that never runs out, and the transformation of its kinetic energy into electrical energy produces no emissions.
Wind turbines blades are the natural evolution of windmills and today are high-tech devices. Most turbines blades generate electricity as soon as the wind reaches a speed of between 3 and 4 meters per second, generate a maximum power of 15 meters per second and are disconnected to prevent damage when there are storms with winds blowing at average speeds of over 25 meters per second during a temporary interval of 10 minutes.
Why are three-bladed wind turbines the most commonly used?
Why do wind turbines blades always face the same direction?
Characteristics of a wind turbine
The rotor (a set of three blades mounted on the hub) turns a slow shaft connected to a gearbox that increases the rotational speed from about 13 to about 1,500 revolutions per minute.
Generation of power
The gearbox, through the fast shaft, transfers its energy to the coupled generator, which produces electricity.
Blade rotation speed
The wind rotates the blades, which start to move at wind speeds of about 3.5 m/s and provide maximum power at about 11 m/s. In very strong winds (25 m/s) the blades are placed in flag and the wind turbine is slowed down to avoid excessive stresses.
Evacuation of the power
The energy generated is conducted inside the tower to the base and, from there, through a subway line to the substation, where its voltage is raised to inject it into the electrical grid and distribute it to the consumption points.
Monitoring of the system
All critical wind turbine blades functions are monitored and supervised from the substation and the control center to detect and resolve any incident.
Other wind turbines FAQ’s and curiosities
Some of the most frequently asked questions around wind turbine blade design and wind farms are the following.