Wind energy is a kind of kinetic energy generated by air flow. Among the clean energy sources developed by mankind at present, wind energy is the green energy source with the smallest impact on the environment within the presently known scope, and it is a kind of renewable and clean energy source with large reserves and wide distribution. In recent years, the world is actively developing the use of renewable energy, wind power generation has made rapid development. This Yinji net editorial for you to introduce the wind turbine blade length, wind turbine blade weight, how high the wind power pole.

Wind turbine blade length
Depends on the design power of the whole unit, and wind field conditions. The same wind field, the greater the power the longer the blade. For the same power, wind farms with lower average annual wind speeds require longer blades. In fact, according to the research, different wind farms, need to be matched with the corresponding power of the wind turbine, in order to realize the real cost-effective. In addition: the same length of blade, due to the wing type difference, power is not the same. Therefore, blade manufacturers try to optimize the blade structure as much as possible. In fact, the determination of the specific shape of the really good blades is a very complex process, on the fluid dynamics, aerodynamics is very high.

In 1990, the rotor diameter was 25 m; in 2010, it was already 120 m. In 2011, Kaj Lindvig predicted that the impeller diameter of offshore wind turbines would reach 135 m in 2015 and 160 m in 2020, but this prediction was soon exceeded by the American Superconductor Corp. Superconductor Corp.'s 10 MW offshore wind turbine, which went on sale in 2016, already has an impeller diameter of 190 m. To date, the world's largest known blade is 88 meters long and is manufactured in a factory in Denmark.

Weight of wind turbine blades
Wind turbine blade development in the early stage, due to the blade is small, there are wood blade, cloth skin blade, steel beam fiberglass skin blade, aluminum alloy blade and so on, with the blade to the direction of large-scale development, composite materials gradually replace other materials almost become the only choice of materials for large-scale blade. Glass fiber reinforced plastic (FRP) is the most commonly used composite material for modern fan blades, FRP with its low price, excellent performance occupies the dominant position of large fan blade materials. But with the blade gradually become bigger, the wind turbine diameter has exceeded 120m, the longest blade has done 61.5m, blade weight up to 18t. This puts forward more demanding requirements on the strength and stiffness of the material. All glass fiber reinforced plastic blade has been unable to meet the blade large-scale, lightweight requirements. Carbon fiber or other high-strength fibers are subsequently applied to the blade local area.

How high is the wind power pole
The height of the wind turbine will be affected by various factors.
(1) on the capture of the wind alone: because in the same place at the same time, (the fan is in the troposphere at the bottom of the atmosphere) away from the ground surface friction is smaller, air mobility is better, that is, the higher the wind speed is greater. The higher the wind catching ability is stronger. So theoretically, the higher the better.

(2) In fact, to consider the tower height increased production costs and power generation and other factors, the general diameter of the wind turbine and tower height is about the same, that is, the tower is twice as long as the single blade. For example: the early use of vestasv52 (850KW) unit, the wind turbine diameter of 52 meters, a lot of areas in the country using the 55-meter-high tower of the current V80 (2MW) unit, the wind turbine diameter of 80 meters, a lot of areas using the 78-meter-high tower V90 (3MW) unit, the wind turbine diameter of 90 meters, more than 90-meter-high tower.

(3) Even if the same unit, located in different locations, different annual average wind conditions under the tower used height is different: such as the intertidal zone (flat terrain and sea breeze wind conditions are better), the top of the mountain (the installation location has been higher), the valley wind mouth (wind conditions are better) do not need to lift the unit very high. And some areas such as grasslands, next door, although open, single-year average wind speed is not very high, different heights at the wind speed at the wind speed there is a significant difference in the overall economic benefits of reasonable try to use a higher tower.