The wind turbine blade length varies depending on different wind turbines and design conditions, and is determined by the following parameters:
1. Rated power of the generator (Kw),
2. Rated wind speed (m/s),
3. Rated speed of impeller (rpm)
4. Wind turbine efficiency (Cp value),
5. Impeller design tip speed ratio (lambda),
6. Select the aerodynamic performance of the airfoil,
7. Air density (Kg/m3),
8. Altitude(m),
Here are some common wind turbine blade length:
1. Small wind turbine blade length (below 1kw-100kW).
The blade length is usually 1.5-10.0 meters, suitable for households or small facilities.
2. Medium sized wind turbine blade length (100kW-1MW or above).
The blade length is usually 10-27 meters,
3. Large wind turbine blade length (above 1MW).
The blade length is generally between 27-90 meters.
In recent years, the blade length has rapidly exceeded the hundred meter level, with some models reaching over 160 meters.
For example, the world's longer wind turbine blade length is 153 meters, which is used in 26 megawatt offshore wind turbines. This length has broken the global record for wind turbine blade length, surpassing the previous length of 147 meters.
This 26 MW offshore wind turbine is currently larger single unit capacity and longer impeller diameter domestically produced offshore wind turbine in the world. Its hub center height reaches 185 meters, and the wind turbine sweeping area is equivalent to 10.5 standard football fields. One such unit can generate 100 million kilowatt hours of electricity per year, meeting the annual electricity needs of over 55000 households.
The increase in wind turbine blade length has raised higher requirements for material performance. The 153 meter blades adopt a hollow structure, with the main beam made of black high-strength carbon fiber and the main body made of green high-performance glass fiber. This combination enables the wind turbine blades to be made longer and more sturdy.
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