From 65m to 88m. A wind turbine is an electrical machine that does not require fuel and uses wind as energy. From the perspective of mechanical stress, wind shear, cabin yaw, rotational inertia and other factors will cause the two-blade wind turbine to bear larger dynamic loads. including 3 blade fan is like a plate, while the 2 blade fan rotor is more like a stick. The plate is balanced relative to the stick as it rotates.
What is the surface area of a wind turbine blade?
The reason why it is thin is to respect the principle of aerodynamics. But it's really not small, some leaves are fifty or sixty meters long. Large and multiple blades are suitable for wind turbines with low wind speed and low rotation speed, and their efficiency is low. Wind turbines mainly use low ratio wind turbinesstrength with few blades and narrow blades, which can operate with higher efficiency and high speed.
Generally, the height of wind turbines in China is around 65 meters. Blades are the main components of wind power generation. The larger the area swept and the lighter their weight, the more physical electrical energy is generated. In this way, electricity produced More and more.
The larger the surface area of the blade, the greater the strength and it is easy to destroy in a hurricane. And the greater the resistance, the greater the energy loss. The blades are one of the most expensive parts of the entire windmill, which can help keep costs down. Assuming that the length of the blade is 34 meters, when the wind is strong, the speed of the blade tip exceeds the speed of sound, causing special air waves.
Why wind turbines havetwo blades instead of three or four or more? Isn't it more convenient...
The wind energy utilization coefficient of the wind turbine is expressed by CP, in theory, the CP will not exceed 0.593. The maximum power generation efficiency of current traditional wind turbines (the highest utilization rate is about 10 meters/second) is generally about 0.45, while the seventh-level wind is 14 at 17 meters. /second, which goes beyond the problems of wind turbines. Wind speed, utilization rate will start to decrease, around 0.2 to 0.4. The sweeping area is related to the diameter of the wheel. The current diameters of the main wheel are 70, 80, 93, 105, 115 meters, etc. You can calculate the corresponding scanning area.
In addition, the current power of main wind turbines is 1500, 2000, 3000, 5000, 6000 kW, etc., of which 1500 and 2000 account for 80%.
1. The larger the area, the moreThe strength is great and it is easy to be destroyed in a hurricane. And the greater the resistance, the greater the energy loss.
2. The blade is one of the highest costs of the entire wind turbine, which can reduce costs.
3. Based on a blade length of 34 meters, when the wind is strong, the speed of the blade tip exceeds the speed of sound, causing special air waves. I'm not an expert, so I can't explain it. more clearly.
4. It seems that the 120 degree angle is also good for stress.