The larger the blades are, the greater the mass will be. When the wind is low, the blades may not be pushed. When the blades are large, the wind-receiving surface will be more powerful and may cause the motor to burn out. Moreover, the voltage changes between the minimum and maximum, which is extremely unstable. The size of the blades should be determined based on the average of the normal maximum and minimum wind speeds in your area to make their rotation more stable. Hope this helps.
Why do wind turbines have two blades instead of three or four or more? Isn’t this more convenient...
Not necessarily, the power of the wind turbine is equal to The product of torque and angular velocity, so a large torque does not necessarily have a large output power.
The most typical example is the Dutch windmill and the now common three-blade wind turbine. If the two are the same size, under certain wind speed conditions, the Dutch windmill has a much larger torque, but the rotation speed is very slow, so it does not It cannot be used for power generation
1. The larger the area, the greater the resistance, and it is easily destroyed when a hurricane occurs. And the greater the resistance, the higher the energy loss.
2. The blade is one of the highest costs in the entire windmill, which can save costs.
3. Based on the blade length of 34 meters, when the wind is strong, the blade tip speed exceeds the speed of sound, causing some special air waves. I am not an expert so I cannot explain it more clearly.
4. It seems that the 120-degree angle is also good for stress.