The reason why wind turbines for wind power generation have three blades;
1. Three blades can improve the wind sweeping efficiency, and the three blades can also maintain the balance of the wind turbine.
2. The number of blades of the wind turbine is 3, which is the optimal result under the overall consideration and action of several factors, mainly optimization and balance between aerodynamic efficiency and structural complexity.
3. The three-part page turner determines low manufacturing and maintenance costs and ease of use.
Why do wind turbines have two blades instead of three or four or more? Isn't that easier...
In order to allow the turbine to be naturally aligned with the direction of the wind, the wind turbine generally uses a direction adjustment device. For large wind turbines, a wind direction monitoring systemdriven by a motor is generally used. The entire yaw system consists of a motor and reduction mechanism, a yaw adjustment system and a twisted cable protection device. The yaw adjustment system includes a wind vane and yaw system adjustment software. The weather vane has a pulse output signal corresponding to each wind direction. Its yaw direction and yaw angle are determined through the yaw system software, then the yaw signal is amplified and transmitted to the motor, and the wind turbine platform rotates. the deceleration mechanism until it is aligned with the wind direction.
No matter where it is built or how strong the wind is, why does the wind turbine always spin slowly?
1. The larger the area, the greater the resistance and it is easy to be destroyed in a hurricane. And the greater the resistance, the greater the energy loss.t important.
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.
There is a reason for this. The old electric fan is made up of three blades.
A few days ago the old electric fan in the house broke down, then I bought a new one. This fan no longer has just three blades like the traditional electric fan, but is made up of many small blades. This design looks much better than a traditional electric fan. At the same time, this also reminds me of another problem, namely the wind turbines usedn wind energy production, without exception, they are made up of three blades. Why is this? You can't create energy from nothing, so wind power doesn't create electricity from nothing, it just converts energy and turns wind energy into electricity. Since it is about energy conversion, it will inevitably involve a problem, namely the conversion efficiency. The wind energy conversion rate is closely related to two factors, one is wind energy and the other is wind speed.
Wind force is equal to wind power multiplied by wind speed.
Now imagine that our wind turbine has many blades that combine to form a closed disk. What about wind energy conversion? Basically zero. Because when the wind turbine becomes a closed disk, it can effectively maximize the wind force acting on the disk, but there is no pace of windIt can pass through the disk, but can only go around the disk, so the wind speed acting on the disk is zero. Any number multiplied by zero is zero, so even if the wind is very strong and there is no wind speed, there is no way to make the conversion. We see that to convert wind energy into electrical energy, the number of blades must be reduced so that the wind can pass quickly. As the number of blades decreases, the wind speed will gradually increase and the wind force acting on them will gradually decrease. In order to achieve maximum conversion power, a balance point must be found.
Now you might think that since a wind turbine has three blades, it must be because the wind is strongest with three blades, but that's not the case.
Calculations show that the wind energy conversion rate of the four blades is the highest. So forwhat do wind turbines have three blades instead of four? When we encounter a problem, if we cannot find the answer in scientific principles, then the answer must be related to another factor, namely money. The fan is not an electric fan. It must withstand a lot of force and bending moment when working, so the material must be hard. The blades of modern large-scale wind turbines generally use steel pipes or D-shaped steel as longitudinal beams, steel plates as transverse beams, filled with foam inside, and covered with skin of fiberglass on the outside.