The three-blade type of wind power generation may be because:
The angle between the three-blade type is 120 degrees. The wind drives the three-blade generator to move, starting to be parallel to a certain blade, driving it to rotate forward. Its driving effect gradually becomes obvious. After forming an angle of 60° with this blade, the movement direction of the blade gradually becomes consistent with the direction of wind movement. , the effect of wind power gradually weakens. At this time, the angle between the wind force and the next blade is 0 degrees (that is, the wind force and the next blade are on the same parallel line), and the wind force will continue to act on the next blade.
If the three-blade type is changed to a four-blade type, the angle between the blades is 90°. When the wind is acting at a 90-degree angle to a certain blade, it will be at a 0-degree angle to the next blade. The wind is still acting on the first blade, but it will also act on the second blade. If the wind force at that time is different, for example, the wind stops for a while, then it will cause one blade to push forward, while the other blade will stop. This is not only detrimental to wind power generation, but also consumes more equipment.
The problem with two-leaf blades is that the continuous force of wind blowing cannot be connected. One blade moves forward without the other blade being blown forward by the wind, causing the power generation device to not rotate well. .
It can be concluded that with four blades, the interaction between the blades is relatively large, which affects the result of their joint action and reduces the efficiency. As for the two blades, the blades are interfering with each other, and the effect between them is also obvious, which is also undesirable.
It can be said that in the three-bladed wind power generation, two blades play a derivation role (advantageous), and one blade plays a blocking role (disadvantage, the blade that is lifted upward). The shape of the wind turbine blades is not straight, but has a curvature, which is also to catch the wind when it is advantageous, and to let the wind pass through it when it is disadvantageous.
In this process, using middle school physics knowledge, wind energy is converted into kinetic energy and potential energy of the blades, and the kinetic energy and potential energy of the blades are converted into electrical energy, regardless of friction. A wind with a force of 2 Newtons (the force is 2 Newtons/square meter) blows through a three-page generator and acts on one of its blades. Find out how many joules it generates after it goes from an angle of 0 degrees to the wind direction to an angle of 60 degrees with the wind direction...? (Should give a picture)
Thinking process, if the wind force is given, multiplying it by the area of the blade is the force. Please consider the angle and multiply it by the sin or cos angle. The role here is a question of a moment arm. It is simpler to think about it this way. If the work is equal to f (action force) times s (distance), the radius of different points on the blade will be different depending on the wind force. The distance is also different. The result is that the work done by the wind pushing the blades to move plus the work done by the potential of the blades in this process (the work done by gravity) is the work of generating electricity