In short, it is a single blade type: under the same size, in order to obtain the same amount of energy, the single blade type requires a higher speed. At the same time, this means more noise and. visual pollution. , greater ecological impact; the rotation is unbalanced and requires counterweight, and the advantages of the lower ratio and lighter mass gearbox are weakened; So there is no cost advantage. Double blade type: The advantages and disadvantages are similar to the single blade type; Three-blade type: It can achieve its own dynamic balance, has lower speed, low noise, and is not easily hit by birds. More blades: low speed, requiring a high ratio gearbox, heavy, causing problems in manufacturing, installation, operation and maintenance, easy to hit birds, oh, no, these are d blows 'birds ; (THEblades are relatively large in size, with a diameter of up to tens of meters.) In summary, three-leaf blades are the most suitable.
Why do wind turbines only have three blades?
I personally think that if wind turbine blades are made like electric fan blades, the first reason is that they are too heavy; It was because of the strong wind that the connecting rod exploded. Fan blades are made like wind turbines, which must spin at high speeds to be efficient. This will inevitably consume energy and require higher structural strength of the blades.
From the point of view of cost and rotational balance, the three-piece design is the most suitable. Theoretically, the smaller the number of blades in a wind turbine, the higher the rotation speed under power. However, given the stability requirements of the center of gravity, the wind turbinesThree-blade wind turbines are the most practical horizontal axis wind turbines today. To put it simply, 3 leaves are easy to balance. Too many leaves make balancing difficult and expensive. Multi-leaf fans have large resistance, which will cause factors that interfere with the rotation of the blades and reduce the energy conversion rate, so choose. 3. Leaves are much better than 4 or 5 leaves.
A wind turbine is an electrical device that converts wind energy into mechanical work, which causes the rotor to rotate and ultimately produces alternating current. Wind turbines generally consist of components such as a wind wheel, a generator (including devices), a steering (tail), a tower, a speed-limiting safety mechanism, and an energy storage device.
The operating principle of a wind turbine is relatively simple. The wind wheel turns under the influencethe wind. It converts the kinetic energy of the wind into the mechanical energy of the wind wheel shaft. driving the wind wheel shaft to produce electricity. Generally speaking, wind energy is also solar energy, so we can also say that a wind turbine is a thermal energy generator that uses the sun as a heat source and the atmosphere as a heat fluid. work.
The main function of the wind turbine rotor blades is to capture the wind and transmit the wind force to the rotor axis. On a modern 600-kilowatt wind turbine, each rotor blade is about 20 meters long and designed to resemble an airplane wing.