Large wind turbines generally have three blades, while small wind turbines have two blades. Large wind turbines require a stable rotation speed, so they have a set of wind angle adjustment mechanisms inside. Small wind turbines do not have this mechanism because they are simple. Fewer and longer blades can use more upwind area, and longer blades are equivalent to the length of the moment arm. Prevents an increase in the number of blades needed due to short blades.
This is the fatal lack of energy of old-style wind turbines. The blades are few and long, with a cantilever beam structure, and the blade roots support enormous stresses. The roots of the leaves are very thick and heavy. There are few blades, low rotation speed and lots of air leaks. Where does the 40/100 efficiency come from?
He has less thanblades and a fast rotation speed. Given the balanced center of gravity, it is only suitable for small children.
Ask a question: Why does a wind turbine's windmill only have three blades?
The concept of the number of blades on a wind turbine wind turbine - the strength of the wind turbine. The ratio between the total surface area of the wind turbine blades (projected in the direction of the wind) and the surface area where the wind passes through the rotor (swept rotor surface) is called solidity (or solidity ratio, volume ratio), and constitutes a reference data for wind turbines. ?
These are several types of horizontal axis wind turbines, with schematic diagrams showing four types of wind turbines: single blade, double blade, three blade and multi blade. The method of calculating solidity. of the wind turbine is as follows: S is each the projected surface of the blades in the direction of the wind, R is the radius of the wind wheel, B is the number of blades and σ is le report of realism. σ=BS/πR2.
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. 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.
From the point of view of using wind energy, using two blades is the best solution. But there is a drawback: the vibrations generated by the fan during operation have a great impact on the lifespan of the fan. fan.And three blades One blade can solve this problem very well. The disadvantage of three blades is that its wind energy utilization rate is not as good as that of two blades. But weighing the pros and cons, I use toalways three blades.