With 2 blades, the installation and transportation costs are lower than those with 3 blades. In addition, the tip speed ratio of the 2-blade is higher than that of the 3-blade. If it is used to generate electricity, the speed increase ratio of the gearbox is smaller than that of the 3-blade, so the cost of the gearbox is less.
ps
The hub structure of the 2-blade is special, with a seesaw structure, and the fatigue problem is more serious than that of the 3-blade. So each has its pros and cons.
Purely from the perspective of energy conversion, the wind wheel can be composed of any number of natural number blades. From the perspective of practical application, one blade has relatively high requirements on the transmission shaft, and it is difficult to ensure wind power generation during operation. The balance of the machine is affected, and the loss of components is relatively large. 2-piece manufacturers have already used it, but it is still difficult to ensure the smooth operation of the equipment, while 3-piece greatly enhances the stability of the equipment during operation, and the wind energy utilization coefficient is relatively high, which belongs to more application categories. Relatively speaking, the force of more blades is not as stable as that of 3 blades, the installation and operation costs are higher, and the efficiency is less improved. It is only suitable for small landscape wind turbines.