The shape of the blade and the angle of attack are different.
Wind power generation must have a suitable angle of attack that can convert the energy of the wind flow.
Although the helicopter must also have a suitable angle of attack, it can still achieve lift when the angle of attack is 9. Its blade profile can generate a higher pressure difference and lower in high speed operation.
The stiffness requirements of wind engines on materials will be much higher than those of helicopters.
How many meters are the longest blades of a wind fan?
With the changing times, the functions of these machines and equipment have been continuously improved , such as grain grinding, water transportation, power generation, etc. Traditional wind turbines come in various shapes and designs, but they are all being replacedcurrently by the same design. As a new clean and renewable energy, wind power has received much attention in recent years. When you walk near the wind turbine and admire the view of the wind leaves spinning quietly under the blue sky and white clouds, are you also curious about the difference between the 3 leaves and the 5 leaves of the wind turbine? wind turbine ?
Wind energy, as a new clean and renewable energy, has received great attention in recent years. When you walk near the wind turbine and admire the view of the wind leaves spinning quietly under the blue sky and white clouds, are you also curious about the difference between the 3 leaves and the 5 leaves of the wind turbine? wind turbine ?
To put it simply, three sheets are easy to balance, but if there are too many sheets, it will be difficult to balance and the cost will be high.
At fast speedwind, the power generated is proportional to the swept area of the wind rotor, that is to say that a wind rotor with 200 blades and a wind rotor with 1 blade can produce the same power.
The above figure shows that as the number of blades increases, the wind power utilization coefficient also increases, but in the process from 3 blades to 4 blades to 5 blades , the wind power utilization coefficient increases significantly, compared with the increase from 1 leaf to 2 leaves to 3 leaves, the increase is much smaller from the cost perspective, the gain exceeds the loss.
So, the fewer blades a wind turbine has, the better?
First of all, the advantage of multi-blade fans is the higher torque conversion rate, but in terms of energy conversion rate, the efficiency of 4-blade and 5-blade fans is lower than that of 3-blade fans. blade fans.
The reasonThe main reason is that the high resistance of multi-blade fans causes a considerable amount of turbulence which interferes with the rotation of the blades, thereby reducing the energy conversion rate.
It is therefore much better to choose 3 sheets than 4 or 5 sheets. (Well, the same goes for electric fans); Second, an insufficient number of blades will affect the efficiency of power generation.
In fact, there is currently a patent in Europe that has two leaves, placed vertically, which can double the effectiveness! However, the 2-blade wheel hub has a special structure with a rocker structure, and the fatigue problem is worse than that of the 3-blade wheel.
In addition, the fewer blades, the higher the rated speed. When the speed is high to a certain extent, the circumferential linear speed of the blade tip is very large, causing large wind resistancent. further increasing the power and speed of electricity production. Therefore, it is not good to have too few blades. Three blades are mainly for good balance and low cost. After a long period of verification, they have become a common form of fan today.
175 meters. According to the relevant information query, wind powerThe longest fan blade of the generator is 175 meters, and the blade diameter is the diameter of the wind wheel, which is closely related to the power of the wind turbine. The main shapes of wind turbine blades are 126, 110, 114, etc., and the corresponding blade sizes are 62 m, 54 m and 56 m.