What does "blade stall" of a wind turbine mean?

Introduction What does "blade stall" of a wind turbine mean? After searching on Baidu, I found that the meaning is similar to what I said, but the person is much more professional. Axial fan blades are usually airfoil-shaped

What does "blade stall" of a wind turbine mean?

After searching on Baidu, it was similar to what I said, but the person was much more professional. Axial fan blades are usually airfoil-shaped. When the air flows in along the inlet end of the wing blade (attack angle α = 0°), it is divided into upper and lower airflows and flows against the airfoil. The airflow at the smooth "boundary layer" on the back and belly of the blade is streamlined. shape. There are two forces acting on the blades, one is the lift perpendicular to the blade surface, and the other is the drag force parallel to the blade, lift ≥ drag. When the direction of air flowing into the blade deviates from the inlet angle of the blade, it forms a positive angle of attack (α>0°) with the blade. When approaching a certain critical value (the critical value varies with different blade types), the airflow conditions on the back of the blade begin to deteriorate. When the angle of attack increases to a critical value, the boundary layer on the blade back is destroyed, and a vortex area appears at the tail end of the blade back, which is the so-called "stall" phenomenon. As the attack angle α increases, the separation point of the airflow moves forward, and the vortex area on the blade back expands from the tail end to the blade back, making the separation more serious, and even partial flow channel obstruction occurs. At this time, the lift force acting on the blade is greatly reduced, the resistance is greatly increased, and the pressure head is reduced. The blade itself has stall characteristics. When the wind speed is higher than the rated wind speed, the angle of attack of the airflow increases to the stall condition, causing vortices to be generated on the surface of the blade, reducing the aerodynamic efficiency of the blade and affecting energy capture. View original post >>

If the original poster’s wind turbine does not rotate in strong winds, the following may be the problem:

1. Check whether the three-phase AC circuit of the generator is Short circuit

2. Is the fan blade installed backwards

3. Is the motor burned out

4. Bearing problem

Original Problems with the other two fans:

When people are on the ground and feel no wind but the blades rotate very fast, this is normal, because people on the ground certainly feel there is no wind, and the fans are several meters high. , the direction of the wind is different, the main thing is to check whether the leaves are moving. If the leaves are obviously windy, it is normal for the fan to rotate so slowly, but the other one does not rotate. How far is the distance between the two units? Well, if it is too close, it is normal, because two units cannot be installed too close, which will affect its overall effect. In addition, the poster should be aware that there must be no high-rise buildings around when installing the fan, and it is best to install it in an open space. It is best to install it locally.

As far as these situations are concerned, please check if the above situation exists

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