Tail wing function of small wind turbines

Small wind turbines are designed with tail fins because they can adjust direction. When the sweeping direction of the fan impeller is incorrect, the airflow velocity and pressure on both sides of the tail wing will be different.

Large wind turbines rarely have tail fins because the mass of large machines is quite large. If you have to rely on differential pressure to turn, the area of the tail wing is too large to accept because it is too heavy to rotate freely. The connection between large wind turbine units and the tower is usually achieved through large roller bearings or sliding gear rings, and the rotation of the nacelle is controlled by a yaw drive.

In fact, the motor drives the direction of rotation so that the surface of the impeller is always perpendicular to the wind direction. According to the trigonometric function of energy loss, when perpendicular to the wind direction, the tangent of the angle between the impeller and the wind direction is 1, and there is no loss. Wind energy can be converted into the rotational kinetic energy of the wind turbine as much as possible.

When the wind blows, if the tail wing of a small wind turbine has an angle with the wind direction, it will be subjected to tangential force, pushing the wind turbine to rotate around the tower until the angle with the wind direction is zero, thus automatically adapting to the wind direction. The wind direction is determined by the anemometers on the left and right sides of the tail. The principle is that the traditional wind vane is a receiver for ultrasonic waves. The ultrasonic transmission time for quality inspection of two anemometers is affected by the wind speed and direction between them.

The blades of small wind turbines rotate with the wind at high altitudes, and the green and environmentally friendly energy generation mode is influenced by natural wind power. The current generated by the wind turbine varies from high to low, but the voltage remains stable. The electricity generated by the fan will be boosted to 35kV inside the tower. After transmission, this electricity will be sent to the wind farm's boosting station and transmitted to the power grid.