We know that the electric fan is driven by the motor to rotate the fan blades, which generates a pressure difference between the front and rear of the blades, which promotes the flow of air. The working principle of the propeller anemometer is just the opposite. The blade system aligned with the airflow is affected by the wind pressure, and a certain torque is generated to rotate the blade system. Usually a propeller-type speed sensor measures the wind speed by rotating a set of three-blade or four-blade propellers around the horizontal axis. .
