According to the noise radiation mode, the noise produced by wind turbines can be divided into aerodynamic noise, surface radiation noise and electromagnetic noise. Among them, the surface radiation noise of the generator is mainly mechanical noise, and aerodynamic noise is the main noise source.
Aerodynamic noise is caused by the unsteady process of gas, that is, by the disturbance of gas and the interaction between gas and objects. Aerodynamic noise radiated directly to the atmosphere, including intake noise, exhaust noise and cooling fan noise. ?
Mechanical noise, usually the noise produced by vibration caused by the rotation of the machine body is called mechanical noise. It should be higher when running at high speed.
Electromagnetic noise is generated by the high-speed rotation of the generator rotor in the electromagnetic field.
Therefore, there will be a roaring sound when the wind turbine is running.