Simulation Test of Positive Corona Discharge at Blade Tip of Rotating Wind Turbine

Abstract

In order to simulate the corona discharge process of rotating wind turbine blade tip under the background of thunderstorm, a wind tunnel platform was designed and built, which can generate high-speed arc airflow. A rod-plate-rod electrode was set in the wind tunnel platform to simulate the positive corona discharge process of the actual rotating wind turbine blade tip. The results showed that with the increase of voltage and flow rate, the corona discharge changed from streamer corona to glow corona, and the corona current pulse decreased; This phenomenon is true when the direction of the flow field and the direction of the electric field are 60 degrees, 90 degrees and 120 degrees. It is speculated that in addition to blowing away the shielding ions near the electrode, the local pressure reduction caused by the high-speed airflow is also a major factor affecting the corona discharge.