Effect of radiation released by negative corona in airflow

The effect of airflow on the radiation characteristics of negative corona discharge was researched. The experiments were performed using three kinds of needle-ring discharge configurations in the high-speed airflow environment created by an air amplifier. The Trichel pulse waveform and radiation signal received by antenna were collected simultaneously. From the computation of smoothed pseudo Wigner-Ville distribution, it is found that the velocity and direction of airflow have a significant impact on the Trichel pulse period. When the direction of airflow is in parallel with the electric field, the Trichel pulse period increases; when the airflow is in the opposite direction of the electric field, the Trichel pulse period obviously shortens; and when the airflow is vertical to the electric field, the pulse period slightly shortens. The results show that the change of airflow has a less effect on the radiation spectrum of discharge which radiation energy is concentrated in 200 MHz.