Ultrasonic Field Effects on Corona Discharge in Air

The application of ultrasonic waves on corona discharge causes the existence of pressure gradients in the discharge gap. According to Meek´s criterion, formation of streamers in the discharge and therefore the discharge profile is affected by these pressure gradients. We calculated the distribution of ultrasonic pressure in the interelectrode gap and we demonstrated experimentally that the discharge profile is affected by this ultrasonically induced pressure distribution.