Acoustic field effects on a negative corona discharge

For a negative corona discharge under atmospheric pressure in different regimes, we investigated the effects of an acoustic field both on its electrical parameters and on the change in its visual appearance.We found that the application of an acoustic field on the true corona discharge, for particular currents, decreases the discharge voltage.The application of an acoustic field on the discharge in the filamentary streamer regime substantially extends the range of currents for which the discharge voltage remains more or less constant, i.e. it allows a substantial increase in the power delivered to the discharge.The application of an acoustic field on the discharge causes the discharge to spread within the discharge chamber and consequently, a highly reactive non-equilibrium plasma is created throughout the inter-electrode space.Finally, our experimental apparatus radiates almost no acoustic energy from the discharge chamber.