Unsteady interaction of nanosecond surface sliding discharge with plane shock wave

摘要

In this study, we present experimental results on fast intensified charge-coupled device imaging and current measurements of a nanosecond surface sliding discharge interacting with a plane shock wave in a shock tube. A shock wave with Mach number 1.9-3.5 passed through the discharge area while the electric pulse was switched on. The discharge is initiated by a voltage pulse of 25 kV; the discharge current is similar to 1 kA. The discharge current in high-speed airflows including plane shock waves has been measured and the dynamics of the discharge radiation was studied with the nanosecond time resolution. It is shown that the inhomogeneity of the airflow-density field leads to a change in the discharge current and the structure of the discharge radiation strongly depending on the shock wave position in the discharge gap. The dynamics of the energy input is determined by the interaction of the shock wave with the discharge region, as measurements of the discharge current reveal.