Shock wave influence on the afterglow of nanosecond discharge in air
Irina V. Mursenkova, Anna A. Ivanova, Alexander Yu. Kuznetsov
Source abstract
This work investigates the afterglow features of a nanosecond combined volume discharge in air in the presence of shock waves with Mach numbers 3.0–5.0. The discharge glow was recorded with nanosecond time resolution. The measurements were performed near the front of a plane shock wave and a diffracted shock wave. An increase in the glow intensity was observed during the afterglow stage in all experiments. The discharge radiation analysis was complemented by modeling of molecular nitrogen emission in shock-compressed discharge plasma. The modeling results indicate that the afterglow maximum is related to the kinetics of the excited states of molecular nitrogen under shock compression of the relaxing plasma. Plasma-chemical processes in discharge plasma interacting with a shock wave are important for plasma-aerodynamic approaches to controlling high-speed flows.
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