Nanosecond ionization of an area of flowing around a rectangular ledge by a high-speed flow

In this paper, we describe the phenomenon of redistribution of plasma and current of a pulsed volume discharge based on self-localization upon initiation in an unsteady flow in a shock tube with a cross section of 48 $\times$ 24 mm. In the gas-dynamic channel section with a parallelepiped-shaped ledge in the flow behind the shock wave front with Mach numbers 2.8–3.5, short-lived plasma channels were shown to be realized in the separation zones near the ledge for 2800 $\mu$s.