Abstract
The dynamics of a blast (shock) wave from a pulsed single-channeled surface discharge and the flow velocity behind it are studied experimentally, numerically, and theoretically. The evolution of the flow field forming after the discharge initiation is captured using the Particle Image Velocimetry (PIV) method and the shadow method in a single-frame and multi-frame mode (with a high-speed camera). In experiments, the distance traveled by the shock wave is measured by the shadow technique; the flow velocity fields are obtained by the PIV method within 100 μs after the discharge initiation. The three-dimensional computational fluid dynamics (3D CFD) simulation based on the assumption of instantaneous energy deposition is in agreement with the experimental results. It is shown that, for a voltage pulse of 25 kV and an air pressure of 240 Torr, up to 30% of the total electric energy is instantly released into heat. The experimental and numerical results are also compared with that of the Sedov’s theory.
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