A study of the switching process a short (1 mm) gas gap initiated by spark discharge along dielectric surface was carried out method shadowgraphy with nanosecond time resolution. The presence shock wave propagating from cathode spot and signs intermediate accumulation invested energy in form excitation molecules or turbulent flow were detected. Keywords: shadowgraphy, discharge, waves, switch.

An improved spark ignition model has been developed and implemented into the KIVA-3V code. In this model, the spark ignition kernel growth is tracked by Lagrangian particle markers. The effects of turbulent flow and spark discharge energy on the kernel growth are considered. After the ignition kernel size exceeds a critical size related to the integral turbulent length scale of the flow, the tu...