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Based on nonequilibrium plasma dynamics of air discharge, the dynamic model of two-dimensional plasma is established by combining the plasma dynamic model, chemical reaction equations and Navier-Stokes equations. The discharge process of disk-shape plasma igniter is simulated. The process of discharge stream formation is obtained, which results from by electrons’ movement and aggregation. At  t  = 8.65 ns, a completely stable stream is formed. The simulation stream agrees well with the physical fact. The variations of electron density, O-atom and O-ion density are also presented. The variation trend of O-ions is similar to that of the electron density. At the time when the streamer is formed, the average particle density of O-ions reaches up to ∼10 18  m −3 . The number of active particles reaches that for starting the chemical reactions.

Numerical Investigations on the Nanosecond Pulse Discharge Process of Disk-Shape Plasma Igniter