Dynamics of ns-SDBD Plasma Formation for Flow Control by Superfast Local Heating

Paper presents results of numerical modeling of nanosecond surface dielectric barrier discharge (ns-SDBD) for flow control using a heat release in highly nonequilibrium pulsed plasma. The major attention is paid to the effects based on ultrafast (on nanosecond time scale at atmospheric pressure) local heating of the gas, since at present the main successes in high-speed flow control using gas discharges are associated with namely this thermal effect. Modeling the development of all structural elements of SDBD is a non-stationary three-dimensional problem in which all parameters of the discharge plasma change abruptly at small time and space scales. In this work, we tried to take into account all the most important processes, and obtained a reasonable agreement between the electric field measured in [8] at an air pressure of 345 Torr and a voltage at the high-voltage electrode of 20 kV, a dielectric layer 0.5 mm thick with dielectric permittivity coefficient \epsilon = 3.0. Comparison with the experiment demonstrates a good agreement, which shows the correct accounting for the main processes in the numerical model.