Experiments were conducted with atmospheric air plasmas at temperatures around 2000 K in order to increase the electron number density to approximately 1013 cm-3 by means of an applied DC discharge and an electric pulse in parallel to the DC discharge. The DC discharge produces a stable region of elevated electron number density, in agreement with two-temperature kinetics calculations. In the pulsed experiments at the end of the 10 ns pulse, the ionization level was measured to be about 1013 electrons/cm3. Following the pulse, the electron number density decreased to 1012cm-3 in approximately 12μs, in good agreement with the chemical kinetics model. This result suggests that elevated electron number densities of the order of 1013cm-3 can be maintained in low temperature air plasmas by means of repetitively pulsed discharges. In this paper, we present results of the DC and pulsed experiments, as well as two-dimensional CFD simulations of the DC experiments. The computational model uses the Stanford two-temperature chemical kinetics model for the plasma, as well as finite-rate models for vibration-electronic energy relaxation and electron translational energy relaxation. The computational results are in good agreement with the measured electron concentration, temperatures, and cathode fall.
|Original language||English (US)|
|State||Published - 2000|
|Event||31st Plasmadynamics and Lasers Conference 2000 - Denver, CO, United States|
Duration: Jun 19 2000 → Jun 22 2000
|Other||31st Plasmadynamics and Lasers Conference 2000|
|Period||6/19/00 → 6/22/00|