LAUSR

In order to understand the impacts of discharge conditions on the discharge characteristics of a nanosecond pulsed surface dielectric barrier discharge, the effects of gas pressure, temperature, and velocity are numerically investigated by using a three-equation drift-diffusion model with a 4-species 4-reaction air chemistry. The scaling laws of plasma morphology and gas heating on pressure are obtained for further reduced modeling in the flow-control application. Theoretical discussions on the scaling laws are carefully conducted. When the pressure increases in the studied range, while the temperature is fixed, the streamer propagating velocity ( V), the plasma sheath thickness ( h), the maximum streamer length ( L), the total discharge energy ( Q D _ e i), and the gas heating ( Q G H) decrease. The plasma morphology and the gas heating have different scalings on the pressure according to V ∼ e p, h ∼ p − 0.8, L ∼ p − 0.8, Q D _ e i ∼ p − 0.5, and Q G H ∼ p − 0.5. When the temperature decreases in the in...