The current study reports on the characterization of nanosecond repetitively pulsed plasma discharges in a pin-annular electrode geometry in quiescent, atmospheric, and non-reacting conditions. Two distinct plasma regimes were identified: diffused and filamentary. Diffuse, homogenous plasmas are observed at low and intermediate frequencies, while high frequencies produced localized, high intensity sparks at random locations along the annular electrode. High-speed schlieren visualization of the plasma-induced flow field showed production of shock waves by the plasma heating followed by fast gas expansion and vorticity generation. Preliminary particle image velocimetry measurements showed the induced flow velocity generated by the plasma discharge. These results provided an optimal set of parameters for generating plasma on an atmospheric-pressure burner. The design and fabrication of the atmospheric pressure burner to investigate the plasma-flame interaction is presented.
展开▼
