A time-resolved imaging and electrical study on a high current atmospheric pressure spark discharge

摘要: We present a time-resolved imaging and electrical study of an atmospheric pressure spark discharge. The conditions the are those used for nanoparticle generation in discharge generator setups. oscillatory bipolar was generated between two identical Cu electrodes different configurations (cylindrical flat-end or tipped-end geometries, electrode gap from 0.5 to 4 mm), controlled co-axial N2 flow, supplied by high voltage capacitor. Imaging data with nanosecond time resolution were collected using intensified CCD camera. This evolution plasma morphology, total light emission intensity, rate expansion. High current probes employed collect about recorded allowed, among others, calculation equivalent resistance inductance circuit, estimations energy dissipated gap. By combining data, observations could be made correlation emitted power. It also observed that distribution is uneven, as it exhibits “hot spot” oscillating position axial direction, waveform. initial expansion cylindrical front found supersonic; thus, releases strong shockwave. Finally, results on channel comparable unipolar arcs. shows has similar behavior arc regime during conductive phase until oscillations stop.