Effect of turbulent flow on an atmospheric-pressure AC powered gliding arc discharge

• DOI: 10.1063/1.5026703
• Publication Date: 2018-06-12T15:16:37Z
• Authors: Chengdong Kong; Jinlong Gao; Jiajian Zhu; Andreas Ehn; Marcus Aldén; Zhongshan Li
• Keywords: Glow discharge; Electric arc

A high-power gliding arc (GA) discharge was generated in a turbulent air flow driven by 35 kHz alternating current electric power supply. The effects of the rate on characteristics GA were investigated using combined optical and electrical diagnostics. Phenomenologically, exhibits two types discharge, i.e., glow type spark type, depending rates input powers. glow-type which has peak currents hundreds milliamperes, is sustained at low rates. spark-type characterized sharp spike several amperes with duration less than 1 μs, occurs more frequently as increases. Higher can suppress discharges moderate turbulence, but this effect becomes weak under high conditions. Physically, transition between glow- initiated short cutting events local re-ignition events. Short occur owing to twisting, wrinkling, stretching plasma columns that are governed relatively large vortexes flow. Local events, defined along columns, detected strong turbulence due increment impedance column consequently internal field strength. It suggested length scales smaller size penetrate into promote mixing surroundings accelerate energy dissipation. Therefore, influences ruling small vortexes.