Laser induced fluorescence investigation of the chemical impact of nanosecond repetitively pulsed glow discharges on a laminar methane-air flame

Abstract This paper reports on an experimental investigation of the chemical impact nanosecond repetitively pulsed (NRP) glow discharges a laminar methane-air flame. The chosen configuration was lean wall stabilized flame where NRP were generated across front. After careful selection excitation lines, planar laser induced fluorescence OH and CH conducted. Comparisons between base (without plasma actuation), those obtained during steady state transient regimes actuation, performed. First it is shown that regime, intensity in could be increased by up to 40% 10%, respectively. In addition, life time discharge channel estimated 3 4.5 µs. regime at beginning actuation showed began affected long before detected channel, upstream 40 ms increase simultaneously both area. Based current knowledge chemistry, explanations for these results are proposed.