Experimental investigation of the effects of nanosecond repetitive pulsed (NRP) discharges on ignition of methane-air mixtures
Résumé
We performed simultaneous planar laser-induced fluorescence (PLIF) and chemiluminescence on OH radical during methane-air mixture ignition and combustion initiated by nanosecond repetitive pulsed (NRP) discharges in a cubic chamber. Single PLIF images are taken at different time delays after the occurrence of the repetitive discharges while chemiluminescence images are synchronized to the discharge and record early stages of the ignition kernel as well as flame propagation. An analysis based on apparent flame velocity of the reactive front is used to understand the ignition process and the observed ignition delay reduction and flame front wrinkling as the number of discharge pulses is increased. In addition, particle image velocimetry (PIV) in an inert airflow was developed in order to characterize the hydrodynamic effects of NRP discharges, namely shock wave and hot kernel relevant to the observed flame properties enhancement. The main objective of this study is to understand the effects of NRP discharges in plasma-flame interactions for a better comprehension of the main physical processes involved in plasma assisted ignition and combustion of hydrocarbon flames.
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