Effect of high-frequency alternating electric fields on the behavior and nitric oxide emission of laminar non-premixed flames

► We studied the effects of AC electric fields on non-premixed flames. ► Flame image, FTIR pattern and chemiluminescent emissions were obtained. ► There exist three distinct regimes across the tested voltage range. ► The flame behaved non-monotonically as the increasing voltage. ► The flame behavior was explained by the competition of three effects.