Flow characteristic investigation of localized arc filament plasma assisted turbulent jet and Bunsen flame.

This article investigates the effects of localized arc filament plasma actuators (LAFPAs) on air jet flow and methane/air premixed Bunsen flames across varying Reynolds numbers. Using high-speed Schlieren imaging and optical flow analysis, the study demonstrates that LAFPAs induce coherent, large-scale vortices that enhance turbulent mixing and accelerate flame front propagation, resulting in a significant increase—around 40%—in global turbulent consumption burning velocity. The plasma actuators generate near-wall arc discharges that produce high-pressure, high-temperature pulses, promoting flow convergence and flame surface stretch, including flame separation phenomena. Turbulence spectra reveal that plasma-induced fluctuations contribute similarly to both cold jet and reacting flows, highlighting the role of plasma–flame interactions in combustion enhancement.