Ignition, Sustained Flame, and Extinction of a Dielectric-Barrier-Discharge Altered Hydrogen Jet in a Cross-Flow

摘要

Plasmas can modify combustion, altering timescales and radical production. To explore opportunities for this, a novel dielectric barrier discharge actuator geometry is used to produce plasma with the aim of altering a low momentum hydrogen fuel jet exhausting into a cross-flow. The dielectric material is quartz, chosen after careful consideration of material response to both the plasma and thermal energy produced by combustion. The effect of the plasma discharge is studied in all three periods of combustion lifetime: ignition, sustained flame, and blow-off. The likelihood of sustained ignition of a ≈ 1 m/s H_2 fuel jet is investigated, both with and without the dielectric barrier discharge plasma operating under various cross-flow conditions. The effect of the plasma on the sustained flame is also studied using water vapor emission as a marker for the flame intensity. Finally, the blow-off characteristics of a higher momentum H_2/N_2 flame at various levels of fuel concentration is explored with the plasma shown to effect the cross-flow velocity the flame can experience before extinction.