Low-temperature filamentary plasma for ignition-stabilized combustion

In this work, an experimental study investigating dielectric barrier discharge (DBD) plasma-assisted ignition in methane-air flows at near-atmospheric pressure is presented. Discharges are produced using 10 ns duration high voltage pulses maximum 3 kHz pulse repetition rate. The goal to check the feasibility of plasma as source for ignition-stabilized combustion a wide range equivalence ratio, pressure, and flow speed conditions. To that end, four important characteristics investigated: 1) Ignition dynamics, 2) Minimum number required ignition, 3) Plasma energy per pulse, gas temperature, effective reduced electric field, 4) NOx production. continuous mode, we observe elongated flame outside region when mixture through discharge. due repetitively ignited kernels moving downstream with flow. High-speed intensified imaging used explore morphology dynamics. has filamentary nature which perceived pulse-to-pulse memory effects. For fuel-air mixtures, followed by kernel expansion splitting, propagation, consecutive ignition. time delay between events found be function speed, because achieved only previously moves out region, happens faster higher speeds. We performed optical emission spectroscopy burst mode further characterise parameters. air, temperature hence field increases By comparing air methane auto-ignition conclude observed low-temperature Parametric studies measurements suggest emissions low speeds, rates, low-pressure Overall, our DBD fast, repetitive, can near atmospheric