OH production by transient plasma and mechanism of flame ignition and propagation in quiescent methane–air mixtures

摘要: Abstract Transient plasma induced production of OH is followed in a quiescent, stoichiometric CH4–air mixture using the planar laser fluorescence technique. Ignition and subsequent flame propagation, for both transient traditional spark ignition, are observed with high speed camera (2000 fps). The generated 70 ns FWHM, 60 kV, 800 mJ pulse. was confirmed throughout chamber volume; however, mean number density found to decay below 1.3 × 10 14 cm −3 near 100 μs. Nonetheless, ignition by decidedly faster than ignition. Using camera, initiated occur along length anode at approximately 1 ms, leading formation wrinkled, cylindrically-shaped flame. Analysis front propagation rates shows that flames ignited propagate essentially consistent well accepted literature values methane–air mixture. This supports notion residue plasma, if any, has little effect on propagation.