Soot formation in turbulent flames of ethylene/hydrogen/ammonia

This paper presents an experimental study of turbulent non-premixed jet flames ethylene/nitrogen where the nitrogen is substituted with different proportions hydrogen and/or ammonia. The focus largely on effects and ammonia soot production in flames. A combination pointwise, laser-induced fluorescence visible UV bands (LIF-UV–visible), incandescence (LII) used to measure precursors along flame centerline. All signals are collected at a repetition rate 10 Hz fast photomultiplier tubes resolve time decay. In separate experiment, joint imaging LIF-OH CH also performed kHz. Hydrogen substitution found increase soot, whereas inhibits formation. peak mean volume fraction almost factor 3 lower 25% case comparison case. signal decay constant decreases substitution, implying formation smaller nanoparticles. remains unaffected substitution. Measured peaks LIF-CH reduced but only regions upstream formed. Further downstream sooting region, neither OH nor appear be affected by N 2 H or NH .