Abstract
Measurements of HCN, NH 3 and NO concentrations in the burnt gases of a number of fuel-rich hydrocarbon-air flames have been made. Only HCN and/or NO leave the primary reaction zone of all flames studied, while NH 3 is formed later in the burnt gases. The behaviour of these species in the post-flame zone is qualitatively similar to that observed in flames seeded with fuel-nitrogen. The generation of nitrogen compounds from molecular nitrogen is obviously due not only to the Zeldovich mechanism but also to some as yet unidentified hydrocarbon-N 2 reaction. The characteristics of this reaction are that it begins to dominate in flames richer than φ = 1.2, and that the total amount of combined nitrogen generated increases only slowly as the flame is made richer, even though the distribution of this nitrogen amongst HCN, NH 3 and NO varies markedly.
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