Cs. Mcenally et Ld. Pfefferle, AROMATIC AND LINEAR HYDROCARBON CONCENTRATION MEASUREMENTS IN A NON-PREMIXED FLAME, Combustion science and technology, 116(1-6), 1996, pp. 183-209
Temperature and the concentrations of several major species, twenty on
e hydrocarbon intermediates ranging in size from C2H2 to C12H10, and s
oot were measured in an axisymmetric, atmospheric-pressure, laminar, c
oflowing methane/air non-premixed flame. Gas samples were extracted fr
om the flame with a quartz microprobe and analyzed on-line with single
-photon photoionization mass spectrometry. Horizontal profiles were ob
tained with millimeter spatial resolution at six heights above the bur
ner surface that spanned the soot-containing portion of the flame. The
flame contained numerous acetylenic species, benzene, many substitute
d benzenes, and several two or three-ring compounds at concentrations
exceeding one part per-million. The most abundant intermediate hydroca
rbons were acetylene, then allene and/or propyne and benzene. The maxi
mum concentrations of most linear hydrocarbons stayed roughly constant
at different heights, whereas polyacetylenes and aromatics accumulate
d with increasing height, with larger or more substituted aromatics pe
aking higher in the flame. At the lowest height where methane was unde
tectable, soot and all other hydrocarbons were also undetectable.