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chapter 5 turbulent diffusion flames - FedOA

chapter 5 turbulent diffusion flames - FedOA

obtained by subtracting

obtained by subtracting from the measured fluorescence that attributable to PAHs. The fluorescence signal due to particles starts at larger residence times with respect to gas-phase aromatics and reaches a quite constant value at the end of the flame. It precedes the incandescence signal. As expected, the signal is higher for the richer flame. Methane/oxygen combustion in laminar premixed condition, as expected, needs very fuel-rich condition in order to produce and therefore to emit soot particle, while NOC is formed also in less rich conditions in the premixed flames investigated and with a higher volume fractions respect to the soot particles. fv NOC, ppm 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 (C/O)/(C/O) stoich. Fig. 3.11 NOC volume fraction at 10 mm HAB in laminar premixed methane/oxygen flames vs. the equivalence ratio: Ф=(C/O)/(C/O)stoich. 68

fv soot, ppm fv, ppm 0.25 0.2 0.15 0.1 0.05 0 0.12 0.08 0.06 0.04 0.02 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 (C/O)/(C/O) stoich. Fig. 3.12 Soot volume fraction at 10 mm HAB in laminar premixed methane/oxygen flames vs. the equivalence ratio: Ф=(C/O)/(C/O)stoich. 0.1 0 PAH 0 5 10 15 20 25 HAB, mm 69 Soot NOC Fig. 3.13 Soot and NOC volume fraction at Ф = 1.76 (C/O=0.44) vs. the HAB.

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