Abstract
Soot volume fractions and flame temperatures have been measured in laminar premixed ethylene-air flames at pressures between 5 and 20 bar for equivalence ratios ranging 1.7 to 2.8. The measurements have been carried out by applying laser-induced incandescence (LII) and light extinction for determining flame structure and soot volume fractions, and N2 coherent anti-Stokes Raman spectroscopy (CARS) for measuring temperatures in the pressooting zone. A one-dimensional flame model has been used. The equations have been solved with a computer code that includes both a detailed gas phase and transport model. The gas-phase reaction mechanism comprises recent results of kinetic data of aromatic compounds. Moreover, a standard soot formation and oxidation model is employed. Analysis of the experimental results obtained between 5 and 20 bar reveal major deficits in the submodels of polycyclic aromatic hydrocarbon (PAH) formation and of soot oxidation by OH radicals.
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