Measurements and modeling of laser-induced incandescence of soot at different heights in a flat premixed flame

Abstract

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Influence of soot aggregate size and internal multiple scattering on LII signal and the absorption function variation with wavelength determined by the TEW-LII method

“…Based on a recent evaluation of the absolute values of E(m) at λ = 1064 nm at different HAB in the same flame [34], the spectral dependence of soot absorption function values as a function of HAB is determined.…”

“…14 seems more justified. It is reasonable to state that the locations investigated in [1] are beyond the nucleation zone based on a more recent study conducted in the same flame [34], where soot sampling followed by TEM image analysis at different heights above the burner was conducted. Nevertheless, neglect of the term N * p exc,2 N * p exc,1 in the analysis of [1] is questionable.…”

“…For the determination of soot primary particle diameter and aggregate size distributions, soot was sampled at selected heights above the burner along the flame centerline for TEM imaging and subsequent image analysis [34]. At HAB below 9 mm, attempts to collect very young soot particles suitable for TEM image analysis were not successful, so data at HAB = 7 and 8 mm were estimated based on the trend of the lognormal parameters over the range of HAB above 9 mm [34].…”

“…At HAB below 9 mm, attempts to collect very young soot particles suitable for TEM image analysis were not successful, so data at HAB = 7 and 8 mm were estimated based on the trend of the lognormal parameters over the range of HAB above 9 mm [34]. TEM images of the sampled soot were analyzed for primary soot particle diameter and aggregate size distributions by Image J software.…”

“…TEM images of the sampled soot were analyzed for primary soot particle diameter and aggregate size distributions by Image J software. The modal primary diameter and the lognormal distribution parameters for D p and N p distributions at different HAB are summarized in Table 1, which are taken from the recent study of Bejaoui et al [34].…”