Fully coupled sectional modelling of soot particle dynamics in a turbulent diffusion flame
نویسندگان
چکیده
Soot particle dynamics, including size distributions (PSDs) and related statistics, are of increasing practical significance due to evolving regulatory demands. The combination a mass number density preserving sectional model with transported joint probability function (JPDF) method ensures full coupling the scalar space, e.g. soot gas phase reactions radiative heat losses, within that can represent ignition/extinction phenomena as well slow (low Damköhler number) inception oxidation chemistry in turbulent flames. This approach is here applied sooting non-premixed Sandia ethylene jet flame via 78-dimensional joint-scalar enthalpy, species 62 sections. nucleation treated global step from acetylene pyrene rate fitted using comparisons detailed chemistry. surface growth PAH analogy considered O, OH O2 Hertz–Knudsen approach. Comparisons measured temperature, mean volume fraction show good agreement while introduction zero diffusivity leads substantially improved predictions RMS fraction. calculated PSDs at burner centreline transition one two-peaks along axial direction mode second peak 14 32 nm. Scatter plots, statistics parameters chemical source terms across sections suggest dominant when unimodal competition oxidation, coagulation/aggregation PSD shape transition. It also shown local extinction events lead presence cool fuel lean mixtures.
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ژورنال
عنوان ژورنال: Proceedings of the Combustion Institute
سال: 2021
ISSN: ['1873-2704', '1540-7489']
DOI: https://doi.org/10.1016/j.proci.2020.06.093