Coupling an LES approach and a soot sectional model for the study of sooting turbulent non-premixed flames

Abstract

Due to their negative impacts on environment and human health, future regulations on soot emissions are expected to become stricter, in particular by controlling the size of the emitted particles. Therefore, the development of precise and sophisticated models describing the soot production, such as sectional

Analysis of radiative transfer in a turbulent sooting jet flame using a Monte Carlo method coupled to large eddy simulation

“…The numerical and the modeling approaches used for the description of the gaseous and solid phases in the present coupled simulation are identical to the setup used in a previous uncoupled simulation of the same flame [18]. They are here briefly summarized.…”

“…Being strongly characterized by unsteadiness effects, information for pre-cursors and soot particles cannot be extracted from the table and need to be transported. Therefore, for the description of the soot precursors evolution, a relaxation model [24] is used whereas for the solid phase a sectional model, already validated in laminar [17] and turbulent [18] configurations, is considered here. Such an approach allows a discretized representation of the soot particles size distribution in the particles volume space.…”

“…nucleation, condensation, surface growth, oxidation and coagulation, can then be described in details by accounting for the size of soot particules. While this approach is often deemed expansive for computational fluid dynamics, its recent combination with LES has demonstrated its feasibility, validation and adequacy to describe detailed informations about soot particles population and their dynamic [18]. In this approach, small soot particles are considered as spherical particles with a volume v and a diameter…”

“…The first one assumes no radiative heat losses. The second simulation accounts for radiation through a simple optically thin model [18]. Finally, in Sec.…”

“…To our knowledge, such a simulation represents the first example of a large-eddy simulation based on a soot sectional model coupled with a radiative transfer solver. Soot modeling accounts for a detailed description of the chemical and the collisional processes governing soot production and has already been validated on laminar [17] and turbulent [18] flames. In addition, choosing the Monte Carlo solver for the RTE resolution yields accuracy to the computation of the associated radiative transfer.…”