Author: A. Saylam
Document type: Published journal article
Journal: Reactions
Year: 2023
Volume: 4
Pages: 155–170
This study numerically investigates the influence of burner optical ports, edge inter-matrices, and pressure on soot formation and the behavior of premixed sooting flames in a high-pressure burner.
Three-dimensional CFD simulations of premixed C2H4/air flames at 1.01 and 10 bar were first performed using a one-step chemistry approach to evaluate the suitability of prospective axisymmetric two-dimensional and one-dimensional simulations.
The justified two-dimensional simulation approach shows that edge inter-matrices can generate axial vorticity, while high pressure can generate axial multi-vorticities due to the strong thermal expansion of burnt gases. These flow structures lead to axial multi-sooting zones, which correspond experimentally to visible luminous soot streaks.
The simulations indicate that relatively low-temperature regions below 1800 K and enhanced gas mixing around and above the edge inter-matrix location can promote soot-formation conditions. However, the influence on the centerline soot volume fraction remains limited, with effects below 3% for the atmospheric flame and below 10% at 10 bar.
Increasing combustion reactivity by decreasing the rich equivalence ratio or increasing pressure promotes earlier soot-precursor formation and shifts the sooting zone upstream.
PDF: high-pressure-sooting-flame.pdf
Saylam, A. (2023). Behavior of Premixed Sooting Flame in a High-Pressure Burner. Reactions, 4, 155–170. https://doi.org/10.3390/reactions4010009