Large-eddy simulation (LES) of a pressurized, swirl stabilized, well-characterized aero-engine model combustor have been conducted at different operating conditions. The combustor is fueled by ethylene and features a secondary air injection system to mimic the rich-quench-lean concept (RQL) of aircraft engine combustors. This paper discusses the influence of three different equivalence ratios on the sooting behavior by means of numerical simulation. A finite-rate chemistry model (FRC) with assumed probability density function model (APDF) is used to describe the turbulent combustion. Polycyclic aromatic hydrocarbons (PAHs), their radicals and soot are modeled by a recently developed sectional approach. Feedback effects such as consumption of gaseous soot precursors by growth of soot are inherently captured by solving the governing equations simultaneously. Quantitative measurement data obtained by different laser diagnostic techniques are used for validation. Predicted temperatures and velocities are in excellent agreement to the measurements. The influence of different equivalence ratios on the sooting behavior of the combustor is qualitatively captured well by the soot model. Details of the soot evolution are discussed and the remaining differences between the simulation and the measurements are analyzed in detail.

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