Algebraic model for chemiluminescence emissions suitable for using in complex turbulent propane flame simulations

The work presents a simplified algebraic model for calculating the $\mathrm{OH}^*$, $\mathrm{CH}^*$, and $\mathrm{CO}_2^*$ concentrations within the context of reduced propane flame oxidation treatment. Excited and precursor species are obtained through post-processing of the basic simulation results, employing well-established quasi-steady state expressions produced from the detailed chemiluminescence kinetics. Inaccuracies introduced in these derivations are compensated by applying correction functions fitted by comparing model computations against detailed chemistry results. The formulation is tested in a range of laminar flames to determine its suitability for extension into turbulent flame simulations.