Flamelet modeling of two-phase kerosene combustion flow fields using a detailed chemical reaction mechanism

Two-phase combustion flow fields in a model combustor were numerically simulated using realizable k-ε turbulent model,particles stochastic trajectory model,flamelet models and the detailed chemical reaction mechanism of aviation kerosene.The detailed reaction mechanism was assembled using the combustion mechanism of surrogate fuel (80% decane and 20% 1,2,4-trimethylbenzene by mass fraction) and NO_x formation mechanism.The accuracy of flamelet modeling of RP-3 kerosene combustion flow fields (especially for NO emissions) employing the detailed reaction mechanism was investigated by comparison with the experimental data.The result shows that the temperature and CO₂ concentrations predicted using the steady flamelet model are in good agreement with the experimental data,but the NO emissions have a bigger deviation.The use of unsteady flamelet model significantly improves the prediction accuracy of NO concentrations and shows good agreement with the experimental data in condition 1 (inlet Mach number 0.16,inlet temperature 537K,fuel-air ratio 0.0048,atmospheric pressure),but NO emissions are overpredicted in condition 2(inlet Mach number 0.155,inlet temperature 523K,fuel-air ratio 0.010,atmospheric pressure).