Effect of radiation on a spray jet flame

Two-dimensional direct numerical simulations (DNS) with and without a radiation model are applied to a spray jet flame, and the effect of the radiation on the spray flame behavior is studied in detail. N-decane (C ₁₀H₂₂) is used as a liquid spray fuel, and the droplet motion is calculated by the Lagrangian method. As the combustion reaction model, Arrhenius formulation (ARRS) and enthalpy-based flamelet/progress-variable approach (FPVA-E) for a one-step global reaction are employed. Radiation is taken into account using the discrete ordinate method. The validity of the FPVA-E coupled with the radiation model is assessed by comparing with the reference solution obtained by the ARRS with the radiation model. The results by the ARRS with the radiation model show that the radiation acts to enhance the thermal diffusion and greatly affects the spray flame structure. The effect of the radiation on the spray jet flame can be well captured by the FPVA-E coupled with the radiation model.