噴流噴霧火炎挙動に及ぼす輻射の影響(熱工学,内燃機関,動力など)  [in Japanese] Effect of Radiation on a Spray Jet Flame(Thermal Engineering)  [in Japanese]

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_<10>H_<22>) 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 enth-alpy-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.