Direct numerical simulations of two-dimensional diffusion flame and a vortex were conducted to clarify the interaction between a vortex and flame in the turbulent diffusion flame. Calculation of N_2 diluted H_2-O_2 flame with 9 species and 21 elementary reactions was conducted directly by using highly accurate numerical schemes. Near the flame, vortex motion is significantly affected by the thermal expansion and baroclinic torque which appear in the vorticity transport equation. The change in vortex shape, which is elongation in the flame direction, is caused by these two effects. Elame structure is also changed by the presence of vortex. The reaction rate shows the peaks in the relatively low temperature region where the vortex convects ambient hydrogen into the flame. H_2 convected into the flame enhances OH reaction. As a result, the temperature and mass fraction distributions show different behavior with the reaction rate.
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