抄録
The mechanism of flame-flame interaction is investigated using a one-dimensional direct numerical simulation of premixed methane-air flames propagating towards one another. At the beginning of the interaction process, the preheat zone structure is modified by the other incoming flame. However, this effect is not significant for inner-layer of the flame. In the final stage of the interaction, the reaction rate rapidly increases to 1.3 times of that of the corresponding non-interacting laminar flame while the value of scalar dissipation rate decreases. Also, the inner layer is significantly modified by this process. The higher reaction rate is produced due to the radical pool rapidly created by the diffusion and chemical reactions. This enhanced pool is compared with a well-stirred reactor result, and radicals and intermediate species show that the combustion mode transients to autoignition-like during the interaction.
