Numerical Simulation of Unsteady CH4/AIR Jet Diffusion Flame

초록

The dynamic structures of unsteady CH4/Air jet diffusion flame with a flame-vortex interaction were numerically investigated. A time-dependent, axisymmetric computational model and a low Mach number approximation were adopted for the present calculation. A two-step global reaction mechanism which considers 6 species, was used to calculate the reaction rates. The results showed that the temperature and species concentrations have different three values even for the same mixture fraction in the flame-vortex interaction region. It was also found that the flame surface is not deformed by the inner vortex in upstream region, while in downstream region, the flame surface is compressed or stretched by the outer vortex roll-up. The present unsteady jet flame configuration accompanying a flame-vortex interaction is expected to give good implications for the unsteady structures of turbulent flames.