Numerical Simulation of Premixed V-Flame

A Lagrangian front-tracking scheme is used to simulate turbulent premixed combustion of methane (CH4) - air and ethylene (C2H4) - air mixtures in open V-flames at various levels of turbulence intensity. The equivalence ratio has been varied from 0.8 1.4 φ =− for methane and 0.8 1.6 φ =− for ethylene with four turbulence intensity levels of 6%, 9%, 11% and 13%. The included-angle of the turbulent flame zone illustrates the effects that the equivalence ratio and turbulence intensity have on these mean flame characteristics. For all equivalence ratios, the mean burning rate W, and the total heat release rate Q, are seen to increase as the turbulence level is increased. However, for ethylene, changes in the turbulence are seen to have a diminishing influence on the burning rate at some equivalence ratios as the turbulence intensities increase. For a turbulent premixed V-flame, the maximum rate of heat release for combustion of both CH4 and C2H4 occur at equivalence ratios of 1.2 to 1.3.