Abstract
In this study, combustion mechanisms and effects of flame stretch on the local burning velocity of two-component fuel mixtures of DME, hydrogen and methane were investigated by chemical kinetics computations. Lean and rich mixtures having nearly the same laminar burning velocity were prepared by adding nitrogen to mixtures where the fuel mixing rate δ is varied from 0 to 1 at equivalence ratios of 0.4-2.0. As a result, it is elucidated that Markstein numbers of lean two-component fuel mixtures changed monotonically with increasing 8 depending on the effective Lewis number, however, those of rich flames showed a complicated trend with change in the equivalence ratio and δ. These characteristics of response to flame stretch were discussed in light of the chemical reaction mechanisms.
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