Abstract
Numerical study is conducted to grasp preferential diffusion effects on flame characteristics in H₂/CO syn-gas diffusion flames diluted with CO₂. The models of Sun et al. and David et al., which have been well known to be best-fitted for H₂/CO synthetic mixture flames, are evaluated for H₂/CO synthetic mixture flames diluted with CO₂. Comparison of flame structures with mixture-averaged species diffusion and suppression of the diffusivities of H2 and H was made. The behaviors of maximum flame temperatures with those species diffusion models are not explained by scalar dissipation rate but by the nature of chemical kinetics. Importantly-contributing reaction steps to heat release rate are also compared for the three species diffusion models in H₂/CO/CO₂ flames with and without CO₂ dilution.
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