二次元予混合乱流火炎伝ぱの直接数値シミュレーション : 選択拡散の影響〔熱工学, 内燃機関, 動力など〕

概要

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Recently, Kido et al. have revealed experimentally that the difference in the molecular diffusivity of fuel and oxygen has an influence on turbulence burning velocity of premixed mixture. In this study, direct numerical simulation of turbulent flame propagation of premixed mixture was carried out in two dimensional space. In order to clarify the influences of molecular diffusivity of fuel on turbulent flame, the diffusion coefficient of fuel was varied from smaller to larger than that of oxygen keeping the other mixture properties constant. In the case that the diffusion coefficient of fuel was different from that of oxygen, equivalence ratio of the mixture near flame front was varied locally according to the flame curvature. This variation of local equivalence ratio depended on the relative molecular diffusion speed of fuel and oxygen regardless of the initial equivalence ratio of the mixture.
社団法人日本機械学会の論文
1998-04-25