高Reynolds数水素・空気乱流予混合火炎の局所火炎構造(燃焼・反応(1),一般講演)

概要

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The effects of turbulence characteristics on local flame structure and the fractal feature of flame front are investigated by direct numerical simulation (DNS) of hydrogen-air turbulent premixed flames propagating in three-dimensional homogeneous isotropic turbulence at high Reynolds number. DNS is conducted for the flame regime of thin reaction zones. Distributions of temperature, mass fraction of major species and heat release rate show that quite complicated flame structures are created in high Reynolds number turbulence. Flame peninsulas towards unburned mixture are frequently observed and tend to diminish due to the heat loss to surrounding low temperature unburned mixture. Multi-layer structure in large scales is created by large scale flame folding and connections. Even for hydrogen-air premixed flames, local extinctions occur at the edge of the corrugated flame front. The fractal characteristics of the flame front are also investigated and strong correlation between the inner cutoff in Kolmogorov length unit and the ratio of the diameter of coherent fine scale eddy to the laminar flame thickness is shown.
日本流体力学会の論文
2008-09-04