セル状予混合火炎の不安定挙動に及ぼす熱損失効果(熱工学,内燃機関,動力など)

概要

論文の詳細を見る
The effect of heat loss on the unstable behavior of cellular premixed flames is investigated by two-dimensional unsteady calculations of reactive flows, based on the diffusive-thermal model equation. To obtain the relation between the growth rate and the wave number, i.e., the dispersion relation, a sufficiently small disturbance is superimposed on a planar flame. The superimposed disturbance grows exponentially with time, which is consistent with the prediction of linear analyses. As the heat loss becomes larger, the growth rate increases at small wave numbers and decreases at large wave numbers. To investigate the unstable behavior of cellular flames, the disturbance with the linearly most unstable wave number, i.e., the critical wave number, is superimposed. The superimposed disturbance evolves, and the cellular-flame front is formed, owing to intrinsic instability. The larger the heat loss, the deeper the cell and the greater the burning velocity. When the heat loss is taken into account, the lateral movement of cellular flames is more likely to be observed, which is observed only at sufficiently low Lewis numbers for adiabatic flames. In addition, the chaotic behavior of cellular-flame fronts is observed in non-adiabatic flames with low Lewis numbers.
一般社団法人日本機械学会の論文
2004-11-25