Premixed flame propagation in a high-intensity, large-scale vortical flow
Premixed flame propagation in a high-intensity, large-scale vortical flow
复制标题
高强度、大范围涡流中的预混火焰传播
DOI：
10.1016/0010-2180(95)00240-5
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发表时间：
1996
影响因子：
4.4
通讯作者：
R. Aldredge
中科院分区：
文献类型：
--
作者：
R. Aldredge
通过求解控制标量场演化的前沿传播方程，数值研究了预混火焰通过大尺度旋涡流场的传播，标量场的零级表面定义了自传播界面的位置。火焰前缘被认为是以恒定的速度垂直于其自身传播，并且整个火焰的密度变化被认为是零。平均燃烧速率计算为大的速度波动强度，因为该配方允许自然形成的口袋未燃烧的气体下游的反应前。波纹状火焰阵面的传播速率随时间呈周期性变化，在大的强度下，其平均值随速度波动强度呈线性变化。一种机制是确定的平均燃烧速率的波动强度的增加，在一个中间范围内的强度，在零粘度极限的敏感性降低。
The propagation of a premixed flame through a large-scale vortical flow field is studied numerically by solving a front propagation equation governing the evolution of a scalar field whose zero-level surface defines the location of a self-propagating interface. The flame front is considered to propagate normal to itself with a constant speed, and the density variation across the flame is considered to be zero. Average burning rates are calculated for large velocity fluctuation intensities, as the formulation allows naturally for the formation of pockets of unburned gas downstream from the reaction front. The propagation rate of the corrugated flame front is found to vary periodically with time, with an average that varies linearly with velocity fluctuation intensity at large intensities. A mechanism is identified for the decreasing sensitivity of the average burning rate to increases in the fluctuation intensity, over an intermediate range of intensities, in the zero-viscosity limit.