On the structure and extinction of interacting lean methane/air premixed flames
On the structure and extinction of interacting lean methane/air premixed flames
复制标题
相互作用的贫甲烷/空气预混火焰的结构和熄灭
DOI：
10.1016/0010-2180(94)90199-6
复制
发表时间：
1994
影响因子：
4.4
通讯作者：
S. Chung
中科院分区：
文献类型：
--
作者：
S. D. Lee;S. Chung
采用28种组分74步反应的化学模型，对甲烷/空气稀薄预混火焰进行了数值模拟，研究了两个不同强度的预混火焰在逆流中的相互作用。采用有限差分法、时间积分法和修正牛顿迭代法，并采用自适应网格技术和网格平滑技术，根据解剖面的空间陡度来调整网格系统。甲烷预混火焰的火焰结构由自由基截断层、甲烷分解放热主层、自由基分支层和氢与一氧化碳氧化层组成。两种模式的火焰相互作用，强和弱的相互作用取决于火焰强度的差异，以及它们各自的行为被识别。研究发现，在弱相互作用区和强相互作用区，热损失和不完全反应分别是导致火焰熄灭的原因。计算的消光边界与实验结果符合得很好。
Lean methane/air premixed flames are studied numerically, using a detailed chemical model of 74 reaction steps with 28 species, to investigate the flame interaction between two stretched premixed flames with unequal intensities in a counterflow. The finite difference method, time integration and modified Newton iteration are used, and adaptive grid technique and grid smoothing have been employed to adjust the grid system according to the spatial steepness of the solution profiles. The flame structure of the methane premixed flames has four layers, consisting of the radical cutoff layer, the main heat release layer of the methane decomposition, the radical branching layer and the hydrogen and carbon monoxide oxidation layer. Two modes of flame interaction, the strong and weak interactions depending on the differences in the flame intensities, and their respective behaviors are identified. It has been found that heat loss and incomplete reaction are responsible for the flame extinctions in the weak and strong interaction regimes, respectively. The calculated extinction boundaries are in good agreement with the experimental results.