Arrangement of Flame Structure by Reaction Progress Variable and Its Gradient in Unsteady Counterflow Premixed Flame
Arrangement of Flame Structure by Reaction Progress Variable and Its Gradient in Unsteady Counterflow Premixed Flame
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非定常逆流预混火焰中反应进程变量及其梯度对火焰结构的排列
DOI：
10.1299/kikaib.72.208
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Kazuhiro Yamamoto
中科院分区：
文献类型：
--
作者：
N. Hayashi;H. Yamashita;Y. Nakamura;Kazuhiro Yamamoto
采用详细的化学动力学模型，对甲烷/空气逆流预混火焰非定常火焰结构的主要参数进行了数值模拟研究。用两种边界条件比较了反相气体的差异。一种是双逆流预混火焰，从两个喷嘴喷出预混气体；另一种是单逆流预混火焰，对抗气体和空气的预混。为了研究非定常火焰行为，在喷口速度上加入了正弦波动。研究了平均速度和喷射速度波动频率对火焰结构的影响。结果表明，单火焰中的火焰结构受反应过程变量的控制，该变量由氧的质量分数Co， q和火焰前的梯度∇Co， q定义。在双火焰中，∇Co， q和以火焰前缘温度定义的过程变量的梯度，∇Cr， q主导火焰结构。
Dominant parameters in unsteady flame structure of methane/air counterflow premixed flame are investigated by numerical simulation with detailed chemical kinetics model. Two boundary conditions are used for comparison of the difference in the countered gas. One is the twin counterflow premixed flames, which is spouted premixed gas from both nozzles, and the other is the single counterflow premixed flame countered premixed gas and air. In order to investigate unsteady flame behavior, a sinusoidal fluctuation is added to the spout velocity. The influences of average velocity and the fluctuation frequency of the spout velocity on flame structure are examined. It is shown that the flame structure in the single-flame is governed by a reaction progress variable defined with mass fraction of oxygen, Co, q, and its gradient, ∇Co, q evaluated at flame front. In the twin-flame, ∇Co, q and the gradient of a progress variable defined with temperature evaluated at flame front, ∇Cr, q, dominate the flame structure.