Regime diagrams and characteristics of flame patterns in radial microchannels with temperature gradients
Regime diagrams and characteristics of flame patterns in radial microchannels with temperature gradients
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DOI：
10.1016/j.combustflame.2007.10.015
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发表时间：
2008-05
影响因子：
4.4
通讯作者：
A. Fan;S. Minaev;Sudarshan Kumar;Wei Liu;K. Maruta
中科院分区：
文献类型：
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作者：
A. Fan;S. Minaev;Sudarshan Kumar;Wei Liu;K. Maruta
根据实验结果，绘制了具有温度梯度的径向微通道内火焰斑图形成的综合状态图。在由两个平行的圆形石英板形成的微通道的中心处引入预混合的甲烷-空气混合物，所述石英板用外部多孔燃烧器加热以在流动方向上产生正温度梯度条件。在这些微通道的通道宽度为0.5，1.0，1.5，2.0，2.5，和3.0毫米的燃烧行为进行了实验研究。获得了各种稳定和不稳定火焰模式的状态图，证实了火焰模式是混合物当量比、入口混合物速度和通道宽度的强函数。此外，还研究了单、三重火焰的旋转频率、稳定圆形火焰阵面的半径以及单、双冲击式火焰主要燃烧产物的比较等燃烧特性。
Comprehensive regime diagrams of flame pattern formation in radial microchannels with temperature gradients were drawn based on experimental findings. A premixed methane–air mixture was introduced at the center of microchannels formed by two parallel circular quartz plates that were heated with an external porous burner to create a positive temperature gradient condition in the direction of flow. Combustion behavior in those microchannels at channel widths of 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0 mm were experimentally investigated. Regime diagrams of various stable and unstable flame patterns were obtained, confirming that the flame pattern is a strong function of mixture equivalence ratio, inlet mixture velocity, and channel width. Furthermore, some combustion characteristics, such as the rotating frequency of the single pelton-like flame and the triple flame, the radius of the stable circular flame front, and comparison between the major combustion products of the single and double pelton-like flames, were also investigated.