Experimental study on flame pattern formation and combustion completeness in a radial microchannel
Experimental study on flame pattern formation and combustion completeness in a radial microchannel
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DOI：
10.1088/0960-1317/17/12/002
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发表时间：
2007-12
影响因子：
2.3
通讯作者：
A. Fan;S. Minaev;Sudarshan Kumar;Wei Liu;K. Maruta
中科院分区：
文献类型：
--
作者：
A. Fan;S. Minaev;Sudarshan Kumar;Wei Liu;K. Maruta
对直径为50 mm、间隙为2.0 mm的径向微通道内的燃烧特性进行了实验研究。为了模拟微尺度燃烧装置中的一个重要策略--热回流，通过外部热源沿微通道径向沿着流动方向施加正温度梯度。甲烷-空气混合物从顶板的中心通过4.0mm直径的输送管供应。在实验中观察到了多种火焰模式，包括稳定的圆形火焰和几种不稳定的火焰模式，称为不稳定的圆形火焰，单和双pelton状火焰，移动火焰和三重火焰。本文给出了所有这些火焰模式的状态图。研究了各种火焰模式的一些特性，如稳定和不稳定圆形火焰的半径、主要燃烧产物和燃烧效率。通过改变壁面温度水平，研究了热回流对燃烧稳定性的影响。
Combustion behavior in a radial microchannel with a gap of 2.0 mm and a diameter of 50 mm was experimentally investigated. In order to simulate the heat recirculation, which is an essential strategy in microscale combustion devices, positive temperature gradients along the radial flow direction were given to the microchannel by an external heat source. A methane–air mixture was supplied from the center of the top plate through a 4.0 mm diameter delivery tube. A variety of flame patterns, including a stable circular flame and several unstable flame patterns termed unstable circular flame, single and double pelton-like flames, traveling flame and triple flame, were observed in the experiments. The regime diagram of all these flame patterns is presented in this paper. Some characteristics of the various flame patterns, such as the radii of stable and unstable circular flames, major combustion products and combustion efficiencies of all these flame patterns, were also investigated. Furthermore, the effect of the heat recirculation on combustion stability was studied by changing the wall temperature levels.