Are Sooting Premixed Porous-Plug Burner Flames One-Dimensional? A Laser-Based Experimental Investigation
Are Sooting Premixed Porous-Plug Burner Flames One-Dimensional? A Laser-Based Experimental Investigation
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DOI：
10.1080/00102202.2012.718006
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发表时间：
2013-02
影响因子：
1.9
通讯作者：
Nils-Erik Olofsson;H. Bladh;A. Bohlin;J. Johnsson;P. Bengtsson
中科院分区：
文献类型：
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作者：
Nils-Erik Olofsson;H. Bladh;A. Bohlin;J. Johnsson;P. Bengtsson
研究了炭黑预混多孔塞（McKenna）燃烧器火焰的一维特性，其动机是最近的研究，其中一维性受到质疑。检查采用激光诊断技术来测量不同的特性：温度使用旋转相干反斯托克斯拉曼光谱（汽车）和煤烟性质使用激光诱导白炽和弹性光散射。特别注意了氮气或空气的外部保护气流的影响。氮气保护气体导致外边缘处的火焰冷却，而空气保护气体通过CO/H2/烟灰的氧化导致加热。这通常导致氮护罩火焰的更不均匀的空间颗粒尺寸分布，在火焰边缘处具有更小的颗粒尺寸。目前的研究结果强调，需要准确地表征燃烧器和操作条件，而且，关于参数，乍一看似乎不太相关，如护罩气体，提供有用的数据，实验室之间的比较。
The one-dimensional character of sooting premixed porous-plug (McKenna) burner flames has been examined, motivated by recent investigations where the one-dimensionality has been questioned. The examination employs laser diagnostic techniques to measure different characteristics: temperature using rotational coherent anti-Stokes Raman spectroscopy (CARS) and soot properties using laser-induced incandescence and elastic light scattering. Special attention has been paid to the influence of an outer shroud gas flow of either nitrogen or air. The nitrogen shroud gas leads to flame cooling at the outer edge, whereas the air shroud results in heating through the oxidation of CO/H2/soot. This generally results in a more inhomogeneous spatial particle size profile for the nitrogen shroud flame, with smaller particle sizes at the flame edge. The present results emphasize the need to characterize burner and operating conditions accurately, and also, regarding parameters that at first glance seem less relevant, such as the shroud gas, to provide useful data for comparison between laboratories.