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首页> 美国卫生研究院文献>Royal Society Open Science >An experimental study on coflow diffusion combustion in a pellet-packed bed with different bed lengths
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An experimental study on coflow diffusion combustion in a pellet-packed bed with different bed lengths

机译：不同床长的颗粒填充床中同流扩散燃烧的实验研究

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摘要

In experimental investigations on axial symmetry, over-ventilated CH4/air diffusion combustion in a packed bed is executed to study the height, shape and stability of the flame. The combustor is a quartz tube packed with alumina pellets in which a cylindrical fuel stream is surrounded by a coflow air nozzle. The results show that the bed length and pellet diameter have a significant influence on the flame properties. In general, the flame above the pellet surface has axial symmetry, and its shape and colour are similar to those of a conventional diffusion flame when the bed length is smaller. The colour of the flame front varies with the bed length. The changed colour indicates an increased flame front temperature and that the combustion regime above the bed surface may change from non-premixed combustion to partially premixed combustion or even premixed combustion owing to the mix and dispersion effect in the packed bed. In addition, multiple flame behaviours, such as an inclined flame front, isolated reaction zone and oscillatory motion followed by a pulsating sound with a few hertz in a packed bed, are observed experimentally. The possible reasons for these phenomena are discussed.
机译：在轴向对称性的实验研究中，对填充床中过度通风的CH4 /空气扩散燃烧进行了研究，以研究火焰的高度，形状和稳定性。燃烧器是装有氧化铝球的石英管，其中圆柱形燃料流被同向空气喷嘴包围。结果表明，床长和颗粒直径对火焰性能有重要影响。通常，粒料表面上方的火焰具有轴向对称性，并且当床的长度较小时，其形状和颜色与常规扩散火焰的形状和颜色相似。火焰前沿的颜色随床的长度而变化。颜色的变化表示火焰前沿温度升高，并且由于在填充床中的混合和分散作用，床表面上方的燃烧方式可能会从非预混合燃烧变为部分预混合燃烧，甚至预混合燃烧。此外，实验观察到了多种火焰行为，例如倾斜的火焰锋，孤立的反应区和振荡运动，随后在填充床中出现了几赫兹的脉动声。讨论了这些现象的可能原因。

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