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首页> 外文期刊>Clean air >FLAMMABILITY CHARACTERISTICS OF THE ROD-STABILIZED LAMINAR PREMIXED FLAME
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FLAMMABILITY CHARACTERISTICS OF THE ROD-STABILIZED LAMINAR PREMIXED FLAME

机译：杆稳定层流预混合火焰的易燃性

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摘要

A premixed flame can be stabilized by an axially mounted rod introduced into the gas flow, creating an inverted, partially inverted, or regular (Bunsen) flame. Such a setup has been used in the present study to obtain experimentally the characteristic regions of flame stability for low Reynolds numbers (<3600) of a butane/air flame. The results confirm three different shapes of the stable flame: a regular (Bunsen) type for very fuel-rich mixtures and inverted and partially inverted types for stoichiometric and fuel-lean mixtures, respectively. At specific regions, either inverted or partially inverted flames can exist, primarily in dependence on axial distance and radial direction of the ignition source. The blow-off limits show that the convex shape of the inverted flame represents less interaction with the surrounding air, thus enabling the burner to operate at very fuel-lean mixtures. The flashback region has an elongated unstable area, where the flame slowly travels upstream due to reduced quenching effect, which is caused by heat conduction to the rod from the flame.
机译：预混火焰可以通过引入气流中的轴向安装杆来稳定，从而产生倒立，部分倒立或规则（本森）火焰。在本研究中已使用这种设置来通过实验获得丁烷/空气火焰的低雷诺数（<3600）的火焰稳定性特征区域。结果证实了稳定火焰的三种不同形状：分别用于非常富燃料的混合物的常规（本森）型和用于化学计量比和贫燃料的混合物的倒置和部分倒置的类型。在特定区域，主要取决于点火源的轴向距离和径向方向，可以存在倒置或部分倒置的火焰。放气极限表明，倒置火焰的凸形代表与周围空气的相互作用较小，因此使燃烧器能够在非常贫燃料的混合物下运行。闪回区域具有细长的不稳定区域，在该区域中，由于淬火效果减弱而使火焰缓慢地向上游移动，这是由于火焰对火焰的热传导所致。

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  • 来源
    《Clean air》 |2007年第2期|171-182|共12页
  • 作者

    M. DRKOS; C. W. LEUNG; C. S. CHEUNG;

  • 作者单位

    Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China;

    Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China;

    Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China;

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  • 正文语种 eng
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  • 关键词

    inverted premixed flame; partially inverted; rod stabilization; flame stability;

    机译：倒置的预混火焰;部分倒置杆稳定火焰稳定性;

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