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首页> 外文期刊>Combustion and Flame >Laminar round jet diffusion flame buoyant instabilities: Study on the disappearance of varicose structures at ultra-low Froude number
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Laminar round jet diffusion flame buoyant instabilities: Study on the disappearance of varicose structures at ultra-low Froude number

机译:层流射流扩散火焰浮力的不稳定性:超低弗洛德数下曲张结构消失的研究

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摘要

At very low Froude number, buoyancy instabilities of round laminar jet diffusion flames disappear (except for small tip oscillations referred to as flickering) and those flames look stable and smooth. This study examines the contributions of the different phenomena in the flow dynamics that may explain this effect. It is observed that, at ultra-low Froude/Reynolds numbers, the material influenced by buoyancy is the plume of the flame and not the flame itself (reaction zone) that is short. Therefore, the vorticity creation zone does not profit from the reaction neighbourhood promoting a sharp gradient of density. Expansion and stretch are also important as they push vorticity creation terms more inside the flame and closer to the burner rim compared to moderate Froude flames. In these latter, the vorticity is continuously created around the flame reaction zone, along its developed height and closer to the vertical direction (in average).
机译:在非常低的弗洛德数下,圆形层状射流扩散火焰的浮力不稳定性消失了(除了称为闪烁的小尖端振荡之外),这些火焰看起来稳定且光滑。这项研究检查了流动现象中不同现象的贡献,这些现象可以解释这种影响。可以看出,在超低弗洛德/雷诺数下,受浮力影响的材料是火焰的羽状流,而不是短的火焰本身(反应区)。因此,涡度产生区不能从促进密度的急剧梯度的反应邻域中获利。膨胀和拉伸也很重要,因为与中等Froude火焰相比,它们使火焰内部的涡旋形成术语更多,并且更靠近燃烧器边缘。在后者中,围绕火焰反应区,沿着其展开的高度并更靠近垂直方向(平均),连续地产生涡旋。

著录项

  • 来源
    《Combustion and Flame》 |2010年第4期|757-768|共12页
  • 作者

    Joan Boulanger;

  • 作者单位

    Gas Turbine Laboratory, Institute for Aerospace Research, Ottawa, Ontario, Canada Gas Turbine Laboratory, Building M-10, Institute for Aerospace Research, National Research Council, Ottawa, Ontario, Canada K1A 0R6;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    buoyancy instabilities; varicose; jet diffusion flame;

    机译:浮力不稳定静脉曲张射流扩散火焰;

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