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LES-CMC study of an excited hydrogen flame

机译：LES-CMC研究激发氢火焰

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摘要

The large eddy simulation/conditional moment closure approach has been used to study excited, attached and lifted flames in a stream of hot co-flow air. The excitation is obtained by adding a flapping forcing term with amplitude of 15% of fuel velocity and frequency corresponding to Strouhal numbers St = 0.175, 0.25, 0.325 to an inlet velocity profile. It is shown that such a type of forcing dramatically changes the global flame shape, resulting in a flame occupying very large volume or in bifurcating flames or even triple flames. We observed that the flame which is initially circular may transform downstream into a quasi-plane flame. The analysed cases include configurations with a small and large co-flow velocity. In the former case, the flame shape strongly depends on forcing frequency while in the latter substantial differences are seen only in an internal part of the flame. Both the lift-off heights of the flames and their spreading angles were found to be a function of the forcing frequency. The computational results are validated based on the solutions obtained for non-excited flames for which experimental data are available. The results obtained for various co-flow temperatures and velocities show that both auto-ignition times and lift-off heights are predicted correctly and exhibit trends observed experimentally. (C) 2015 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：大型涡流模拟/条件矩闭合方法已用于研究热同流空气流中的激发火焰，附着火焰和上升火焰。通过在进气口速度曲线上添加一个襟翼强迫项，该襟翼强迫项的幅度为燃料速度的15％，频率对应于斯特劳哈尔数St = 0.175、0.25、0.325。结果表明，这种强迫会显着改变整体火焰的形状，从而导致火焰占据非常大的体积或分叉的火焰甚至是三重火焰。我们观察到最初是圆形的火焰可能会向下游转化为准平面火焰。分析的情况包括同小和大的同流速度的配置。在前一种情况下，火焰形状在很大程度上取决于强迫频率，而在后一种情况下，仅在火焰的内部部分才看到明显的差异。发现火焰的抬升高度和它们的扩散角都是强迫频率的函数。计算结果是基于获得的非激发火焰的解决方案进行验证的，该实验的数据是可用的。在不同的同流温度和速度下获得的结果表明，自动点火时间和提离高度都可以正确预测，并显示出实验观察到的趋势。 （C）2015年燃烧研究所。由Elsevier Inc.出版。保留所有权利。

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  • 来源
    《Combustion and Flame》 |2015年第10期|3864-3883|共20页
  • 作者

    Tyliszczak Artur;

  • 作者单位

    Czestochowa Tech Univ, Fac Mech Engn & Comp Sci, Inst Thermal Machinery, Al Armii Krajowej 21, PL-42201 Czestochowa, Poland;

  • 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

    Flow control; Bifurcation phenomenon; Auto-ignition; Lifted flame;

    机译：流量控制;分叉现象;自燃;起火;

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