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首页> 外文期刊>Fuel >Cellular instabilities of non-adiabatic laminar flat methane/hydrogen oxy-fuel flames highly diluted with CO_2
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Cellular instabilities of non-adiabatic laminar flat methane/hydrogen oxy-fuel flames highly diluted with CO_2

机译：用CO_2高度稀释的非绝热层状扁平甲烷/氢氧燃料火焰的细胞不稳定性

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摘要

Cellular instability of non-adiabatic laminar premixed flat methane/hydrogen oxy-fuel flames highly diluted with CO_2 was studied systematically. The CH_4/H_2/CO_2/O_2 flames were stabilized on a McKenna burner at atmospheric pressure. The CH_4/H_2/CO_2/O_2 flames with varied equivalence ratios and hydrogen mole fractions were investigated. Quantitative structure parameters of the cellular flame fronts were obtained with OH-PLIF technique. On the basis of experimental results, theoretical analysis was made to clarify the effect of mixture properties and heat loss on flame cellular instability. Results showed that cellular flame structure appeared near the lean limit combustion condition. Cell number of flame and its hydrodynamic factor, ω_(DL), present a positive correlation. The average stand-off distance, L, is well identified to characterize the cellular flames. Average cell amplitude, A, and wavelength, λ, increased with the increase of L. A good indicator of instability level, A·λ, was defined. The RS model was used in a linear stability analysis, and the onset of cellular flames was found to be governed by both hydrodynamic and thermal-diffusive instability mechanisms, while the heat loss made the flame more stable. The RS model is not an appropriate model to predict critical wavenumber for the non-adiabatic flame.
机译：系统研究了用CO_2高度稀释的非绝热层流预混扁平甲烷/氢氧燃料火焰的细胞不稳定性。 CH_4 / H_2 / CO_2 / O_2火焰在麦克肯纳燃烧器上稳定在大气压下。研究了不同当量比和氢摩尔分数的CH_4 / H_2 / CO_2 / O_2火焰。用OH-PLIF技术获得了蜂窝状火焰锋的定量结构参数。在实验结果的基础上，进行了理论分析，以弄清混合性能和热损失对火焰孔稳定性的影响。结果表明，在稀薄极限燃烧条件附近出现了蜂窝状火焰结构。火焰的泡孔数及其流体力学因子ω_（DL）呈正相关。可以很好地确定平均间隔距离L，以表征蜂窝状火焰。平均细胞振幅A和波长λ随L的增加而增加。定义了一个很好的不稳定度指标A·λ。 RS模型用于线性稳定性分析，发现细胞火焰的发生受流体动力和热扩散不稳定性机制的控制，而热量损失使火焰更加稳定。 RS模型不是预测非绝热火焰临界波数的合适模型。

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  • 来源
    《Fuel》 |2015年第1期|38-46|共9页
  • 作者

    Wu Jin; Jinhua Wang; Senbin Yu; Yaohui Nie; Yongliang Xie; Zuohua Huang;

  • 作者单位

    State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, PR China;

    State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, PR China;

    State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, PR China;

    State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, PR China;

    State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, PR China;

    State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, PR China;

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

    Cellular instability; Oxy-fuel flame; McKenna burner; OH-PLIF; Stand-off distance;

    机译：细胞不稳定含氧燃料火焰;麦肯纳燃烧器;OH-PLIF;隔离距离;

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