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Experimental and computational investigation of partially-premixed methoxymethane flames

机译：部分预混合甲氧基甲烷火焰的实验和计算研究

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摘要

Experimental and computational studies are carried out to elucidate the structure and extinction of laminar partially-premixed flames employing the counterflow configuration. The fuel is methoxymethane (DME). The formulation considers two laminar streams that flow toward a stagnation plane. One stream called the fuel-rich stream is made up of DME (CH3OCH3), and nitrogen (N2) with small amounts of oxygen (O2) and the other stream called the fuel-lean stream is made up of O2, and N2with small amounts of CH3OCH3. The level of partial premixing is characterized by the equivalence ratio defined as the ratio of the mass of methoxymethane to the mass of oxygen normalized by the corresponding stoichiometric value of this ratio. The equivalence ratio of the fuel-rich stream isϕrand that of the fuel-lean stream isϕl. Previous studies have established that the scalar dissipation rate at extinction depends on the stoichiometric mixture fraction,ξst, and the adiabatic flame temperature,Tst. To clarify the chemical influences of partial premixing on extinction, studies are carried at fixed values ofξstandTstand for various values ofϕlandϕr. Use of this procedure separates the chemical influences from thermal effects. A previously developed Burke–Schumann (flame-sheet) formulation is employed to estimate the boundary values of the mass fractions of the reactants. Two sets of experiments are conducted, in one setϕr−1=0,and measurements are made for various selected values ofϕl, in the other setϕl=0and measurements are made for various selected values ofϕr. The computations are carried out using the San Diego mechanism that was recently updated to include kinetic steps describing combustion of methoxymethane. For DME addition to the fuel-lean stream, experiments and predictions show that the value of the strain rate at extinction, increases with increasingϕl. For O2addition to the fuel-rich stream, experiments and predictions show very little changes in the values of the strain rate at extinction with increasingϕr−1. The key observation is that addition of DME to the fuel-lean stream enhances the overall reactivity while addition of oxygen to the fuel-rich stream has little influence on the overall reactivity.
机译：进行了实验和计算研究，以阐明采用逆流构造的层状部分预混火焰的结构和熄灭。燃料是甲氧基甲烷（DME）。该公式考虑了两个流向停滞平面的层流。一种流称为富燃料流由DME（CH3OCH3）和氮气（N2）以及少量氧气（O2）组成，另一种流称为贫燃料流由O2和少量N2组成CH3OCH3。部分预混合的水平由当量比表征，当量比定义为甲氧基甲烷质量与氧质量的比值，该比值由该比率的相应化学计量值归一化。富燃料流的当量比等于贫燃料流的当量比等于1。先前的研究已经确定，消光时的标量耗散率取决于化学计量的混合比ξst和绝热火焰温度Tst。为了弄清部分预混对消光的化学影响，在固定的ξstandTstand值下对各种landr值进行了研究。使用此程序可将化学影响与热影响分开。先前开发的Burke-Schumann（火焰表）配方用于估算反应物质量分数的边界值。进行两组实验，其中一组ϕr-1 = 0，并且针对variousl的各种选择值进行测量，在另一组ϕl = 0中，并且针对ϕr的各种选择值进行测量。使用最近更新的圣地亚哥机制进行计算，包括描述甲氧基甲烷燃烧的动力学步骤。对于添加到贫燃料流中的二甲醚，实验和预测表明，消光时应变率的值随l的增加而增加。对于富氧流中的氧气添加，实验和预测表明，消光时应变率值随ϕr-1的增加而变化很小。关键的观察结果是，将DME添加到贫燃料流中可增强总体反应性，而将氧气添加到富燃料流中对总体反应性几乎没有影响。

著录项

  • 来源
    《Combustion and Flame》 |2018年第9期|99-104|共6页
  • 作者

    Yuanjie Jiang; Ryan Gehmlich; Thomas Knoblinger; Kalyanasundaram Seshadri;

  • 作者单位

    Department of Mechanical and Aerospace Engineering, University of California at San Diego;

    Department of Mechanical and Aerospace Engineering, University of California at San Diego;

    Department of Mechanical and Aerospace Engineering, University of California at San Diego;

    Department of Mechanical and Aerospace Engineering, University of California at San Diego;

  • 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

    Methoxymethane flames; Partially-premixed; Flame structure; Extinction;

    机译：甲氧基甲烷火焰;部分预混;火焰结构;消光;

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