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Three-dimensional time-dependent numerical simulation of a quiescent carbon combustion in air

机译：空气中静态碳燃烧的三维时变数值模拟

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摘要

Seven carbon particle diameters, ranging from 0.006 to 16 mm; three air temperatures, varying from 1000 to 1800 K; four ambient air velocities, namely, 0, 0.5, 5, and 50m/s respectively, are selected to study carbon combustion numerically. Three-dimensional time-dependent numerical procedure is employed. The carbon particle is situated in the center of the computational domain and remained at rest. A uniform computational grid which is eight times larger than the original particle diameter in every coordinate axis is adopted. Three carbon combustion regimes, namely kinetic-controlled, kinetic-diffusion-controlled, and diffusion-controlled, are all observed. To analyze these carbon combustion regimes quantitatively, the kinetic-controlled carbon combustion is denned as that the minimum oxygen concentration at the carbon surface is greater than 90% of the ambient oxygen fraction solving with single-film model; the diffusion-controlled carbon combustion is defined as the minimum oxygen concentration on the carbon surface is less than 10% of the ambient oxygen fraction solving with sin gle-film model too. Other ranges are defined as kinetic-diffusion-controlled carbon combustion. Two quantitative curves, one is to distinguish the kinetic-controlled and kinetic-diffusion-controlled carbon combustion, the other is to distinguish the kinetic-diffusion-controlled and diffusion-controlled carbon combustion, are obtained. The carbon burn-off time is also studied in this paper; the results show that when carbon particle diameters are less than 0.24 mm and the corresponding air temperature is chose 1400 K, the carbon combustion regimes are closer to kinetic-controlled. Another discovery is that higher relative air velocity does not always give rise to less burn-off time.
机译：七个碳粒径，范围从0.006到16 mm；三个空气温度，范围从1000到1800 K；选择四种环境空气速度，分别为0、0.5、5和50m / s，以数字方式研究碳燃烧。采用三维时间相关的数值程序。碳粒子位于计算域的中心并保持静止。采用在每个坐标轴上均比原始粒径大八倍的统一计算网格。观察到三种碳燃烧方式，即动力学控制，动力学扩散控制和扩散控制。为了定量分析这些碳燃烧方式，动力学控制的碳燃烧被定义为碳表面的最小氧浓度大于单层膜模型求解的环境氧分数的90％。扩散控制的碳燃烧定义为碳表面上的最小氧浓度也小于用单层膜模型求解的环境氧分数的10％。其他范围定义为动力学扩散控制的碳燃烧。获得了两条定量曲线，一条是区分动力学控制和动力学扩散控制的碳燃烧，另一条是区分动力学扩散控制和扩散控制的碳燃烧。本文还研究了碳的燃烧时间。结果表明，当碳的粒径小于0.24 mm且相应的空气温度选择为1400 K时，碳的燃烧方式更接近动力学控制。另一个发现是，较高的相对风速并不总是会导致燃烧时间缩短。

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  • 来源
    《Fuel》 |2011年第4期|p.1522-1528|共7页
  • 作者

    Fuxing Yi; Jianren Fan; Debo Li; Shuqiang Lu; Kun Luo;

  • 作者单位

    State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, PR China;

    State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, PR China;

    State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, PR China;

    State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, PR China;

    State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, 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

    coal combustion; single-film model; double-film model; char combustion regimes;

    机译：燃煤单片模型;双层电影模型;炭燃烧方式;

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