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首页> 外文期刊>International Journal of Heat and Mass Transfer >Modeling of quasi-steady sodium droplet combustion in convective environment
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Modeling of quasi-steady sodium droplet combustion in convective environment

机译：对流环境中准稳态钠滴燃烧的建模

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摘要

In the event of accidental leakage of sodium from the systems of a Liquid Metal Fast Breeder Reactor (LMFBR), a spray of liquid sodium droplets may be formed which will burn by reacting with the surrounding atmospheric oxygen. In order to understand the burning characteristics of the complete spray, combustion of an individual sodium droplet forms the basis and this has been investigated in the present study. A comprehensive numerical model has been developed to analyze the isolated sodium droplet combustion in a mixed convective environment. The governing equations for mass, momentum, species and energy conservation have been solved in axisymmetric cylindrical coordinates using the Finite Volume Method (FVM). Finite rate kinetic mechanisms have been incorporated to simulate droplet burning, using available kinetics data for basic sodium oxidation reactions. Salient features of the numerical model include a global single-step reaction for sodium oxidation in air and the incorporation of property variations with temperature and concentration. An equilibrium mixture of sodium peroxide, sodium monoxide and sodium vapor is considered as the final reaction product, taking into account the effects of dissociation reactions. The numerical model has been validated with experimental results available in literature. Results for the fuel mass burning rates and flame shapes are presented for different sizes of droplets burning under different free-stream conditions. The model predicts the occurrence of envelope flame around a sodium droplet even at fairly high free-stream velocities.
机译：如果钠从液态金属快中子增殖反应器（LMFBR）的系统中意外泄漏，则可能会形成液态钠滴喷雾，该钠滴会与周围的大气氧反应而燃烧。为了理解整个喷雾的燃烧特性，单个钠滴的燃烧形成了基础，并且在本研究中对此进行了研究。已经开发了一个综合的数值模型来分析混合对流环境中孤立的钠滴燃烧。使用有限体积法（FVM）在轴对称圆柱坐标系中求解了质量，动量，物质和能量守恒的控制方程。使用基本钠氧化反应的可用动力学数据，采用有限速率动力学机制来模拟液滴燃烧。数值模型的显着特征包括空气中钠氧化的全局单步反应以及随温度和浓度变化的特性变化。考虑到解离反应的影响，将过氧化钠，一氧化钠和钠蒸气的平衡混合物视为最终反应产物。数值模型已经用文献中提供的实验结果进行了验证。给出了在不同的自由流条件下燃烧不同大小的液滴的燃料质量燃烧速率和火焰形状的结果。该模型预测即使在相当高的自由流速度下，在钠滴周围也会出现包络火焰。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2012年第4期|p.734-743|共10页
  • 作者

    P. Mangarjuna Rao; V. Raghavan; K. Velusamy; T. Sundararajan; U.S.P. Shet;

  • 作者单位

    Indira Gandhi Center for Atomic Research, Department of Atomic Energy, Katpakkam 603 102, India;

    Thermodynamics and Combustion Engineering Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600 036, India;

    Indira Gandhi Center for Atomic Research, Department of Atomic Energy, Katpakkam 603 102, India;

    Thermodynamics and Combustion Engineering Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600 036, India;

    Thermodynamics and Combustion Engineering Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600 036, India;

  • 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

    LMFBR; sodium droplet; droplet combustion; flame shape; flame stand-off distance; d~2-law; burning rate constant;

    机译：LMFBR;钠滴;液滴燃烧;火焰形状;火焰稳定距离;d〜2-律;燃烧速率常数;

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