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Numerical study on opposed-flow flame spread over discrete fuels - The influence of gap size and opposed-flow velocity

机译：离散燃料相对流动火焰的数值研究 - 间隙尺寸和抗速流速的影响

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摘要

Flame spread over solid fuel is a common phenomenon in fire scenes. This work looks into the relationship between the flame spread and the gap length between fuel beds at different opposed-flow velocities. An unsteady numerical model is developed to study the opposed-flow flame spread over discrete fuels. The influence of the gap size between the discrete fuels and the opposed-flow velocity on the opposed-flow flame spread is investigated, and the results are validated with an analytical model. The characteristics of solid burning, gas fuel and flame spread rates are examined. The results of temperature and gas fuel distribution show that the heat transfer from the flame to the discrete fuels decreases as the gap size increase. The pyrolysis front lags behind the leading position of gas thermal structure because the discrete fuels behind the flame front can provide fuel gas to the flame front by diffusion for combustion. The mass diffusion plays a significant role in the flame spread across the gaps. The average flame spread rate increase first and then decreases with the increase of gap size, because of the competition mechanism between the flame jump effect and the heat transfer. Besides, the flame cannot spread across to the next discrete fuel if the gap size increases to a critical value. The analytical and numerical results showed that the critical gap size is proportional to the reciprocal of opposed-flow. This work should be significant to predict the fire growth of discrete fuels and its potential hazards.
机译：火焰在固体燃料上传播是火灾场景中的常见现象。这项工作展望了燃料铺在不同的相反流速下燃料床之间的间隙长度之间的关系。开发了一个不稳定的数值模型，以研究相反流量的火焰传播离散燃料。研究了间隙尺寸与离散燃料之间的间隙尺寸对相反流量火焰扩散的影响，结果用分析模型验证。检查了固体燃烧，气体燃料和火焰蔓延率的特性。温度和气体燃料分布的结果表明，随着间隙尺寸的增加，从火焰到离散燃料的热传递减小。热解前部滞后在气体热结构的前导位置，因为火焰前面背后的离散燃料可以通过扩散来为火焰前导提供燃料气体。质量扩散在跨越间隙的火焰中起着重要作用。由于火焰跳跃效果和热传递之间的竞争机制，平均火焰扩散率先增加，然后随着差距尺寸的增加而降低。此外，如果间隙尺寸增加到临界值，则火焰不能划分到下一个离散燃料。分析和数值结果表明，临界间隙尺寸与相反流动的往复式成比例。这项工作应该是预测离散燃料的火灾生长及其潜在危害的重要性。

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  • 来源
    《Fuel》 |2021年第1期|118862.1-118862.8|共8页
  • 作者

    Luo Shengfeng; Zhao Yanli; Zhang Hui;

  • 作者单位

    Tsinghua Univ Dept Engn Phys Beijing 100084 Peoples R China;

    Xian Univ Sci & Technol Coll Safety Sci & Engn Xian 710054 Shaanxi Peoples R China;

    Tsinghua Univ Dept Engn Phys Beijing 100084 Peoples R 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

    Numerical model; Opposed-flow; Discrete fuel; Flame spread rate;

    机译：数值模型;相反流动;离散燃料;火焰传播率;

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