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Effect of Fuel Bed Width on Upslope Fire Spread: An Experimental Study

机译:燃料床宽度对上坡火扩散的影响:实验研究

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摘要

In this work, a series of experiments across a porous fuel bed of pine excelsior with two sidewalls were conducted under different slope and fuel bed width conditions. It was observed that the fire line stayed straight during fire spread after the initial line ignition for all tests. Flame length and rate of spread (ROS) increased with increasing slope angle or fuel bed width. A dimensionless correlation of ROS was developed that integrated the effects of slope and fuel bed width. For a lower slope angle (= 20 degrees in this work), the reverse airflow that denoted natural convective cooling for unburnt fuel was identified from the measured flow velocity data, for which flame radiation was the dominant preheating mechanism. For a higher slope angle (30 degrees in this work), it was identified that the forward airflow from the burning area induced convective heating ahead of the flame front, and thus the fuel preheating was controlled by both flame radiation and convective heating. The effect of convective heating was more significant under larger fuel bed widths.
机译:在这项工作中,在不同的斜坡和燃料床宽度条件下进行了一系列具有两个侧壁的松树型燃油床的一系列实验。据观察,火线在火灾初始点火后的初始线路以进行所有测试的初始点火过程中留下直线。随着坡度或燃料床宽度的增加,火焰长度和扩散速率(ROS)增加。 ROS的无量纲相关性是开发的,综合坡度和燃料床宽度的影响。对于较低的倾斜角度(在该工作中& = 20度),从测量的流速数据中鉴定了表示未燃烧燃料的自然对流冷却的反向气流,其中火焰辐射是显性预热机制。对于更高的倾斜角度(在该工作中30度),鉴定出来自燃烧区域的前向气流引起火焰前部的对流加热,因此通过火焰辐射和对流加热来控制燃料预热。在较大的燃料床宽度下,对流加热的影响更大。

著录项

  • 来源
    《Fire Technology》 |2021年第3期|1063-1076|共14页
  • 作者单位

    Univ Sci & Technol China State Key Lab Fire Sci Hefei 230026 Anhui Peoples R China;

    Univ Sci & Technol China State Key Lab Fire Sci Hefei 230026 Anhui Peoples R China;

    Univ Sci & Technol China State Key Lab Fire Sci Hefei 230026 Anhui Peoples R China;

    Univ Sci & Technol China State Key Lab Fire Sci Hefei 230026 Anhui Peoples R China;

    Univ Sci & Technol China State Key Lab Fire Sci Hefei 230026 Anhui Peoples R China;

    Univ Sci & Technol China State Key Lab Fire Sci Hefei 230026 Anhui Peoples R China;

    Univ Coimbra Dept Mech Engn P-3030788 Coimbra Portugal;

  • 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

    Fuel bed width; Slope; Rate of spread; Flame radiation; Convective heating;

    机译:燃料床宽度;斜坡;传播率;火焰辐射;对流加热;

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