基于点状火源的秸秆火焰蔓延及燃烧特性

杜伟; 程海涛; 邹彪; 任伟达; 朱晓康; 李聪

doi:10.16511/j.cnki.qhdxxb.2022.22.019

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清华大学学报（自然科学版） ›› 2022, Vol. 62 ›› Issue (6) : 1088-1093. DOI: 10.16511/j.cnki.qhdxxb.2022.22.019

专刊：公共安全

基于点状火源的秸秆火焰蔓延及燃烧特性

杜伟¹, 程海涛¹, 邹彪¹, 任伟达¹, 朱晓康¹, 李聪²

作者信息 +

Flame spread and combustion characteristics of straw bales from a point fire source

DU Wei¹, CHEN Haitao¹, ZOU Biao¹, REN Weida¹, ZHU Xiaokang¹, LI Cong²

Author information +

文章历史 +

摘要

该文开展了圆柱形堆积秸秆的燃烧实验，测量并研究了不同堆积直径和堆积厚度条件下秸秆火焰发展蔓延过程、火焰结构、秸秆质量损失以及火焰温度等，推导并建立了关于质量损失速率（ṁ）、无量纲火焰温度的定量模型。结果表明：秸秆燃烧过程中随着燃烧区域的扩大，火焰结构会依次出现中空的锥形火焰、分离的环形火焰以及断裂的环形火焰形态；秸秆质量损失速率呈现先增加后减少的趋势，其峰值与秸秆初始质量具有良好的线性关系，表明秸秆的初始质量越大越有助于燃烧过程的热量积累；火焰轴心温度也呈现先增大后减小的趋势，无量纲火焰温度与（z-z₀）ṁ^-2/5具有幂函数关系，随（z-z₀） ṁ^-2/5增加呈现不同斜率的线性下降趋势，其中z-z₀为火焰相对高度。该研究结论有助于加深对秸秆火灾发展蔓延过程的认识。

Abstract

Combustion experiments were conducted with cylindrical straw bales with various diameters and thicknesses. The flame spread and flame structure were analyzed with a model developed to predict the mass loss rate (ṁ) and flame temperature. The flame structure progresses from a hollow conical flame to a separated annular flame and then a broken annular flame. The mass loss rate first increases and then slowly decreases. The peak mass loss rate is linearly related to the initial straw mass, which implies that a larger initial mass increases the heat accumulation during the straw combustion. The flame temperature distribution along the vertical axis has the same trend as the mass loss rate with the dimensionless flame temperature decreasing slowly with increasing (z-z₀)ṁ^-2/5 for small values of this parameter and then decreasing more quickly at larger values of (z-z₀)ṁ^-2/5. (z-z₀ is the relative flame height.) The conclusions deepen the understanding of straw fire development and spread characteristics.

导出引用

杜伟, 程海涛, 邹彪, 任伟达, 朱晓康, 李聪. 基于点状火源的秸秆火焰蔓延及燃烧特性[J]. 清华大学学报（自然科学版）. 2022, 62(6): 1088-1093 https://doi.org/10.16511/j.cnki.qhdxxb.2022.22.019

DU Wei, CHEN Haitao, ZOU Biao, REN Weida, ZHU Xiaokang, LI Cong. Flame spread and combustion characteristics of straw bales from a point fire source[J]. Journal of Tsinghua University(Science and Technology). 2022, 62(6): 1088-1093 https://doi.org/10.16511/j.cnki.qhdxxb.2022.22.019

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基金

国网通用航空有限公司科技项目（1100/2021-44003B）；国家自然科学基金联合基金项目（U2033206）；国家重点研发计划项目（2018YFC0809500）；中央高校基本科研业务经费项目（2020XJAQ02）

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收稿日期	出版日期
2021-12-28	2022-06-15
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2022-05-06

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