不同倾斜角度和材料宽度下PMMA火蔓延加速行为研究

doi:10.16265/j.cnki.issn1003-3033.2026.07.0811

中国安全科学学报 ›› 2026, Vol. 36 ›› Issue (7): 53-59.doi: 10.16265/j.cnki.issn1003-3033.2026.07.0811

不同倾斜角度和材料宽度下PMMA火蔓延加速行为研究

范传刚¹(), 饶冠杰¹, 卜蓉伟²^,^**()

¹ 中南大学土木工程学院, 湖南长沙 410075
² 长沙理工大学交通学院, 湖南长沙 410114

收稿日期:2026-03-20 修回日期:2026-05-26 出版日期:2026-07-28
通信作者:
^**卜蓉伟(1995—),男,山西吕梁人,博士,讲师,主要从事交通基础设施火灾机制及控制方法方面的研究。E-mail:rongweibu@csust.edu.cn。
作者简介:
范传刚 (1988—),男,山东济南人,博士,教授,主要从事受限空间火灾动力学、固/液体燃烧与蔓延等方面的研究。E-mail:chuangang.fan@csu.edu.cn。
基金资助:
国家自然科学基金资助(52504201); 湖南省自然科学基金资助(2025JJ60366); 湖南省自然科学基金资助(2024JJ2075); 道路灾变防治及交通安全教育部工程研究中心开放课题项目(kfj2403)

Study on accelerated flame spread behavior over PMMA plates under different inclination angles and material widths

Fan Chuangang¹(), Rao Guanjie¹, Bu Rongwei²^,^**()

¹ School of Civil Engineering, Central South University, Changsha Hunan 410075, China
² School of Transportation, Changsha University of Science & Technology, Changsha Hunan 410114, China

Received:2026-03-20 Revised:2026-05-26 Published:2026-07-28

摘要/Abstract

摘要：

为揭示倾斜角度θ与材料宽度W对固体火蔓延加速行为的影响,以聚甲基丙烯酸甲酯(PMMA)为研究对象,通过设计不同θ(0~45°)和W(25~150 mm)的对照试验,探究固体火蔓延的加速临界条件。结果表明:火焰长度随θ和W的增加呈逐渐增长趋势。无量纲火蔓延速度与sinθ呈良好的指数关系,所建立的半经验模型可表征θ与W的耦合作用。随着θ和W的增加,火蔓延逐渐由稳定蔓延转向加速蔓延,且在火蔓延加速条件下临界Θ值趋近于1。质量损失速率与燃烧区特征长度间存在幂律关系,其幂指数随θ的增加而先增后降,传热主导模式由辐射主导过渡为对流主导。

关键词: 倾斜角度, 材料宽度, 火蔓延速度, 聚甲基丙烯酸甲酯(PMMA), 加速蔓延, 质量损失速率

Abstract:

To reveal the effects of inclination angle (θ) and material width (W) on the acceleration behavior of solid flame spread, this study investigated the critical conditions for acceleration in solid flame spread using PMMA plates as fuel samples. Controlled experiments were designed with varying θ (0-45°) and W (25-150 mm). The results demonstrate that flame length progressively increases with both θ and W. The dimensionless flame spread rate exhibits a good exponential relationship with sinθ, and the proposed semi-empirical model can characterize the coupled effects of θ and W. The study reveals that flame spread transitions from a stable regime to an accelerated regime as θ and W increase, with the critical Θ value approaching 1 under flame acceleration conditions. A power-law relationship is observed between the mass loss rate and the characteristic combustion zone length (l_c), and the power exponent first increases and then decreases with θ. Concurrently, the dominant heat transfer mode shifts from radiation to convection with increasing θ.

Key words: inclination angle, material width, flame spread rate, polymethyl methacrylate (PMMA), accelerated spread, mass loss rate

中图分类号:

X932爆炸安全与防火、防爆

范传刚, 饶冠杰, 卜蓉伟. 不同倾斜角度和材料宽度下PMMA火蔓延加速行为研究[J]. 中国安全科学学报, 2026, 36(7): 53-59.

Fan Chuangang, Rao Guanjie, Bu Rongwei. Study on accelerated flame spread behavior over PMMA plates under different inclination angles and material widths[J]. China Safety Science Journal, 2026, 36(7): 53-59.

图/表 12

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试验工况	θ/(°)	W/mm
1~6	0	25、50、75、100、125、150
7~12	7.5	25、50、75、100、125、150
13~18	15.0	25、50、75、100、125、150
19~24	22.5	25、50、75、100、125、150
25~30	30.0	25、50、75、100、125、150
31~36	37.5	25、50、75、100、125、150
37~42	45.0	25、50、75、100、125、150

不同倾斜角度和材料宽度下PMMA火蔓延加速行为研究

Study on accelerated flame spread behavior over PMMA plates under different inclination angles and material widths

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