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| 典型可燃物火灾早期不同受热温度及高度处的烟颗粒形貌特征演变规律研究 |
| Study on the Evolution of Morphological Characteristics of Smoke Particles at Different Heating Temperatures and Heights in Early-Stage Fires of Typical Combustibles |
| 投稿时间：2025-06-03 修订日期：2025-11-20 |
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| 基金项目:浙江省“尖兵”“领雁”研发攻关计划项目,工业企业安全生产智能防控关键技术-工业企业火灾灾变机理与感知预警处置一体化技术研究及应用(No. 2024C03252)；浙江省2024 年度应急管理研发攻关科技项目,基于时空AI的火灾图像特征挖掘机类型辨识方法研究(No. 2024YJ007)。 |
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| 中文关键词: 木材 烟颗粒 粒径 形貌特征 |
| 英文关键词:wood smoke particles particle size morphological characteristics |
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| 中文摘要: |
| 针对典型可燃物火灾早期不同受热温度及高度处的烟颗粒形貌特征演变规律，选用木材设计实验，对火灾早期烟颗粒形貌特征以及分布情况进行研究，围绕烟颗粒的粒径和形状，分析燃烧阶段变化对烟颗粒的影响。搭建了一个小型燃烧实验平台，通过燃烧实验收集生成烟颗粒并分析不同工况下颗粒物的表面形貌演变规律及尺寸分布。实验结果表明:燃烧产生的烟颗粒形貌特征为分形凝聚体，在本文研究的2个燃烧阶段热解和初期明火阶段燃烧中,分形维数变化不明显，相差约0.07，而主粒子粒径从热解到初期明火阶段出现下降，相差约7.63 nm;燃烧产生的烟颗粒粒子数和质量浓度粒径分布基本伴随温度上升而向较大粒径区间偏移，较大颗粒占比上升。研究结果对于感烟探测器设计优化有一定的参考意义。 |
| 英文摘要: |
| To investigate the morphological evolution characteristics of smoke particles at different heating temperatures and heights in the early stages of typical combustible fires, wood was selected to design experiments. This study focuses on the morphological characteristics and distribution of smoke particles in the early fire stage, analyzing the influence of combustion stage changes on smoke particles with respect to their particle size and shape. A small-scale combustion experimental platform was built, and the generated smoke particles were collected through combustion experiments to analyze the surface morphology evolution patterns and size distribution of particulate matter under different conditions. The experimental results indicate that the smoke particles generated by combustion are fractal aggregates. In the two combustion stages studied in this paper—pyrolysis and initial flaming—the fractal dimension showed no significant change, differing by approximately 0.07, while the primary particle size decreased from the pyrolysis stage to the initial flaming stage, differing by approximately 7.63 nm. The particle number and mass concentration particle size distributions of the generated smoke particles generally shifted toward larger particle size ranges as the temperature increased, and the proportion of larger particles rose. The research findings provide certain reference significance for the design of smoke detectors and their application within timber structures. |
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