可燃物目数对高温金属热颗粒引燃边界和燃烧行为的影响  

Influence of combustible mesh number on the ignition boundary of metal hot particles

作　　者：林义轩 袁春 王强 刘义祥 林庆文 吕慧菲 高阳 李阳 LIN Yixuan;YUAN Chun;WANG Qiang;LIU Yixiang;LIN Qingwen;LÜHuifei;GAO Yang;LI Yang(Graduate school,China People's Police University,Langfang 065000,China;Beijing Dongcheng District Fire rescue Detachment,Beijing 100061,China;Physical Evidence Appraisal Center,China People's Police University,Langfang 065000,China;College of Safety Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China)

机构地区：[1]中国人民警察大学研究生院,廊坊065000 [2]北京市东城区消防救援支队,北京100061 [3]中国人民警察大学物证鉴定中心,廊坊065000 [4]西安科技大学安全科学与工程学院,西安710054

出　　处：《清华大学学报(自然科学版)》2025年第4期690-696,共7页Journal of Tsinghua University(Science and Technology)

基　　金：河北省中央引导地方科技发展资金项目(236Z5406G);中国人民警察大学校级科研重点专项课题(ZDZX202301);公安部科技计划项目(2023JSZ08);河北省青年科学基金项目(5207042336)。

摘　　要：为探究可燃物目数对高温金属热颗粒引燃边界和燃烧行为的影响,该文以不同目数的松木粉为研究对象,通过一系列引燃实验分析引燃概率、引燃边界温度、引火延迟时间、火焰高度、火焰持续时间随目数的变化规律,揭示了可燃物目数对高温金属热颗粒引燃边界和燃烧行为的影响机制。结果表明,高温金属热颗粒引燃松木粉的最低温度随目数的增加而降低,从50目条件下的965℃降低至300目条件下的910℃;1000℃高温金属热颗粒引燃松木粉的引火延迟时间随目数的增加而减小,从50目条件下的49.8 ms降低至300目条件下的41.8 ms;同时,高温金属热颗粒的温度越高,引燃不同目数松木粉之间的火焰延迟时间差值越小;火焰高度和火焰持续时间均随目数的增加而增加,火焰高度从50目条件下的14.78 mm增加至300目条件下的17.02 mm,火焰持续时间从50目条件下的12.8 s增加至300目条件下的14 s。该研究可为调查认定高温金属热颗粒可引燃的可燃物颗粒大小提供理论依据,并为野外火灾的安全防治和应急处理提供一定参考。[Objective]In recent years,forest fires have frequently occurred worldwide,leading to substantial casualties and property losses.Many fires are caused by hot metal particles igniting forest fuels.Therefore,understanding the ignition mechanisms of high-temperature metal particles is critical.Studying how these particles ignite combustible materials is a key focus in current forest fire research,with particular attention to factors such as temperature,size,and material of the metal particles.The nature of the fuel remarkably impacts ignition,with some fuel particles being large and others small.In this study,the particle size of combustibles is characterized by their mesh number.This research examines the influence of the mesh number on the ignition boundary and combustion behavior of hot metal particles.These findings provide a theoretical basis for assessing whether hot metal particles can ignite combustibles of different particle sizes and offer valuable insights for wildfire safety,prevention,and emergency response.[Methods]This study investigates the effect of mesh number on the ignition boundary and combustion behavior of hot metal particles.Pine powder with varying mesh numbers was selected as the research object,and steel balls were used as hot metal particles to ignite the pine powder.A serie of ignition experiments was conducted using experimental devices independently developed by the China People's Police University.Experimental phenomena were recorded and analyzed using ordinary and high-speed cameras.Key parameters,such as ignition probability,ignition boundary temperature,ignition delay time,flame height,and flame duration,were studied as functions of mesh numbers.In addition,the mechanism by which mesh number influences the ignition boundary and combustion behavior of hot metal particles was explored.[Results]The minimum ignition temperature of pine wood powder by metal hot particles decreases with increasing mesh number,decreasing from 965℃at 50 mesh to 910℃at 300 mesh.The ignition delay time o

关 键 词：野外火灾 高温金属热颗粒 可燃物目数 引燃边界 

分 类 号：X932[环境科学与工程—安全科学]