摘要
为深入理解机械排烟对腔室火灾行为的影响,研究机械排烟作用下火源大小、开口面积和形状、火源水平位置等因素对腔室火灾行为的影响,分析不同参数对腔室火灾行为的影响,以及机械排烟作用下不同结构腔室火灾行为特点。研究结果表明:火源尺寸是决定火源热释放速率和室内平均温度上限的关键因素,而不同的火源水平位置会在通风条件改变后影响火灾行为的走向;机械排烟对腔室火灾的火源热释放速率同时具有“供氧助燃效应”和“通风散热效应”,对室内平均温度同时具有“助燃效应”和“散热效应”,这些对立效应之间的竞争关系将决定火源热释放速率及室内平均温度变化。研究结果可为建筑机械排烟系统的优化设计及火灾救援策略制定提供参考。
In order to deeply understand the effect of mechanical smoke exhaust on chamber fire behavior,this study investigatesthe influence of fire source size,opening area and shape,horizontal position and other factors on chamber fire behavior under mechanical smoke exhaust,analyzed the influence of different parameters on chamber fire behavior,and analyzed the fire behavior characteristics of different structures under mechanical smoke exhaust.The results show that the size of fire source is the key factor to determine the heat release rate of fire source and the upper limit of indoor average temperature,while the different horizontal position of fire sources will affect the direction of fire behavior after the change of ventilation conditions.Mechanical smoke exhaust has both“oxygen supply effect”and“ventilation suppression effect”on the fire source heat release rate of chamber fire,and has both“combustion support effect”and“heat dissipation effect”on the indoor average temperature.The competition between these opposing effects will determine the fire source heat release rate and the indoor average temperature change.The findings can provide a reference for optimizing the design of mechanical smoke exhaust systems and formulating fire rescue strategies in buildings.
作者
李堃
郝文杰
张宇伦
毛少华
LI Kun;HAO Wenjie;ZHANG Yulun;MAO Shaohua(Faculty of Engineering,China University of Geosciences(Wuhan),Wuhan Hubei 430074,China)
出处
《中国安全生产科学技术》
北大核心
2025年第6期37-46,共10页
Journal of Safety Science and Technology
基金
国家自然科学基金项目(52406162)
湖北省自然科学基金项目(2025AFB913)
博士后研究人员计划C档资助项目(GZC20241593)
中国博士后科学基金资助项目(2024M753029)
湖北省博士后项目(2024HBBHCXA090)
中国地质大学(武汉)“地大学者”人才岗位科研启动经费资助项目(2023097)。
关键词
腔室火灾
机械排烟
火源尺寸
温度场
热释放速率
chamber fire
mechanical smoke exhaust
fire source size
temperature filed
heat release rate
