低气压环境下正庚烷及汽油池火的燃烧特性  

Combustion Characteristics of N-Heptane and Gasoline Pool Fire Under Low Ambient Pressure Conditions

作　　者：蔡昕[1] 王喜世[1] 李权威[1] 廖光煊[1] 

机构地区：[1]中国科学技术大学火灾科学国家重点实验室,合肥230027

出　　处：《燃烧科学与技术》2010年第4期341-346,共6页Journal of Combustion Science and Technology

基　　金：国家科技支撑计划资助项目(2006BAK06B07);国家自然科学基金资助项目(50774072);教育部新世纪优秀人才支持计划资助项目(NECT-07-0794)

摘　　要：为研究低气压环境对可燃物燃烧特性的影响,利用密闭实验箱模拟低气压环境条件,研究了正庚烷及汽油池火在不同环境压力条件下的燃烧特性.实验获取了燃料的质量燃烧速率、火焰形态特征、火焰温度和烟气中的CO体积分数等燃烧特性参数.研究结果表明,随着环境压力的降低,正庚烷和汽油的质量燃烧速率减小,且质量燃烧速率与环境压力呈幂函数关系;火焰高度及火焰面积均随环境压力的减小而增大,对于实验中的正庚烷池火,火焰高度与环境压力呈幂函数关系;环境压力的降低使得火焰的高温区上移,烟气羽流的温度也相应升高;烟气中CO的峰值体积分数也随着环境压力的降低而增大.N-heptane and gasoline pool fires were studied under different ambient pressures with an airtight steel box to investigate the effects of low ambient pressure on combustion characteristics of combustible materials. Mass burning rate, flame shape, temperatures of flame and plume and CO concentration were measured during the experiments. The results show that the mass burning rate decreases with the decrease of ambient pressure, which agrees with power function rela- tion. Flame height and flame area increase when ambient pressure decreases. As to n-heptane pool fire, there are power function relationships among flame height, flame area and ambient pressure. It is also shown that with the decrease of ambi- ent pressure high temperature area of flame moves upward and fire plume temperature increases as well. The maximum of CO concentration in smoke also increases under reduced ambient pressure.

关 键 词：低气压 池火 燃烧速率 火焰高度 一氧化碳体积分数 

分 类 号：X932[环境科学与工程—安全科学]