中文摘要：

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.

英文摘要：

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.