摘要
为探索不同粒径铝粉火焰结构及其传播特性,用一竖直粉尘燃烧管道试验装置进行铝粉燃烧试验。借助高速摄像设备,观察不同粒径铝粉的火焰形态。利用微细热电偶记录铝粉火焰温度变化。分析不同粒径铝粉火焰的传播速度与铝粉火焰最高温度的关系。结果表明,铝粉粒径越小,火焰越平滑,燃烧越充分、越剧烈,火焰传播速度增长越快;铝粉火焰传播速度和火焰最高温度均与其粒径成反比。
To explore the structure and propagation of flames of combustible metal dusts, experiments were carried out in a piece of vertical dust combustion pipeline experimental apparatus.The propagation process of aluminum powder flame was studied by means of a high speed camera.The temperature distribution and flame structure were observed by means of fine thermocouples. The research indicated that the flame is developing freely when aluminum dust is in the initial stage of combustion, that when the flame is in contact with the side walls of pipeline, the vertical transmitting speed is accelerating and the flame brightness is increasing, that the particle size has a great difference on propagation of flames. The smaller the particle size is, the smoother the flame will be,and the faster the propagation will be,and that their is a negative correlation between the particle size and both the propagation speed and the highest temperature of aluminum dust flame.
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2016年第8期41-45,共5页
China Safety Science Journal
基金
国家自然科学基金资助(51174153
51374164)
中央高校基本科研业务费专项资金资助(2015-zy-080)
关键词
铝粉燃烧
火焰
速度
温度
传播特性
aluminum dust combustion
flame
speed
temperature
propagation characteristics
