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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。
In order to explore the flame structure and propagation characteristics of aluminum powder with different particle sizes, a vertical dust burning pipeline test device was used to test the combustion of aluminum powder. With high-speed camera equipment, observe the different particle size of aluminum flame morphology. Recording the change of flame temperature of aluminum powder by using micro thermocouple. The relationship between the propagation velocity of aluminum flames with different particle sizes and the maximum temperature of flame of aluminum powder was analyzed. The results show that the smaller the aluminum particle size, the smoother the flame, the more fully the combustion, and the more intense the flame propagation speed increases. The flame propagation speed and the maximum flame temperature are inversely proportional to the particle size.