硬脂酸粉尘爆炸过程中火焰传播试验及数值模拟

摘要

采用试验和数值模拟相结合的方法研究了硬脂酸粉尘火焰在上端开口的圆柱形垂直燃烧管道的传播过程。试验利用高速摄影系统和红外热成像仪记录了火焰的传播过程和温度分布情况，结果表明：火焰传播速度和火焰温度均呈现先增大后减小的趋势。采用Fluent软件计算得到的模拟结果与试验值吻合较好，模拟结果揭示了硬脂酸粉尘爆炸过程中气流速度的变化情况，分析结果表明：在同一时刻，气流速度高于粉尘火焰传播速度，是造成粉尘二次扬尘，进而产生持续爆炸的重要因素之一。%Flame propagation behavior of stearic acid dust explosion in semi-enclosed vertical combustion tube was studied by experiment and numerical simulation. The results were recorded by a high speed video camera and a thermal infrared imaging device, from which it is observed that the flame propagation velocity and flame temperature both increased at first and then decreased. Simulation results obtained by Fluent software show a good agreement with test results. Simula-tion results also indicate that flow velocity is higher than flame propagation velocity during the combustion process, which is the main reason for secondary dust formation and successive explosion.