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含能材料  2015 

流动状态下铝粉爆炸过程的数值模拟

DOI: 10.11943/j.issn.1006-9941.2015.11.019

Keywords: 铝粉 扩散 爆炸 数值模拟

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Abstract:

基于计算流体力学理论, 模拟了铝粉在20L圆柱密闭容器内扩散和火焰传播随时间变化的规律, 并分析了铝粉在密闭容器内的爆炸火焰速度变化的影响因素。结果表明:铝粉粒径为7~42 μm时, 随着粒径的增加, 最大爆炸压力pmax和最大爆炸压力上升速率(dp/dt)max逐渐减小, pmax和(dp/dt)max最大值分别为0.876 MPa和120.1 MPa·s-1, 最小值分别为0.634 MPa和19.5 MPa·s-1, 模拟结果与文献吻合, pmax和(dp/dt)max与实验值最大误差分别为4.6%不超过20%。当点火延迟时间为60 ms时, 容器的径向火焰传播速度的变化趋势为先降后升再降, 最大值为150.9 cm·s-1, 最小值为70 cm·s-1

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