为研究多孔材料对封闭管道内甲烷 -空气预混气体火焰传播的影响 ,设计加工了横截面积为80mm×80mm的方形试验管道 ,运用自发光拍摄技术和动态压力传感器对甲烷 -空气预混火焰在该管道内传播过程中形状变化和压力特性进行了实验研究.结果表明 ,在管道尾部放置3种不同材质的多孔材料时 ,其对爆炸压力均有一定的抑制作用 ,聚氨酯泡沫对管道内压力的衰减效果优于聚苯乙烯泡沫和自制泡沫材料.对压力曲线进行一次求导 ,得出了压力变化速率 ,结果与空管道实验相比 ,在放置多孔材料的管道内压力降低的速率更快 ,时间更短.%The paper aims at explaining the effects of porous foam on premixed methane/air flame propagation in the closed ducts .The dynamic pressure testing and self-luminous shooting techniques are used to analyze flame propagation character-istic in a square-shape explosion test pipe with 80 mm × 80 mm cross-section .The results show that porous foam has cer-tain inhibition on gas explosion pressure .The failure effect of polyurethane foam on pipe pressure is better than polystyrene foam and self-made porous material .First-order derivative of the flame pressure distribution curve is numerically comput-ed and the result shows that pressure is decreased faster in the pipe that porous materials are placed compared to vacuum duct experiments .
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