铝镁合金泡沫抑制甲烷-空气混合物爆炸火焰传播

Suppression of methane-air mixtures explosion flame propagation using aluminum-magnesium alloy-based foam composite

为探究铝镁合金泡沫材料对爆炸的抑制效果,用净尺寸为80 mm×80 mm×900 mm的爆炸管道,开展该泡沫材料在不同填充密度下的甲烷爆炸抑制试验;综合探讨该种材料对爆炸火焰传播速度、压力、火焰阵面形态的影响。结果表明:当填充密度为10 kg/m^3时,铝镁合金泡沫材料对火焰传播有微弱的强化作用;当填充密度大于20 kg/m^3时,它对火焰传播转变为抑制作用,随着填充密度的增加,火焰传播速度达到第一峰值的时间和管道密封膜片破裂的时间都进一步延长;填充密度达40 kg/m^3时,火焰传播被完全抑制。受填充材料的影响,火焰形态在穿越填充区域后由层流火焰变为湍流沙漏状火焰。该种材料的抑爆机制主要体现在湍流促进和冷却抑制2个方面。

For the sake of exploring the explosion suppression efficiency of aluminum-magnesium alloy-based foam composite,explosion suppression experiments were conducted by using an explosion chamber with 80 mm×80 mm in cross-section,and 900 mm in length.The influences of the filling density on the flame propagation speed,pressure and flame front morphology were observed.The results show that when the filling density is 10 kg/m^3,flame propagation is weakly enhanced by aluminum-magnesium,that when the filling density exceeds 20 kg/m^3,the effect of this material on flame propagation is transformed into suppression,that the time for the flame propagation velocity to reach the first peak and that for the explosion pressure to reach the rupture pressure are further extended with the increase of filling density,that when the filling density is 40 kg/m^3,the explosive flame propagation is completely suppressed.Affected by the filling material,the flame front morphology changes from laminar flame to turbulent'hourglass'flame after passing through the filling area.The mechanism of explosion suppression of the material is mainly reflected in both turbulence promotion and cooling inhibition.