Porous media has a significant effect on flame and overpressure of methane explosion. In this paper, the pore diameter and thickness of porous media are studied. Nine experimental combinations of different pore diameter and thickness on the propagation of flame and overpressure of methane explosion in a tube are analyzed. The results show that the porous media not only can suppress the explosive flame propagation, but the porous media with large pore diameter can cause deflagration and accelerate the transition of flame from laminar to turbulent. The pore diameter of the porous media mainly determines the quenching of the flame. Simply increasing the thickness of porous media may cause the flame to temporarily stop propagating, but the flame is not completely extinguished for larger pore diameter. However, the deflagration propagation speed of flame is affected by the thickness. The attenuation of overpressure by porous media is mainly reflected in reducing the duration of overpressure and the peak value of overpressure. The smaller the pore diameter, the greater the thickness, and the more remarkable the reduction in overpressure duration and peak value. Suitable pore diameter and thickness of porous media can effectively suppress flame propagation and reduce the maximum value and duration of overpressure.

多孔介质对火焰和甲烷爆炸的超压有重大影响。本文研究了多孔介质的孔径和厚度。分析了9种不同孔径和厚度的实验组合，这些组合对管中火焰的传播和甲烷爆炸的超压产生了影响。结果表明，多孔介质不仅可以抑制爆炸性火焰的蔓延，而且大孔径的多孔介质还会引起爆燃，并加速火焰从层流向湍流的过渡。多孔介质的孔径主要决定火焰的淬灭。简单地增加多孔介质的厚度可能会导致火焰暂时停止传播，但是对于较大的孔径，火焰不会完全熄灭。然而，火焰的爆燃传播速度受厚度的影响。多孔介质对过压的衰减主要体现在减少过压持续时间和减少过压峰值。孔径越小，厚度越大，过压持续时间和峰值的减小越明显。合适的孔径和多孔介质厚度可以有效地抑制火焰蔓延，并减小过压的最大值和持续时间。