泡沫金属对甲烷/空气爆燃火焰的淬熄实验研究

Experiment study on quenching effect of foam metal on methane-air deflagration flame

为研究多孔材料对甲烷/空气预混气体爆燃火焰的抑制淬熄效果,运用一套自主设计的管道爆炸抑制系统进行实验研究。在实验中运用高速摄像机记录爆燃火焰在穿过多孔材料板时的淬熄过程,采用20,40,60,80PPI(孔目数)的4种多孔材料,研究不同孔目数的多孔材料对爆燃火焰传播的形态结构、火焰传播速度以及抑制淬熄等特性的影响。结果表明:多孔材料的孔目数对爆燃火焰传播的早期阶段影响较小,爆燃火焰都经历了半球形火焰和指形火焰阶段;当火焰传播到多孔材料板时,孔目数越大对火焰的降速作用越强,80PPI工况下爆燃火焰不能穿过多孔材料板,即发生淬熄。实验结果揭示了多孔材料对火焰的淬熄作用与微孔通道和火焰的相互作用有关。

In order to study the suppression and quenching effect of porous material on the deflagration flame of premixed methane-air gas,the experimental study was carried out by using the self-developed pipe explosion suppression system. The high-speed camera was applied to record the quenching process of deflagration flame passing through the porous material plate,and four types of porous material with the mesh number of 20,40,60 and 80 PPI respectively were adopted. The influence of porous material with different mesh numbers on the characteristics of deflagration flame,such as the morphological structure,the propagating speed and the suppression and quenching was studied. The results showed that the mesh number of porous material had less influence in the early stage of deflagration flame propagation,and all the deflagration flames went through the stages of hemispherical flame and finger-shaped flame. When the flame propagated to the porous material plate,the larger the mesh number,the stronger the speed reduction effect on the flame,and the deflagration flame could not propagate through the porous material plate under the condition of 80 PPI,namely the occurrence of quenching. The results revealed that the quenching effect of porous material on the flame is related with the interaction between the micropore passage and the flame.