甲烷爆炸传播过程膜状障碍物的激励效应研究

Research on excitation effect of membrane obstacle in propagation process of methane explosion

针对管状空间内膜状障碍物对甲烷爆炸传播的激励效应现象,基于机理分析进行了数值模拟和实验研究,计算分析薄膜附近爆炸冲击波压力峰值大小与火焰速度变化,同时运用激波管道进行相同工况条件下的实验,并对两者结果对比分析,发现有无膜状障碍物的压力峰值相差6倍以上。研究表明,膜状障碍物的激励效应是破膜以后形成的带压燃烧,提高了燃烧速率,导致甲烷爆炸的火焰传播速度剧增。实验结果一定意义诠释了同样数量的甲烷气体爆炸在不同环境内后果上的巨大差异,研究结果对矿井瓦斯爆炸事故调查及防治具有指导意义。

Aiming at the phenomenon of excitation effect of membrane obstacle on the methane explosion propagation in the tube space,the numerical simulation and experimental study were carried out on the basis of mechanism analysis.The pressure peak value of explosion shock wave and flame velocity change near the membrane were calculated and analyzed,meanwhile,the shock wave tube was used to carry out the experiments with the same working conditions.The results were compared and analyzed,and it was found that the pressure peaks with and without the membrane obstacle reached more than 6 times.The results showed that the excitation effect of the membrane obstacle was the pressure combustion formed after the membrane was broken,which increased the combustion rate and caused the flame propagation speed of methane explosion to increase dramatically.The results of the experiments explained the wide difference of consequences by the explosion of methane with the same quantity in different environments.The results have the guiding significance to the investigation and prevention of mine gas explosion accidents.