氢气因其能量利用率高、燃烧产物清洁和生产途径广泛等优点近年来备受青睐，目前较为成熟的运输氢气方法是利用现有的天然气管网，将氢气与天然气掺混进行运输。然而由于人为操作失误和管道腐蚀等因素易引起气体泄漏继而发生燃烧和爆炸，导致严重的人员伤亡和财产损失。因此，开展甲烷-氢气预混气体燃爆抑制技术的研究，对于氢能燃爆防治和氢能产业保障具有重要意义。

本文对比研究了无金属丝网及内置金属丝网管道中甲烷-氢气预混爆炸火焰的火焰传播形态、火焰锋面及超压等特征参数的变化规律，明确了金属丝网和氢气体积分数对甲烷-氢气预混爆炸火焰传播特性及淬熄规律的影响。结果表明，无金属丝网和未淬熄火焰的金属丝网管道中预混爆炸火焰的火焰前锋速度和压力随氢气体积分数增大而增大，且火焰传播普遍经历指尖型、斜坡型、平面型和郁金香型四个阶段；然而火焰被淬熄时仅出现指尖型和斜坡型两种结构变化。当单层金属丝未成功淬熄火焰时，火焰传播时间、临界平面时间和火焰前锋速度峰值随丝网目数增大而增大，压力峰值则恰好相反；当多层金属丝网未成功淬熄火焰时，火焰前锋速度峰值与压力峰值和氢气体积分数呈正相关，和丝网层数呈负相关。对比无金属丝网管道中火焰速度峰值可知，单层金属丝网位于管道前段时抑制火焰传播，而位于管道中段时则促进了火焰传播，而多层金属丝网无论位于管道前段或中段均能有效抑制火焰传播。临界金属丝网层数位于管道前段和中段时火焰前锋速度峰值分别衰减了47.883%和31.357%。此外，随着氢气体积分数和金属丝网与点火源间距离的增大，淬熄火焰所需的金属丝网目数和层数随之增大。金属丝网淬熄火焰的主要原因在于丝网对火焰的吸热和切分作用，导致火焰团失去热平衡，从而阻止了预混爆炸火焰的传播。

综上所述，可燃气体特性、金属丝网几何参数和其距离点火源位置对预混爆炸火焰的传播特性均有着显著影响。预混气体中氢气含量越高，火焰越难淬熄；金属丝网放置位置距离点火源越近，丝网的体积越大，其阻火效果越好。本文的研究结果对预防与控制甲烷-氢气预混气体燃爆事故具有一定的指导意义。

Hydrogen has been favored in recent years due to its high energy utilization, clean combustion products, and wide production routes, at present, the more mature method is to use the existing natural gas pipeline network to mix hydrogen and natural gas for transportation. However, due to human errors and pipeline corrosion, it is easy to cause gas leakage and then combustion, resulting in serious casualties and property losses. Therefore, it is of great significance to carry out research on methane-hydrogen premixed gas explosion suppression technology for the prevention and control of hydrogen energy explosion and the guarantee of hydrogen energy industry.

In this paper, the variation laws of characteristic parameters such as flame propagation pattern, flame front and overpressure of methane-hydrogen premixed flames in pipelines without wire mesh and built-in wire mesh are comparatively studied. The effects of wire mesh and hydrogen volume fraction on the flame propagation characteristics and quenching laws of methane-hydrogen premixed explosions were clarified. Research indicates, the flame front velocity and pressure of the premixed flame in the wire-free pipelines and wire mesh pipes that failed to quench the flame increased with the hydrogen volume fraction. And the flame propagation in these two pipelines generally goes through four stages: finger type, slope type, plane type and tulip type, however, when the wire mesh quenches the flame, only two structural changes occur: fingertip type and slope type. When the single-layer wire is failed to quench the flame, the flame propagation time, the critical plane time and the peak flame front velocity increase with the increase of the mesh number, while the peak pressure is just the opposite. When the multi-layer metal wire is failed to quench the flame, the peak flame front velocity was positively correlated with the pressure peak and hydrogen volume fraction, and negatively correlated with the number of wire mesh layers. By comparing it with the peak flame velocity in the wire-free pipelines, the single-layer wire mesh inhibits flame propagation when placed in the front section of the pipelines, and promotes flame propagation when placed in the middle of the pipelines. The multi-layer wire mesh can greatly attenuate the peak velocity of the premixed flame front regardless of whether it is located in the front or middle section of the pipeline, effectively suppressing the flame propagation. The critical wire mesh layers are located in the front and middle sections of the pipeline, which are attenuated by 47.883% and 31.357% respectively, compared with the peak flame front velocity in the wire-free pipelines. In addition, with the increase of the hydrogen volume fraction and the distance between the wire mesh and the ignition source, the number of meshes and layers of the wire mesh required to quench the flame increases. The main reason for the quenching of the flame by the wire mesh is the endothermic and slicing effect of the wire mesh on the flame, which causes the flame mass to lose thermal balance, thereby effectively preventing the spread of the premixed flame.

To sum up, the characteristics of the combustible gas, the geometrical parameters of the wire mesh and its distance from the ignition source have a significant effect on the propagation characteristics of the premixed flame. The higher the hydrogen content in the premixed gas, the more difficult the flame will be quenched; the closer the wire mesh is placed to the ignition source, the larger the volume of the wire mesh, and the better the flame resistance effect. The research results in this paper have certain guiding significance for the prevention and control of methane-hydrogen premixed gas explosion accidents.

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