The behavior of methane/hydrogen/air premixed flame in a closed channel with inhibition
The behavior of methane/hydrogen/air premixed flame in a closed channel with inhibition
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甲烷/氢气/空气预混火焰在封闭通道内的抑制行为
DOI：
10.1016/j.fuel.2019.116810
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发表时间：
2020-04
期刊：
影响因子：
7.4
通讯作者：
Xiu Guangli
中科院分区：
文献类型：
--
作者：
Zhang Chao;Shen Xiaobo;Wen Jennifer;Xiu Guangli
富氢天然气(HNG)是一种很有前途的替代燃料。但与天然气相比，混合燃料不可避免地具有不同的着火和燃烧特性。由此产生的差异的程度取决于氢气添加的百分比。它可能会影响燃烧系统的兼容性，并具有安全隐患。本研究旨在通过惰性气体的抑制来提高HNG的安全性。对甲烷/氢气/空气预混火焰在以氮气或二氧化碳为阻燃剂的封闭通道中的传播进行了实验室试验。研究了燃料中氢体积分数为0%、20%、50%和80%的混合燃料。用高速纹影照相术和压力传感器分别记录了火焰的形状演变和通道内的超压。火焰形状随缓蚀剂和氢含量的不同而发生不同的变化。压力波对火焰和压力动力学有显著的影响。并对浮力对火焰变形的影响进行了观察和讨论。结果表明，N_2和CO_2对通道内的火焰速度和超压积累均有较大的抑制作用，且CO_2的抑制作用更强。从热力学和动力学两方面揭示了N_2和CO_2的缓蚀机理。
Hydrogen enriched natural gas (HNG) is a promising alternative fuel. But the blended fuel will inevitably have different ignition and combustion characteristics as compared to natural gas. The extent of the resulting difference depends on the percentage of hydrogen addition. It may affect the compatibility of combustion systems and have safety implications. The present study was aimed at enhancing the safety of HNG through inhibition by inert gases. Laboratory tests were conducted for methane/hydrogen/air premixed flame propagating in a closed channel with either nitrogen (N2) or carbon dioxide (CO2) as the inhibitor. Mixtures with different hydrogen volumetric fractions in fuel, including 0%, 20%, 50% or 80% were investigated. The flame shape evolution and the overpressure in the channel were recorded by high-speed Schlieren photography and pressure sensor, respectively. The flame shape was found to change in various ways depending on the inhibitor and hydrogen content. The pressure wave had remarkable impacts on flame and pressure dynamics. The effect of buoyancy on the flame deformation was observed and discussed. Both N2and CO2were found to have considerable inhibiting effect on the flame speed and overpressure build-up in the channel while the inhibiting effect of CO2was stronger. The inhibition mechanisms of either N2or CO2were revealed from thermal and kinetic aspects.
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作者：
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DOI：
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作者：
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