文献类型：期刊文献

英文题名：The behavior of methane/hydrogen/air premixed flame in a closed channel with inhibition

作者：Zhang, Chao[1];Shen, Xiaobo[1,2];Wen, Jennifer X.[3];Xiu, Guangli[1,2,4]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China;[3]Univ Warwick, Sch Engn, Warwick FIRE, Coventry CV4 7AL, W Midlands, England;[4]Shanghai Environm Protect Key Lab Environm Stand, Shanghai, Peoples R China

年份：2020

卷号：265

外文期刊名：FUEL

收录：;EI(收录号：20195207933894);WOS:【SCI-EXPANDED(收录号:WOS:000508914300004)】；

基金：The authors gratefully acknowledge the financial support of National Natural Science Foundation of China (Grant No. 51604121) and the technical support from Professor Haifeng Liu and Associate Professor Hui Zhao.

语种：英文

外文关键词：HNG; Premixed flame; Inhibition; Buoyancy; Mechanism

摘要：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 (N-2) 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 N-2 and CO2 were found to have considerable inhibiting effect on the flame speed and overpressure build-up in the channel while the inhibiting effect of CO2 was stronger. The inhibition mechanisms of either N-2 or CO2 were revealed from thermal and kinetic aspects.