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The behavior of methane/hydrogen/air premixed flame in a closed channel with inhibition
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Zhang, Chao, Shen, Xiaobo, Wen, Jennifer X. and Xiu, Guangli (2020) The behavior of methane/hydrogen/air premixed flame in a closed channel with inhibition. Fuel, 265 . 116810. doi:10.1016/j.fuel.2019.116810
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Official URL: http://dx.doi.org/10.1016/j.fuel.2019.116810
Abstract
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 N2 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 N2 or CO2 were revealed from thermal and kinetic aspects.
| Item Type: | Journal Article | ||||||||
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| Subjects: | T Technology > TN Mining engineering. Metallurgy T Technology > TP Chemical technology |
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| Divisions: | Faculty of Science > Engineering | ||||||||
| Library of Congress Subject Headings (LCSH): | Natural gas , Hydrogen flames , Fuel, Hydrogen as fuel | ||||||||
| Journal or Publication Title: | Fuel | ||||||||
| Publisher: | Elsevier Ltd | ||||||||
| ISSN: | 0016-2361 | ||||||||
| Official Date: | 1 April 2020 | ||||||||
| Dates: |
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| Date of first compliant deposit: | 27 July 2020 | ||||||||
| Volume: | 265 | ||||||||
| Article Number: | 116810 | ||||||||
| DOI: | 10.1016/j.fuel.2019.116810 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||
| RIOXX Funder/Project Grant: |
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