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Experimental investigation on near wall ignited lean methane/hydrogen/air flame

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  • Wang, Du
  • Ji, Changwei
  • Wang, Shuofeng
  • Yang, Jinxin
  • Tang, Chuanqi

Abstract

The influences of wall are important in practical combustion devices. In present study, the propagating processes of near wall ignited laminar methane/hydrogen/air flame were explored under different hydrogen fractions in a constant volume combustion vessel mimicking engine geometry. Results showed that both effects of heat losses and wall compression cause difference of local flame speed at different directions. The flow inside burned zone induced by compression accelerates local flame speed at direction opposing to the wall, makes the local flame speed higher than freely propagating laminar flame speed. Meanwhile, flame shape changing process was quantified by fitted ellipses. It was found that flame shapes are strongly affected by the wall compression but not obviously influenced by hydrogen addition. Hydrogen addition exacerbated flame instabilities, notably improved the local and global flame speeds due to both increase of laminar flame speed and flow velocity inside burned zone. The maximum local speed increase from 258 cm/s for 20% hydrogen fraction to 695 cm/s for 80% hydrogen fraction. Maximum combustion pressure and maximum pressure rise rate were slightly increased by hydrogen addition. On contrary, the combustion duration notably decreased nearly 3 times when hydrogen fraction increased from 20% to 80%.

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  • Wang, Du & Ji, Changwei & Wang, Shuofeng & Yang, Jinxin & Tang, Chuanqi, 2019. "Experimental investigation on near wall ignited lean methane/hydrogen/air flame," Energy, Elsevier, vol. 168(C), pages 1094-1103.
    • Handle: RePEc:eee:energy:v:168:y:2019:i:c:p:1094-1103
    DOI: 10.1016/j.energy.2018.11.115
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    2. Wang, Dan & Qian, Xinming & Ji, Tingchao & Jing, Qi & Zhang, Qi & Yuan, Mengqi, 2021. "Flammability limit and explosion energy of methane in enclosed pipeline under multi-phase conditions," Energy, Elsevier, vol. 217(C).
    3. Jiajia Liu & Danyang Yu & Ping Li & Xuxu Sun & Xianfeng Chen, 2023. "Characteristics of Explosion Hazards in Methane–Air Mixtures Diluted by Hydrogen," Energies, MDPI, vol. 16(18), pages 1-14, September.

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