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On the equivalent effect of initial temperature and pressure coupling on the flame speed of methane premixed combustion under dilution

Author

Listed:
  • Han, Zhiqiang
  • Zhu, Zhennan
  • Yu, Wenbin
  • Liang, Kun
  • Zuo, Zinong
  • Xia, Qi
  • Zeng, Dongjian

Abstract

This study was conducted with methane as fuel and CO2 as diluent gas. The equivalent effect of initial temperatures (323–423 K) and pressures (0.1–0.3 MPa) coupling on methane-air premixed combustion flame propagation speed (i.e. increasing or decreasing initial temperature and pressure simultaneously to have same flame propagation speeds when equivalence ratio and fraction of CO2 are unchanged) was investigated under a series of fractions of CO2 (0%–16%) and equivalence ratios (0.9, 1.0, and 1.1). Laminar burning velocities of different test conditions with similar flame propagation speeds were investigated and flame instability was also analyzed. The results show that similar flame speeds can be obtained when elevating initial temperature and pressure synchronously under constant equivalence ratio and the fraction of CO2. Similar flame propagation speeds can lead to close laminar burning velocities and similar flame structures. Flame speed under higher initial temperature and pressure is more sensitive to temperature and pressure, but dilution can suppress this sensitivity. Flame instability is stronger under higher initial temperature and pressure. Hydrodynamic instability dominates and it is mainly influenced by flame thickness. Differences are also shown in pressure and temperature during non-laminar stage. Dilution can enhance the difference in combustion duration.

Suggested Citation

  • Han, Zhiqiang & Zhu, Zhennan & Yu, Wenbin & Liang, Kun & Zuo, Zinong & Xia, Qi & Zeng, Dongjian, 2020. "On the equivalent effect of initial temperature and pressure coupling on the flame speed of methane premixed combustion under dilution," Energy, Elsevier, vol. 207(C).
    • Handle: RePEc:eee:energy:v:207:y:2020:i:c:s0360544220313761
    DOI: 10.1016/j.energy.2020.118269
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    References listed on IDEAS

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    1. Pizzuti, L. & Martins, C.A. & Lacava, P.T., 2016. "Laminar burning velocity and flammability limits in biogas: A literature review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 62(C), pages 856-865.
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    Cited by:

    1. Zhennan Zhu & Kun Liang & Xinwen Chen & Zhongwei Meng & Wenbin He & Hao Song, 2020. "Laminar Flame Characteristics of Premixed Methanol–Water–Air Mixture," Energies, MDPI, vol. 13(24), pages 1-13, December.
    2. Xu, Cangsu & Liu, Weinan & Oppong, Francis & Wang, Qianwen & Sun, Zuo-Yu & Li, Xiaolu, 2022. "Investigations on cellularization instability of 2-ethylfuran," Renewable Energy, Elsevier, vol. 191(C), pages 447-458.
    3. Shen, Xiaobo & Zhang, Zhenwu & Dou, Zengguo & Cong, Beihua & Xiao, Qiuping & Liu, Haifeng, 2022. "Premixed syngas/air combustion in closed ducts with varied aspect ratios and initial pressures," Energy, Elsevier, vol. 254(PC).

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