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Effect of turbulence intensity on flame propagation and extinction limits of methane/coal dust explosions

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  • Jiang, Haipeng
  • Bi, Mingshu
  • Gao, Zehua
  • Zhang, Zongling
  • Gao, Wei

Abstract

Methane/coal dust explosions pose a serious threat to the safety of coal mining. Since the flow field in the tunnel is unsteady, the effect of turbulence on flame propagation is essential for the disaster risk assessment and safety protection. In this study, the effect of turbulence intensity (u′) on flame propagation characteristics and extinction limits of methane/coal dust explosions is investigated. The turbulence parameters of the flow field and the turbulence-flame interaction are estimated by Particle Image Velocimetry. Luminous flame (raw image) and reaction front (OH radical image) of methane/coal dust mixture are captured. The results reveal that the flame propagation velocity increases by 78–200%, when the u′ increases from 1.86 to 2.66 m/s. The acceleration of flame propagation velocity is due to the increase of the release of volatile matter and the flame folded regions caused by the turbulence. When the characteristic time of the turbulence disturbance becomes shorter than that of the chemical reactions, the heat sink effect of turbulence will dominate the combustion process. In this case, the extinction limits of CH4/coal flames increase with the u′. When the u′ increases from 1.86 to 2.66 m/s, the extinction limits of CH4/coal flames increase by 14–60%.

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  • Jiang, Haipeng & Bi, Mingshu & Gao, Zehua & Zhang, Zongling & Gao, Wei, 2022. "Effect of turbulence intensity on flame propagation and extinction limits of methane/coal dust explosions," Energy, Elsevier, vol. 239(PC).
    • Handle: RePEc:eee:energy:v:239:y:2022:i:pc:s0360544221024944
    DOI: 10.1016/j.energy.2021.122246
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    4. Yan, Ke & Qi, Shaobo & Li, Runhan & Sun, Haoshi & Bai, Jiaqi & Wang, Kuo & Li, Mingzhi & Yuan, Mengqi, 2024. "Study on the inhibition of explosion and combustion of coal dust based on the structure of core-shell microencapsulated polyurethane," Energy, Elsevier, vol. 290(C).
    5. Tianyou Pei & Feixue Chen & Shuheng Qiu & Dawei Wu & Weiwei Gao & Zhaoping Xu & Chi Zhang, 2022. "Research on the Intake Port of a Uniflow Scavenging GDI Opposed-Piston Two-Stroke Engine," Energies, MDPI, vol. 15(6), pages 1-15, March.
    6. Ye, Congliang & Zhang, Qi, 2022. "Chain explosion behaviors induced by discontinuous methane/air distribution," Energy, Elsevier, vol. 252(C).
    7. Dai, Huaming & Yin, Hepeng & Zhai, Cheng, 2022. "Experimental investigation on the inhibition of coal dust deflagration by the composite inhibitor of floating bead and melamine cyanurate," Energy, Elsevier, vol. 261(PA).
    8. Nie, Wen & Cai, Yuankun & Wang, Luyao & Liu, Qiang & Jiang, Chenwang & Hua, Yun & Cheng, Chuanxing & Zhang, Haonan, 2024. "Coupled diffusion law of windflow-gas-dust in tunnel energy extraction processes and the location of optimal pollution control exhaust duct," Energy, Elsevier, vol. 304(C).

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