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Physics and flame morphology of supersonic spontaneously combusting hydrogen spouting into air

Author

Listed:
  • Jiang, Yiming
  • Pan, Xuhai
  • Cai, Qiong
  • Wang, Zhilei
  • Klymenko, Oleksiy V.
  • Hua, Min
  • Wang, Qingyuan
  • Zhang, Tao
  • Li, Yunyu
  • Jiang, Juncheng

Abstract

Spontaneous ignition resulting from the accidental release of high-pressure hydrogen is an important safety issue, and the self-ignition flame can eventually induce a jet flame. However, the links between the self-ignition flame inside a tube and an external jet flame are unclear. Hence, this paper presents a study on how the self-ignition flame transforms into the jet flame in the near-field region of the nozzle. Effects of release pressure and tube length are investigated. Changes in release conditions can lead to changes in the flow characteristics of the self-combustible jet at the nozzle. Results show that the difference in the flow parameters is manifested in three aspects, which directly contribute to the diversity of transition forms. The expansion processes and shock structure govern the flame transition. The expansion process consists of two typical stages, which lead to two different flame morphologies. Besides, the presence of discontinuous surfaces in the shock wave structure can cause the self-ignition flame to extinguish or re-ignition in some transition processes, resulting in the flame appearing in different zones during different transitions. Finally, five forms of flame transition are proposed and their formation reasons are analyzed. Dominant factors and links between different transitions are eventually identified.

Suggested Citation

  • Jiang, Yiming & Pan, Xuhai & Cai, Qiong & Wang, Zhilei & Klymenko, Oleksiy V. & Hua, Min & Wang, Qingyuan & Zhang, Tao & Li, Yunyu & Jiang, Juncheng, 2022. "Physics and flame morphology of supersonic spontaneously combusting hydrogen spouting into air," Renewable Energy, Elsevier, vol. 196(C), pages 959-972.
    • Handle: RePEc:eee:renene:v:196:y:2022:i:c:p:959-972
    DOI: 10.1016/j.renene.2022.06.153
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    References listed on IDEAS

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    1. Liu, Xiong & Godbole, Ajit & Lu, Cheng & Michal, Guillaume & Venton, Philip, 2014. "Source strength and dispersion of CO2 releases from high-pressure pipelines: CFD model using real gas equation of state," Applied Energy, Elsevier, vol. 126(C), pages 56-68.
    2. Shen, Xiaobo & Xu, Jiaying & Wen, Jennifer X., 2021. "Phenomenological characteristics of hydrogen/air premixed flame propagation in closed rectangular channels," Renewable Energy, Elsevier, vol. 174(C), pages 606-615.
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