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Numerical investigation of premixed syngas/air flame evolution in a closed duct with tulip flame formation

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  • Zheng, Kai
  • Jia, Qianhang
  • Song, Zengyi
  • Zhou, Zhifeng
  • Ren, Jiale
  • Chen, Xi

Abstract

In this study, the dynamic behavior of the premixed syngas/air flames in enclosed ducts with obstacles at the blockage ratio of 0.5, as well as without obstacles, was studied via large eddy simulation and the turbulent flame speed closure model. The hydrogen volume fraction (hydrogen content in fuel) was set to 50 %. Results indicate that the simulation reproduced the flame shapes, flame speed and explosion overpressure observed in the experiments. In cases without obstacles, a “tulip” flame with a tulip cusp can be seen, and secondary cusps emerge on tulip lips due to the high-pressure zone ahead of “tulip” flame lips, leading to in a distorted “tulip” flame. In cases with obstacles, the flame develops hemispherical and finger shapes upstream of the obstacles and evolves into a “tulip” flame downstream of the obstacles due to vortices and adverse pressure gradients. The alteration of the flow direction within the unburned and burned zones results in intricate flame shapes. Flame speed and overpressure show a close relationship and exhibit oscillations following the generation of the “tulip” flame. Typically, the velocity, pressure and flow fields adjacent to the flame front can affect dynamic behaviors of premixed syngas/air flames.

Suggested Citation

  • Zheng, Kai & Jia, Qianhang & Song, Zengyi & Zhou, Zhifeng & Ren, Jiale & Chen, Xi, 2024. "Numerical investigation of premixed syngas/air flame evolution in a closed duct with tulip flame formation," Renewable Energy, Elsevier, vol. 236(C).
    • Handle: RePEc:eee:renene:v:236:y:2024:i:c:s096014812401499x
    DOI: 10.1016/j.renene.2024.121431
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    References listed on IDEAS

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