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Premixed syngas/air combustion in closed ducts with varied aspect ratios and initial pressures

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  • Shen, Xiaobo
  • Zhang, Zhenwu
  • Dou, Zengguo
  • Cong, Beihua
  • Xiao, Qiuping
  • Liu, Haifeng

Abstract

Syngas is a promising renewable energy carrier, and its combustion can result in a significant reduction of pollutant emissions. However, syngas has various production sources, its compositions are diverse accordingly. That brings some challenges in its practical application. Therefore, in order to deeply investigate the premixed stoichiometric syngas/air combustion in confined spaces, experiments were conducted in a closed duct with varied aspect ratios (12, 26 and 40) and initial pressures from 0.5 atm to 1.5 atm. Flame shape evolutions in varied cases were captured through high-speed photography, and four flame speed oscillation regimes were distinguished qualitatively. The pressure buildup was recorded by sensors and scrutinized by dimensionless method. The results denoted the propagation dynamics became more violent with higher initial pressure or aspect ratio. Further, the combustion instability was examined, and it indicated the acoustic effect and the Rayleigh-Taylor/Richtmyer-Meshkov instability would be stronger in cases with large aspect ratio, resulting in the deformation of elongated tulip flame. Besides, the Bychkov's theory considering gas compression effect was validated by the experimental data. The discrepancy between them was interpreted with a comprehensive view of enlarged laminar burning speed, non-adiabatic sidewall and finite flame front thickness.

Suggested Citation

  • 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).
    • Handle: RePEc:eee:energy:v:254:y:2022:i:pc:s0360544222013603
    DOI: 10.1016/j.energy.2022.124457
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    2. Baraiya, Nikhil A. & Ramanan, Vikram & Nagarajan, Baladandayuthapani & Vegad, Chetankumar S. & Chakravarthy, S.R., 2023. "Dynamic mode decomposition of syngas (H2/CO) flame during transition to high-frequency instability in turbulent combustor," Energy, Elsevier, vol. 263(PD).
    3. Guo, Liang & Yu, Changyou & Sun, Wanchen & Zhang, Hao & Cheng, Peng & Yan, Yuying & Lin, Shaodian & Zeng, Wenpeng & Zhu, Genan & Jiang, Mengqi, 2024. "Study on effects of ethylene or acetylene addition on the stability of ammonia laminar diffusion flame by optical diagnostics and chemical kinetics," Applied Energy, Elsevier, vol. 362(C).
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    5. Qi, Beibei & Li, Haitao & Zhai, Fuer & Yu, Minggao & Wei, Chengcai, 2024. "Experimental and numerical study on the explosion characteristics of syngas under different venting conditions," Energy, Elsevier, vol. 290(C).

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