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Constructing slotted bluff body with adaptively-regulated rear baffles for stable dynamic combustion in micro-combustors

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  • Zhang, Chenghua
  • Yan, Yunfei
  • Wu, Yonghong
  • Meng, Xiaoyue
  • Hu, Yang
  • Liu, Chang

Abstract

Enhancing hydrogen combustion performance and flame stability at micro-scales remains a significant challenge. This study proposes integrating a slotted bluff body with dual rear baffles to achieve highly efficient and stable combustion. The results demonstrate that a 0.4 mm baffle length delivers optimal combustion performance (blow-off limit: 82 m/s), with baffle inclination showing strong dependence on inlet velocity: baffle expansion improves combustion efficiency (93.90 %) at low velocities, while baffle close enhances flame stability (blow-off limit: 88 m/s) at high velocities. UDF transient simulations reveal the adaptive regulation mechanism of baffles and flame morphology evolution. During velocity step increases (10–60 m/s), baffle close reduces flow shear and stretching effects, promoting flame re-anchoring and stabilization. Conversely, during velocity decreases (60-10 m/s), immediate baffle expansion enhances blockage effects, expanding high-temperature zones and intensifying hydrogen combustion. This work systematically optimizes baffle structure and demonstrates its adaptive flame control capability, providing valuable insights for micro-scale hydrogen combustor design and load-adaptive stabilization.

Suggested Citation

  • Zhang, Chenghua & Yan, Yunfei & Wu, Yonghong & Meng, Xiaoyue & Hu, Yang & Liu, Chang, 2025. "Constructing slotted bluff body with adaptively-regulated rear baffles for stable dynamic combustion in micro-combustors," Energy, Elsevier, vol. 337(C).
    • Handle: RePEc:eee:energy:v:337:y:2025:i:c:s0360544225042719
    DOI: 10.1016/j.energy.2025.138629
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    References listed on IDEAS

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