Influence of flame holder geometry on flame dynamics in a hydrogen industrial burner

The influence of the flame holding chamber on flame dynamics is examined at ۱۰۰% and ۵۰% load conditions in a hydrogen industrial burner. Regarding combustion characteristics, the presence of the flame holding chamber helps maintain a stable flow field across varying loads and promotes the formation of a high-temperature corner recirculation zone that enhances mixing and ignition. At ۵۰% load, the temperature within this recirculation zone is approximately ۱۰۰ K higher than in other regions of the computational domain. Chemical eigenvalue analysis reveals that combustion instability primarily occurs in the shear layer, where the dominant species is H, and the main elementary reactions are R۱۰ (HO₂ + H ⇌ H₂ + O₂) and R۱۱ (HO₂ + H ⇌ OH + OH). In terms of combustion instability, the removal of the flame-holding chamber effectively reduces pressure fluctuations and mitigates instability. At ۱۰۰% load, the pressure fluctuation range decreases by ۳۴%, and the FFT amplitude drops by ۸۰%. Singular spectrum analysis (SSA) further confirms that eliminating the flame stabilization chamber substantially suppresses pressure oscillations in the dominant SSA modes. These findings provide valuable insights for the practical application and optimization of flame stabilization chambers in hydrogen industrial burners.

کلیدواژه ها:

Hydrogen combustion ، flame dynamics ، combustion instability