Journal of Aerospace Science and Technology

Journal of Aerospace Science and Technology

Effects of syngas H2/CO composition and turbulent intensity on the bluff-body premixed combustion characteristics

Document Type : Original Article

Authors
Faculty of Mechanical and Energy Engineering, Shahid Beheshti University, Tehran, Iran
Abstract
The effects of hydrogen content variation in H2/CO composition with different turbulent intensities were numerically investigated. The GRI3.0 reduced mechanism, including 15 species and 46 subreactions with scale-adaptive simulation (SAS) turbulence model and eddy-dissipation concept (EDC) turbulence-chemistry interaction, was utilized in FLUENT. In lean combustion, by increasing hydrogen content, the production of "OH"  radicals is increased, and they consume "CO"  drastically, leading to a high "CO"  consumption rate. In rich combustion, as hydrogen concentration rises, "OH"  and O radicals tend to react with hydrogen instead of "CO"  due to hydrogen’s higher reactivity, decreasing "CO"  the consumption rate. With hydrogen concentration enhancement, the amount of vapor products rises, causing the products’ heat capacity to increase. Then, the produced combustion heat, flame temperature, and produced "NO"  gases are decreased. The maximum flame temperature "NO"  occurs at the equivalence ratios of 1.1 and 0.9, respectively, from kinetics analysis. Based on the sensitivity analysis, "NO " the production rate is limited by O radicals. At the same time, maximum "NO"  occurs at equivalence ratio one from the CFD result due to the higher residence time caused by the burner geometry. The enhancement of turbulence intensity leads to high residence time, intensifying the flame and resulting in a lower lean blowout limit.
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Volume 18, Issue 2
2025
Pages 1-16

  • Receive Date 29 August 2024
  • Revise Date 22 January 2025
  • Accept Date 25 January 2025
  • First Publish Date 07 May 2025