Flame Propagation Characteristics of CH4/H2/Air Laminar Flow Premix Under O2/CO2 Atmosphere

doi:10.12068/j.issn.1005-3026.2025.20230330

Abstract

Abstract:

The laminar premixed flame propagation characteristics of hydrogen-enriched gas with different hydrogen mixing ratios in an O₂/CO₂ atmosphere were systematically studied using a Bunsen burner-schlieren experimental system and the Premix model. The results show that GRI3.0 mechanism can provide accurate predictions of the laminar flame propagation velocity of mixtures under high hydrogen mixing ratios and high O₂ concentrations atmosphere. With the increase of hydrogen mixing ratios， the laminar flame propagation velocity of mixtures increase significantly at O₂/CO₂ atmosphere. The peak values of laminar flame propagation velocity slightly shift to the fuel-rich side. Meanwhile， the adiabatic flame temperature and laminar flame propagation velocity of mixtures gradually increase as the O₂concentration increases. With the increase of O₂ concentrations， the large number of H radicals enhance the dominant promotion of H+O₂=O+OH， which contributes to the increase of the laminar flame propagation velocity of mixtures.

Key words: laminar flame, oxygen-rich combustion technology, O₂ concentration, chemical kinetics, hydrogen mixing ratios

CLC Number:

X 932

Rong-xue SHANG, Hao-ying SUN, Qi-qi SUN, Xin-yue TAN. Flame Propagation Characteristics of CH₄/H₂/Air Laminar Flow Premix Under O₂/CO₂ Atmosphere[J]. Journal of Northeastern University(Natural Science), 2025, 46(6): 147-154.

Figures/Tables 10

Fig.1 Comparison of laminar flame propagation velocity of pure CH4

Fig.2 Laminar flame propagation velocity of pure CH4 under different XO2

Fig.3 Laminar flame propagation velocity of premixed gas under different XH2

Fig.4 Laminar flame propagation velocity of premixed gas with XO2 under different hydrogen mixing ratios

Table 1 Fitting correlations and fitting optionR2 of

X $H 2$	拟合关系式	拟合优度R²
0	y=481.554 73x²-95.041 77x+2.059 94	0.99
0.25	y=570.889 53x²-109.966 95x+2.384 74	0.99
0.5	y=749.951 48x²-139.828 72x+2.927 13	0.99

Table 1 Fitting correlations and fitting optionR2 of

X $H 2$	拟合关系式	拟合优度R²
0	y=481.554 73x²-95.041 77x+2.059 94	0.99
0.25	y=570.889 53x²-109.966 95x+2.384 74	0.99
0.5	y=749.951 48x²-139.828 72x+2.927 13	0.99

Fig.5 Adiabatic flame temperature of premixed gas under different XO2

Fig.6 Adiabatic flame temperature of premixed gas with XO2 under different XH2

Fig.7 Sensitivity analysis of mass combustion rate of premixed gas with different XO2

Fig.8 Molar fraction of H radical in hydrogen-doped

Fig.9 Reaction rate of H+O2=O+OH in premixed flame of hydrogen-doped gas with different XO2

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Flame Propagation Characteristics of CH₄/H₂/Air Laminar Flow Premix Under O₂/CO₂ Atmosphere

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