Large Eddy Simulation on Blow-Off Limit of Methane and Hydrogen-Mixed Gas

doi:10.16183/j.cnki.jsjtu.2020.329

Abstract

Abstract:

The blow-off limits of methane and hydrogen-mixed gas on the Sydney inhomogeneous inflow jet burner were calculated and studied by large eddy simulation. The GRI 3.0 detailed reaction mechanism, 28-step and 19-step methane simplified reaction mechanisms were used to calculate the laminar premixed flames under the condition of different hydrogen-mixed fuel gases, which demonstrates the good performance of the 19-step simplified mechanism. A dynamic thickening flame combustion model was combined with the 19-step reaction mechanism to compute the Sydney partially premixed jet flame burner with a hydrogen-mixed gas (the volume ratio of V(H₂):V(CH₄):V(CO):V(CO₂) = 0.2:0.2:0.27:0.33). The blow-off limits in FA and FJ layouts of hydrogen-mixed gas are 90 m/s and 109 m/s, while for pure methane flames are 74 m/s and 128 m/s, respectively. The difference of blow-off limits between the two fuels is related to the inhomogeneity of fuel and air mixing in different layouts. This study shows that the combustion stability can be improved by optimizing the inlet layout and mixing process of fuel gas and air.

Key words: partially premixed flame, blow-off limit, hydrogen-mixed gas, thickened flame model, large eddy simulation

CLC Number:

TK16

ZHOU Xirui, WANG Ping, ZENG Haixiang, ZHANG Yang, PRASHANT Shrotriya, ANTONIO Ferrante, QI Haotian. Large Eddy Simulation on Blow-Off Limit of Methane and Hydrogen-Mixed Gas[J]. Journal of Shanghai Jiao Tong University, 2022, 56(5): 635-647.

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机理	组分信息	反应步数	简化来源
Toshimitsu^[16]	H₂、O₂、H、O、OH、H₂O、CH₃、CH₄、CO、CO₂、HCO、CH₂O、CH₃O、C₂H₂、N₂	19	GRI 1.2
Lytras-II^[17]	H₂、H、O、O₂、OH、H₂O、CH₂、CH₃、CH₄、CO、CO₂、C₂H₆、C₂H₂、N₂	28	GRI 1.2

CH₄				HMG
火焰布局	v_J/(m·s^-1)	熄灭	编号	火焰布局	v_J/(m·s^-1)	熄灭	编号
FA	64	否	-	FA	78	否	-
	70	否	-		84	否	-
	74	是	U74-CH₄		90	是	U90-HMG
FJ	114	否	-	FJ	96	否	-
	120	否	-		103	否	-
	128	是	U128-CH₄		109	是	U109-HMG