Comparative study on flame instability and combustion characteristics of CH4/O2/CO2 and CH4/O2/N2 mixtures

Zhong, Feixiang; Zheng, Ligang; Wang, Xi; Shao, Xiangyu; Jia, Hailin; Shi, Zhanwang; Zhang, Jianlei

doi:10.1016/j.joei.2022.02.009

Cited by 23 publications

(1 citation statement)

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“…Xiao et al proposed that the Rayleigh–Taylor instability is an important mechanism for distorting tulip flame (DTF) formation, while the Richtmyer–Meshkov instability transforms the DTF into a ripple flame through impact flame interactions . Zheng et al , studied the flame instability and combustion characteristics of CH 4 /O 2 /CO 2 and CH 4 /O 2 /N 2 mixtures.…”

Section: Introductionmentioning

confidence: 99%

Study of Methane Explosion Suppression Characteristics of N₂ and CO₂ in Variable Cross-Section Ducts

et al. 2022

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To investigate the effect of concentration of N 2 and CO 2 (0, 10, 20, 30, 40, and 50%) on the flame propagation characteristics of CH 4 /air premixed gases with stoichiometric ratios in variable cross-section ducts, experiments were conducted in four combinations of ducts at initial conditions of 298 K and 1 atm. The results show that the flame propagation velocity, propagation time, and overpressure are greater in the suddenly contracted duct than in the suddenly expanded duct if the dimensions of the ducts are kept constant. However, an increase in inert gas concentration leads to a decrease in flame propagation speed, an increase in flame propagation time, and changes in flame structure and pressure. "Tulip" flames appeared when a duct with a cross section of 100 mm × 100 mm was combined with a duct with a cross section of 70 mm × 70 mm, whether N 2 or CO 2 was added or what its concentration was. However, when a duct with a cross section of 140 mm × 140 mm was combined with a 70 mm × 70 mm duct, a "tulip" flame is formed only at a CO 2 concentration of 50%. As the concentration of inert gas increases, the explosion pressure first decreases and then stabilizes, while the rate of pressure increase showed a monotonically decreasing trend. The explosion pressure is minimized when the concentration of CO 2 and N 2 is 30 and 40%, respectively.

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Section: Introductionmentioning

confidence: 99%

Study of Methane Explosion Suppression Characteristics of N₂ and CO₂ in Variable Cross-Section Ducts

et al. 2022

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Evaluation of Air Polyurethane Foam Waste Gasification

Hasanzadeh

Azdast

Park

2023

Engineering Materials

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Fundamental insights on turbulence characterization, vortex motion and ignition mechanism of sub/supersonic turbulent jet flames

Li,

Sun,

Tang

et al. 2024

Applied Thermal Engineering

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Comparative study on flame instability and combustion characteristics of CH4/O2/CO2 and CH4/O2/N2 mixtures

Cited by 23 publications

References 55 publications

Study of Methane Explosion Suppression Characteristics of N₂ and CO₂ in Variable Cross-Section Ducts

Study of Methane Explosion Suppression Characteristics of N₂ and CO₂ in Variable Cross-Section Ducts

Evaluation of Air Polyurethane Foam Waste Gasification

Fundamental insights on turbulence characterization, vortex motion and ignition mechanism of sub/supersonic turbulent jet flames

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Comparative study on flame instability and combustion characteristics of CH4/O2/CO2 and CH4/O2/N2 mixtures

Cited by 23 publications

References 55 publications

Study of Methane Explosion Suppression Characteristics of N2 and CO2 in Variable Cross-Section Ducts

Study of Methane Explosion Suppression Characteristics of N2 and CO2 in Variable Cross-Section Ducts

Evaluation of Air Polyurethane Foam Waste Gasification

Fundamental insights on turbulence characterization, vortex motion and ignition mechanism of sub/supersonic turbulent jet flames

Contact Info

Product

Resources

About

Study of Methane Explosion Suppression Characteristics of N₂ and CO₂ in Variable Cross-Section Ducts

Study of Methane Explosion Suppression Characteristics of N₂ and CO₂ in Variable Cross-Section Ducts