Experimental and Numerical Study of the Impact of Initial Turbulence on the Explosion Behavior of Methane‐Air Mixtures

Chen, Tao

doi:10.1002/ceat.202000619

Cited by 10 publications

(2 citation statements)

References 37 publications

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“…The findings of this study confirm the argument that intensifying flame folding and turbulence in the T-shaped pipe branches leads to an increase in explosion pressure. The study by Wang Hua et al [20] examined the impact of initial turbulence on methane-air explosions. According to the experimental results, initial turbulence contributes to an increase in both the maximum explosion pressure and the maximum rate of pressure rise.…”

Section: Introductionmentioning

confidence: 99%

Experimental Estimation of Turbulent Flame Velocity in Gasoline Vapor Explosion in Multi-Branch Pipes

Lin,

Zhang,

Duan

et al. 2024

Fire

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The overpressure characteristics of gasoline explosions in multi-branch pipes are caused by various factors, with flame velocity as a particularly significant determinant. Overlooking the impact of turbulent flow in the branch pipes can induce a significant discrepancy in the outcome when using laminar flame velocity to determine the maximum rate of overpressure rise. To quantify the impact of turbulent flame velocity on the rate of overpressure rise in the gasoline explosions within branch pipes, the laminar flame velocity was replaced with its turbulent counterpart. Additionally, modifications to the formula for calculating the maximum overpressure rise rate were implemented. Then, experimental data of peak explosion overpressure and overpressure rise rate under different numbers of branches were obtained. Finally, the empirical data were inputted into the modified formula to determine the maximum rate of overpressure rise, thus enabling the calculation of the turbulent flame velocity across varying numbers of branches. The findings reveal a positive correlation between the number of branches and the turbulent flame velocity during tube explosions. When the number of branch pipes increased from 0 to 4, the turbulent flame velocity was found to range from 8.29 to 13.39 m/s. The increase in the number of branches did not consistently enhance the turbulent flame velocity. As the number of branches increased from zero to three, the turbulent flame velocity rose accordingly. Differently, as the number of branches exceeds three, the turbulent flame velocity exhibits fluctuations and peaks at a level approximately 1.8 times higher. The research method of this paper can provide a reference for estimating the turbulent flame velocity in the combustion process of flammable gas explosions in multi-branch tunnels.

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Section: Introductionmentioning

confidence: 99%

Experimental Estimation of Turbulent Flame Velocity in Gasoline Vapor Explosion in Multi-Branch Pipes

Lin,

Zhang,

Duan

et al. 2024

Fire

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“…It was found that the explosion characteristics of CH 4 /air will change with an increase of the initial temperature. Wang and Chen 13 studied the pressure, temperature, and velocity of CH 4 /air explosion in turbulent conditions by using electric spark ignition to induce CH 4 /air explosion. It was found that the initial turbulence can increase the maximum explosion pressure and maximum pressure rise rate, shorten the time to reach the maximum explosion pressure, and improve the explosion intensity and destructive force of CH 4 /air.…”

Section: Introductionmentioning

confidence: 99%

Secondary Explosion Characteristics and Chemical Kinetics of CH₄/Air Induced by a High-Temperature Surface

Wang,

Zhang,

Wei

et al. 2023

ACS Chem. Health Saf.

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The gas explosion induced by the high-temperature surface of coal spontaneous combustion in goaf will cause a devastating blow to personnel and equipment in the process of coal mining. Secondary explosion may be induced by the high-temperature surface of coal spontaneous combustion after primary explosion with the continuous emission of gas and the ventilation of goaf. This will lead to new disasters for the ongoingrescue operation. A high-temperature source explosion experimental system consistent with the similarity and unity of goaf was designed and developed based on the similarity criterion in this study. A CH4/air explosion experiment was carried out with the high-temperature surface as an ignition source. The characteristics of secondary explosion were studied, and chemical kinetics was analyzed. It is of great significance to the safety of the process of mining production. The results show that the secondary explosion limit (6.5–14%) is less than the primary explosion (5.5–14.5%). Its explosion risk (F) is reduced by 15.6%. The key parameters P max, T max, and (dP /dt)max of secondary explosion at each concentration are lower than those of primary explosion. The t e of secondary explosion is higher than primary explosion. The most dangerous concentration of primary and secondary explosions induced by the high-temperature surface is 11.5%. Carbon oxides (CO2 and CO) and C2 hydrocarbon gases (C2H2, C2H4, and C2H6) are generated after primary explosion. The chemical kinetics of secondary explosion was analyzed with CHEMKIN Pro 2021. When the CH4 concentration is <11.5%, the formation of the key free radicals ·H, ·O, ·OH, and CH2O is inhibited due to the formation of CO2. When the CH4 concentration is ≥11.5%, the formation of the key free radicals ·H, ·O, ·OH, and CH2O is inhibited due to the generation of combustible gases (C2H2, C2H4, C2H6, and CO) and inert gas (CO2). As a result, the limit range of secondary explosion and the explosion hazard characteristics are reduced. R156 and R158 played major roles in the process of secondary explosion with the analysis of reaction sensitivity.

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Normal Detonation Shock Wave in Turbulent Flow

Avramenko,

Kovetskaya,

Kovetska

et al. 2024

Flow Turbulence Combust

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Experimental and Numerical Study of the Impact of Initial Turbulence on the Explosion Behavior of Methane‐Air Mixtures

Cited by 10 publications

References 37 publications

Experimental Estimation of Turbulent Flame Velocity in Gasoline Vapor Explosion in Multi-Branch Pipes

Experimental Estimation of Turbulent Flame Velocity in Gasoline Vapor Explosion in Multi-Branch Pipes

Secondary Explosion Characteristics and Chemical Kinetics of CH₄/Air Induced by a High-Temperature Surface

Normal Detonation Shock Wave in Turbulent Flow

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Experimental and Numerical Study of the Impact of Initial Turbulence on the Explosion Behavior of Methane‐Air Mixtures

Cited by 10 publications

References 37 publications

Experimental Estimation of Turbulent Flame Velocity in Gasoline Vapor Explosion in Multi-Branch Pipes

Experimental Estimation of Turbulent Flame Velocity in Gasoline Vapor Explosion in Multi-Branch Pipes

Secondary Explosion Characteristics and Chemical Kinetics of CH4/Air Induced by a High-Temperature Surface

Normal Detonation Shock Wave in Turbulent Flow

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Product

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Secondary Explosion Characteristics and Chemical Kinetics of CH₄/Air Induced by a High-Temperature Surface