Effect of initial turbulence on explosion behavior of stoichiometric methane-ethylene-air mixtures in confined space

Wang, Kai; Meng, Shuang; Wei, Lubin; Chen, Sining; Kong, Xiangbei; Fang, Yunlong

doi:10.1016/j.psep.2022.03.072

Cited by 28 publications

(7 citation statements)

References 79 publications

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“…Almerinda [15] analyzed the effect of ignition energy and ignition source on the deflagration index and found that the deflagration index is independent of ignition energy and mainly depends on turbulence. As indicated by Yan Ming [16] and Wang Kai [17], the initial turbulence level is largely affected by the size and shape of the container.…”

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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“…The effects of alkali metals on methane explosion inhibition under various factors (i.e., concentration, inhibitor type, and oxygen concentration) have been extensively studied. − Some studies on flammable gas explosion showed that explosion intensity of olefin gas is often greater than that of alkane gas, with a more complicated explosion process. − To better ensure safe development of the C 2 H 4 industry, it is necessary to study the inhibition mechanisms associated with C 2 H 4 explosion. Even though various concentrations of KH 2 PO 4 powder proved to be the best explosion inhibitor for the C 2 H 4 system, its performances against other traditional alkali metal inhibitors (i.e., KHCO 3 or NaHCO 3 ) have not been studied yet.…”

Section: Introductionmentioning

confidence: 99%

Inhibition Effect of KHCO₃ and KH₂PO₄ on Ethylene Explosion

Wang

Yang

et al. 2023

ACS Omega

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The explosion risk of ethylene (C2H4) seriously hinders safe development of its production and processing. To reduce the harm caused by C2H4 explosion, an experimental study was conducted to assess the explosion inhibition characteristics of KHCO3 and KH2PO4 powders. The experiments were conducted based on the explosion overpressure and flame propagation of the 6.5% C2H4–air mixture in a 5 L semi-closed explosion duct. Both the physical and chemical inhibition characteristics of the inhibitors were mechanistically assessed. The results showed that the 6.5% C2H4 explosion pressure (P ex) decreases by increasing the concentration of KHCO3 or KH2PO4 powder. The inhibition effect of KHCO3 powder on the C2H4 system explosion pressure was better than that of the KH2PO4 powder under similar concentration conditions. Both powders significantly affected the flame propagation of the C2H4 explosion. Compared with KH2PO4 powder, KHCO3 powder had a better inhibition effect on the flame propagation speed, but its ability to reduce the flame luminance was less than KH2PO4 powder. Finally, the inhibition mechanism(s) of KHCO3 and KH2PO4 powders were revealed based on the powders’ thermal characteristics and gas-phase reaction.

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“…20 In addition, ethylene can promote the explosion of methane, polyethylene, and other substances, but the reason for the promoting of the increase of explosive characteristics is unclear. [21][22][23] In order to understand the explosive reaction process more intuitively, the effect of trace ethylene on a methane explosion was studied combined with the spectra of key intermediates (cOH, cH, and cCH 2 O). 24 The development of an ethylene explosive chemical kinetic model has experienced the verication and further optimization of a series of substances, involving different temperature and pressure ranges, 25,26 but there are differences.…”

Section: Introductionmentioning

confidence: 99%

The dual effect and mechanism analysis of expanded aluminum on an ethylene explosion

Wang

Gao

Pan

et al. 2023

Sustainable Energy Fuels

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Effect of initial turbulence on explosion behavior of stoichiometric methane-ethylene-air mixtures in confined space

Cited by 28 publications

References 79 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

Inhibition Effect of KHCO₃ and KH₂PO₄ on Ethylene Explosion

The dual effect and mechanism analysis of expanded aluminum on an ethylene explosion

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Effect of initial turbulence on explosion behavior of stoichiometric methane-ethylene-air mixtures in confined space

Cited by 28 publications

References 79 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

Inhibition Effect of KHCO3 and KH2PO4 on Ethylene Explosion

The dual effect and mechanism analysis of expanded aluminum on an ethylene explosion

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Product

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Inhibition Effect of KHCO₃ and KH₂PO₄ on Ethylene Explosion