A study of explosion dynamics of a CH4/O2/CO2 premixed system

ZHONG Feixiang; ZHENG Ligang; MA Hongyan; DU Depeng; WANG Xi; PAN Rongkun

doi:10.11883/bzycj-2021-0191

Volume 42 Issue 1

Jan. 2022

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ZHONG Feixiang, ZHENG Ligang, MA Hongyan, DU Depeng, WANG Xi, PAN Rongkun. A study of explosion dynamics of a CH₄/O₂/CO₂ premixed system[J]. Explosion And Shock Waves, 2022, 42(1): 012101. doi: 10.11883/bzycj-2021-0191

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A study of explosion dynamics of a CH₄/O₂/CO₂ premixed system

doi: 10.11883/bzycj-2021-0191

ZHONG Feixiang^1
,,
ZHENG Ligang^{1, 2
,
,},
MA Hongyan¹,
DU Depeng¹,
WANG Xi¹,
PAN Rongkun^{1, 2}

1.
State Key Laboratory Cultivation Base for Gas Geology and Gas Control, School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China
2.
Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Jiaozuo 454003, Henan, China

Received Date: 2021-05-14
Rev Recd Date: 2021-08-23

Available Online: 2021-12-01

Publish Date: 2022-01-20

Abstract

Abstract

In order to explore the flame dynamics of methane under oxygen-rich conditions, a series of explosion experiments were carried out in a small-scale square transparent pipe with a CH₄/O₂/CO₂ premixed system as the research object. Through the analysis of explosion parameters, the influence of the fluctuation of initial ambient temperature on explosion intensity was revealed, and the micro-combustion mechanism of premixed system was discussed. The results show that under the ambient temperature of 273 K, the mixtures with the equivalence ratio $\varphi$ from 0.8 to 1.0, the oxygen relative ratio γ＜0.30 and $\varphi$ =1.2, γ＜0.35 could not be ignited, but other premixed systems could, and tulip and non-tulip flames were produced. According to the unique evolution characteristics of the tulip flame, the tulip flame can be divided into T-shaped tulip flame and asymmetric tulip flame. As the magnitude of γ increases, the evolution of the maximum normalized flame propagation velocity shifts from a two rises-and-two drops mode to a one rise-and-one drop mode. The increase in the initial ambient temperature has no effect on the evolutions of flame propagation velocity and explosion overpressure, but it reduces the maximum explosion overpressure and the maximum flame propagation velocity. It is worth noting that when the equivalence ratio is lower, the initial ambient temperature has stronger influence on the explosion intensity. In addition, compared with the maximum explosion overpressure, the maximum flame propagation velocity displays a closer relationship with laminar burning velocity. The chemical kinetics calculations show that the laminar burning velocity is most positively sensitive to the free-radical chain reaction R38 (namely, H+O₂=O+OH) and is most negatively sensitive to R52 (namely, H+CH₃ (+M)=CH₄ (+M)), and is most sensitive to the rate of production of the free radical OH. When the initial ambient temperature increases to 303 K, the sensitivity of the laminar burning velocity to R38 (positive) and R52 (negative) are reduced. The increase in the total mole fraction of the free radicals H, O and OH weakens the thermal diffusion instability, but enhances the hydrodynamic instability.
- oxygen-enriched methane,
- tulip flame,
- initial ambient temperature,
- sensitivity analysis

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References

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