An overpressure-time history model of methane-air explosion in tunnel-shape space

Chen, Di; Wu, Chengqing; Li, Jun; Liao, Kexi

doi:10.1016/j.jlp.2023.105004

Cited by 9 publications

(1 citation statement)

References 32 publications

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“…However, when the concentration of 9-13vol %, the pressure time-course curve of the oscillation is more obvious. Chen et al 24 studied the methane-air mixture explosion in a long straight space, and established the relevant numerical model. The results proved that in the 20m long straight space with obstacles in the gas explosion, with the increase of the roof pressure in the space, the shock wave overpressure peak also increases.…”

Section: Introductionmentioning

confidence: 99%

Research on shock wave driving technology of methane explosion

Huang,

Liu,

Xin

et al. 2024

Sci Rep

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In order to improve the driving ability of the explosion wave simulation equipment, reduce the erosion effect of condensed explosives on the explosion wave simulation equipment, improve the safety of the test process, and make better use of the meteorological detonation driving method, it is necessary to optimize the source of the shock wave load in the driving section. Based on the finite volume method of FLACS, a methane detonation driving model corresponding to the test is established to explore the feasibility of using methane as an explosion source to test the structure against explosion shock wave. A methane detonation drive test was carried out to verify the accuracy of the numerical model. Finally, an engineering model for attenuation of shock wave overpressure peak value in pipeline is established by dimensional analysis, and the model coefficient is determined by numerical simulation and test data. The results show that the blast pressure is the highest when the methane volume ratio reaches 9.5 vol% in the methane-air mixture. Simply increasing oxygen content has little effect on the peak overpressure and positive pressure duration of shock wave. In the pure oxygen environment, the detonation effect can be achieved when the volume ratio of methane to oxygen is 1:2, and the incident pressure of the shock wave is proportional to the volume of the gas cloud. When the gas cloud volume is constant, a reasonable selection of methane-oxygen mixture ratio can achieve a better detonation effect, which can effectively increase the peak overpressure of the shock wave in the test section. The research results can provide technical reference for the development of new explosion wave simulation equipment.

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Section: Introductionmentioning

confidence: 99%