Experimental and numerical evaluations on characteristics of vented methane explosion
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Experimental and numerical evaluations on characteristics of vented methane explosion SU Bin(苏彬)1, LUO Zhen-min(罗振敏)1, WANG Tao(王涛)1, LIU Lang(刘浪)2 1. School of Safety Science & Engineering, Xi’an University of Science and Technology, Xi’an 710054, China; 2. School of Energy, Xi’an University of Science and Technology, Xi’an 710054, China © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: To research the characteristics of vented explosion of methane-air mixture in the pipeline, coal mine tunnel or other closed space, the experiments and numerical simulations were carried out. In this work, explosion characteristics and flame propagation characteristics of methane in pipeline and coal mine tunnel are studied by using an explosion test system, combined with FLACS software, under different vented conditions. The numerical simulation results of methane explosion are basically consistent with the physical experiment results, which indicates that the numerical simulation for methane explosion is reliable to be applied to the practice. The results show that explosion parameters (pressure, temperature and product concentration) of methane at five volume fractions have the same change trend. Nevertheless, the explosion intension of 10.0% methane is the largest and that of 9.5% methane is relatively weak, followed by 11.0% methane, 8.0% methane and 7.0% methane respectively. Under different vented conditions, the pressure and temperature of methane explosion are the highest in the pipeline without a vent, followed by the pipeline where ignition or vent position is in each end, and those are the lowest in the pipeline with ignition and vent at the same end. There is no significant effect on final product concentration of methane explosion under three vented conditions. For coal mine tunnel, it is indicated that the maximum explosion pressure at the airproof wall in return airway with the branch roadway at 50 m from goaf is significantly decreased while that in intake airway does not change overwhelmingly. In addition, when the branch roadway is longer or its section is larger, the peak pressure of airproof wall reduces slightly. Key words: methane-air; flame propagation; CFD simulation; vented explosion; ignition position; peak pressure Cite this article as: SU Bin, LUO Zhen-min, WANG Tao, LIU Lang. Experimental and numerical evaluations on characteristics of vented methane explosion [J]. Journal of Central South University, 2020, 27(8): 2382−2393. DOI: https://doi.org/10.1007/s11771-020-4456-1.
1 Introduction Methane explosion accidents are increasingly common to happen in the natural gas and mine process industries [1−6]. It is an important way to relieve the pressure generated in restricted space
through installation of a vent for preventing or minimizing damage from an explosion. In addition, the relative position of the vent and ignition has great influence on the characteristics of methane explosion. Therefore, studies on the characteristics of vented explosion of
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