The goaf in coal mines is composed of loose media formed by fragmented coal and rock, and the explosion characteristics of gas within such loose media differ significantly from those in free spaces. In this paper, methane explosion experiments in loose media were conducted to investigate the influence of porosity on the explosion characteristics of methane. The results indicate that under the current conditions, the inhibition rate of explosion pressure and pressure rise rate by the porosity of the loose media generally follow an exponential decay trend. At a porosity of approximately 0.567, the loose media changes from inhibiting to promoting the pressure rise rate generated by the explosion. At a porosity of approximately 0.613, the loose media shifts from inhibiting to promoting the explosion pressure of methane, and the exponential decay relationship between pressure decay rate and porosity may be disrupted. Heat loss and turbulent disturbances are important factors affecting the explosion characteristics of methane in loose media. When the effect of heat loss exceeds that of turbulence disturbances, the loose media significantly suppress the methane explosion; compared to methane explosions in a cavity, the overpressure peak is reduced by 81.82% –93.14%. Conversely, when turbulent disturbances are the primary influencing factor, the loose media can promote the methane explosion reaction process; in loose media with a porosity of 0.602, the maximum rate of pressure rise of the methane explosion is 134.96% higher than that in a cavity, and the deflagration index is 99.43% higher.
Li et al. (Fri,) studied this question.
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