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为研究独头巷道内不同长度瓦斯积聚区的爆炸特征,运用计算流体力学软件FLACS进行了数值模拟,对比了瓦斯爆炸超压及正压冲量等参数及其在巷道内的分布情况,分析了瓦斯积聚范围对爆炸冲击波破坏特征的影响规律,研究了独头巷道内不同长度瓦斯积聚区爆炸冲击波与火焰相互作用的特点。研究结果表明:随着独头巷道内瓦斯积聚范围的增大,爆炸冲击波破坏特征会发生突变,最大爆炸压力阶梯式增大,瓦斯积聚范围超过某一临界值后,最大爆炸压力出现位置从巷道封闭端向开放端转移;最大爆炸冲量先单调增加而后趋于稳定,最大爆炸冲量位置始终处在巷道封闭端;回传稀疏波对火焰的加速作用是导致巷道近开放端爆炸超压突增的主要原因。
In order to study the explosion characteristics of gas accumulation zones with different lengths in a single laneway, numerical simulation was carried out by computational fluid dynamics software FLACS. Parameters such as overpressure and positive pressure impulse of gas explosion and their distribution in the roadway were compared. The impact of the accumulation range on the damage characteristics of the blast shock wave and the characteristics of the interaction between the blast shock wave and the flame in the gas accumulation zones with different lengths in the single headway are studied. The results show that with the increase of the gas accumulation range in a single laneway, the failure characteristics of the blast shock wave will change suddenly and the maximum explosion pressure increases stepwise. After the gas accumulation range exceeds a certain critical value, the maximum explosion pressure appears from the laneway The maximum explosion impulse firstly monotonically increases and then tends to be stable, and the position of the maximum impulse is always at the closed end of the roadway; the acceleration effect of the return sparse wave on the flame is caused by the explosion overpressure of the explosion near the open end of the roadway main reason.