Abstract To obtain the optimal dust-exhausting airflow volume on the premise that the gas concentration in the fully mechanized caving face of high-gas coal mine can be fully diluted to the safe range, gas-respirable dust (RD) coupling dispersion under various inlet airflow volumes (Q) were simulated numerically. The results show that when Q≥2100 m3/min, the gas concentration in the mining face is fully diluted. RD is distributed in basically the same way under various airflow volumes. When Q is raised from 2100 m3/min to 2500 m3/min, the RD concentration falls continuously. However, Q continues to increase, RD concentrations no longer decrease significantly. when Q is promoted to 2700 m3/min, the phenomenon of dust reentrainment occurs. Therefore, 2500 m3/min can be regarded as the optimal dust-exhausting airflow volume. Field measurement and verification shows hat the average relative errors between the simulated results and measured results of airflow velocity, gas concentration and RD concentration are 5.8%, 4.13% and 5.18% respectively, which means that the numerical simulation results boast high reliability.

中文翻译：

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高瓦斯煤矿综放工作面最优排尘风量数值模拟研究

摘要 为了在高瓦斯煤矿综放工作面瓦斯浓度能够充分稀释到安全范围的前提下，获得最佳排尘风量，在不同入口下的瓦斯-可吸入粉尘（RD）耦合分散。气流体积 (Q) 进行了数值模拟。结果表明，当Q≥2100 m3/min时，工作面瓦斯浓度得到充分稀释。RD 在不同风量下的分布基本相同。当 Q 从 2100 m3/min 提高到 2500 m3/min 时，RD 浓度不断下降。然而，Q继续增加，RD浓度不再显着降低。当Q提升到2700m3/min时，出现扬尘回卷现象。因此，2500 m3/min 可视为最佳排尘风量。