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利用CFD三维可视化数值模拟技术分别对“U”型与“U+I”型通风方式下采空区瓦斯运移进行了模拟计算,运用UDF接口建立了基于工作面移动坐标下的采空区遗煤瓦斯渗流计算模型与回采巷道内瓦斯弥散运移计算模型,定量对比研究了不同工作面推进速度和工作面配风量条件下2种通风方式下采空区瓦斯涌出的差异性,研究结果表明:“U”型通风方式下回风巷瓦斯浓度大小约为“U+I”型通风方式的2倍,随进风巷风速增大,“U+I”型通风方式和“U”型通风方式下回风巷瓦斯浓度均呈现减幅形式减小,随工作面推进速度增大,“U”型通风方式下回风巷瓦斯浓度呈减幅形式增大,而“U+I”型通风方式下回风巷瓦斯浓度呈现近似线性形式增大,相比于“U”型通风方式,“U+I”型通风方式下上隅角瓦斯浓度可降低25%~50%。
The CFD 3D numerical simulation technology was used to simulate the gas migration in the goaf under the “U” type and “U + I” type ventilation modes respectively. Based on the UDF interface, Calculation Model of Coal Seam Percolation Permeability in Coal Mined Area and Calculation Model of Methane Dispersion in Mining Roadway, Comparing the Difference of Methane Emission from Goaf in Two Ventilation Modes with Different Working Face Advancing Speed and Working Air Distribution The results show that the gas concentration of the return airway is about twice that of the “U + I” type ventilation mode with the “U” type ventilation mode, and the air velocity of the “ The gas density of the return airway under the ”“ ”ventilation“ and the ”U“ -type ventilation mode all showed a decreasing form. With the increase of working face velocity, the gas concentration of the return airway under ”U“ ventilation mode was The gas concentration in the return airway under the ”U + I“ type ventilation mode shows an approximately linear increase, compared with the ”U“ type ventilation mode, the ”U + I" type Ventilation under the corner gas concentration can be reduced by 25% to 50%.