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为揭示“U”型通风方式下采空区流场及遗煤瓦斯体积浓度场分布规律,采用数值模拟与现场实测对比验证的方法进行研究,利用UDF接口将工作面推进过程添加到CFD计算模型中,建立基于移动坐标下的采空区遗煤瓦斯渗流计算模型,将数值模拟结果与平顶山煤业(集团)公司十矿“U”型通风下20130综采工作面瓦斯涌出实测结果进行对比分析.研究结果表明:工作面推进速度越快、工作面进风巷风速越小,采空区瓦斯体积浓度和回风巷瓦斯体积浓度越高,数值模拟结果与现场实测结果相一致,验证了数值模拟结果能够真实反映实际现场情况.
In order to reveal the distribution law of the flow field in the goaf and the gas concentration concentration field in the “U” ventilation mode, the method of numerical simulation and on-the-spot field comparison was used to study the method. The UDF interface was used to add the working face advancement to the CFD In the calculation model, the seepage calculation model of coal sequestration in goaf under moving coordinates is established. The numerical simulation results are in good agreement with the gas emission of 20130 fully mechanized coal mining face under ventilation of “U” of Pingdingshan Coal Industry (Group) Corporation The results show that: the faster the working face advancing, the smaller the wind speed in the air inlet of work face, the higher the gas volume concentration in gob and the gas concentration in return airway. The numerical simulation results are in good agreement with the field measurements Consistent, verify the numerical simulation results can truly reflect the actual scene.