移动坐标下采空区流场及遗煤瓦斯浓度场分布

Air-flowing field and gas-concentration field of the coal left in goaf based on the moving coordinate

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 laws of air-flowing field and gas-volume-concentration field of the coal leR m goat; numericalsimulation and field measurement were adopt. Through using the interface named UDF, the coal face advancing process was added in CFD calculation model. Based on the moving coordinate, gas percolation model of the left mine in goaf was built. The results of the numerical simulation contains some comparison with the measured results of gas emission of 20130 fully mechanized coal face with U-tube ventilation system in No. 10 mine of Pingdingshan Coal Mining Corp. The results showed that high advancing speed of coal face and small air quantity of coal face leaded to high gas-volume-concentration in mining roadways and goaf. The results of numerical simulation was consistent with the measured results, which could be used to reflect the actual situation on site.