基于非线性渗流模型采空区漏风流场数值模拟

针对采空区非线性渗流模型中颗粒平均粒径的取值问题，利用专业的流体力学软件fluent对刘庄矿151305工作面采空区不同颗粒粒径下的漏风流场进行了模拟，以此确定合适的平均粒径，并利用该采空区颗粒平均粒径对工作面供风量及采空区漏风的影响进行了模拟与分析。结果表明，采空区内平均粒径的取值对工作面风量分布影响较大，瓦斯抽采负压也相差一个数量级；通过与实测工作面风量及实际的瓦斯抽采负压作对比，当采空区颗粒平均粒径取0.1 m时，模拟结果与现场实际最为吻合；工作面供风量越大，采空区的漏风量也越大，两者为二次函数关系。该研究方法为工作面采空区漏风流场数值模拟提供了理论指导。

Numerical simulation of air leakage flow field in goaf based on nonlinear seepage model

Aiming at the problem of valuing for average particle size in the nonlinear seepage model of goaf, a commercial CFD software, FLUENT, was used to simulate the air leakage flow fields under different particle size in goaf at 151305 working face of Liuzhuang Mine, so as to determine the appropriate average particle size. Then the influence of air volume at working face on the air leakage in the goaf was simulated and analyzed by using the average particle size. The results showed that the value of average particle size in goaf has great influence on the distribution of air volume at the working face, and the difference in negative pressure of gas extraction is an order of magnitude. By comparing with the actually measured air volume at the working face and the actual negative pressure of gas extraction, the simulation result was the most consistent with the actual field when the average particle size was 0.1 m. The more the air volume at working face was, the more the air leakage volume of goaf was, and they presented a quadratic function relationship. It provides theoretical direction for the numerical simulation of air leakage flow field at working face in goaf.