掘进巷道油型气扩散规律数值模拟

1.西安科技大学 能源学院,陕西 西安 710054; 2.教育部 西部矿井开采及灾害防治重点实验室,陕西 西安 710054

掘进巷道; 数值模拟; 风流流场; CH4浓度

Numerical simulation of oil-type gas diffusion regularities in roadway excavation
ZHANG Jian-rang1,2,ZHANG Quan1,2,DONG Ding-wen1,2,CHEN Wei1,2

(1.College of Energy Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China; 2.Key Laboratory of Western Mine Exploration and Hazard Prevention,Ministry of Education,Xi'an 710054,China)

heading face; numerical simulation; airflow; CH4 concentration

DOI: 10.13800/j.cnki.xakjdxxb.2015.0306

备注

根据掘进巷道风流流场特点,应用计算流体力学(CFD)软件ANSYS的 Realizable k-ε 双方程模型模拟了掘进工作面的油型气与风流质量混合过程。探讨了掘进工作面风流流场和油型气的主要成分CH4浓度分布规律,对比了油型气在掘进巷道底板不同位置涌出的扩散规律。研究表明,涌出点在涡流内部区域时,油型气与巷道风流混合得更充分; 涌出点距掘进头一定距离之后,油型气涌出后随风流方向运动,且巷道顶部浓度较高; 涌出源为垂直于掘进方向的裂隙时,油型气扩散后CH4浓度在高度上的浓度差较小,裂隙平行于掘进方向时,高度上的浓度差较大。

According to the characteristics of flow field in roadway excavation,a simulation was carried out on mixing procession of airflow and CH4 in heading face with CFD fluent,using Realizable k-ε double equation model.The heading face airflow field and CH4 concentration distribution was discussed.And emission law of oil-type gas at different floor position was compared.The study found that when the point in eddy current region,oil-type gas and airflow mixed more fully.After a certain distance from point to face,oil-type gas moves with the airflow and the concentration decreases from top to bottom.Emission point for the cracks perpendicular to the driving direction,CH4 concentration in the height of the gas diffusion after oil type difference is tiny discrepancy; cracks parallel to the driving direction,the concentration of the height is large differences.