摘要
在U型通风方式下,以CFD数值模拟软件为手段,对工作面采掘空间的流场分布和瓦斯浓度分布规律、空气密度变化规律进行了数值模拟研究。模拟试验结果表明:沿风流自进风巷、工作面至回风巷的过程中,风流场变化呈先简单、后复杂、再简单的趋势,在进风巷和回风巷与工作面采掘空间交叉处,风流场变化最复杂;工作面采掘空间的瓦斯浓度沿风流方向呈逐渐增加趋势,仅在局部位置发生较大变化,且煤壁侧的瓦斯浓度明显高于采空区侧瓦斯浓度;U型通风条件下,工作面靠近进风巷端部靠近煤壁侧和上隅角瓦斯集聚区最可能出现局部瓦斯超限的区域;上隅角瓦斯集聚区形状呈三角形。
Under the conditions of U-type ventilation,the numerical simulation on the characteristics of flow field,the distribution of methane density and the rule of air density change are studied by numerical simulation software of CFD at the mining face spaces.The simulations show that from intake airflow into roadway,working face and to return airway,the characteristics of airflow field shows to be simple firstly,complex next and simple again.The flow field is the most complex at the crossing of the intake airflow roadway and the return airway; The gas concentration at working face space shows gradually increasing along the airflow direction with larger variety only appearing at local position,and gas concentration along coal wall is higher than that along mining-out area; Under the condition of U-type ventilation,gas can be easily accumulated to be the highest level around the top of intake airflow roadway close to coal wall and the upper corner,and the gas concentration at the upper corner is triangle in shape.
出处
《金属矿山》
CAS
北大核心
2010年第10期151-153,180,共4页
Metal Mine
基金
国家自然科学基金重点项目(编号:50834005)
国家自然科学基金项目(编号:50974123)
煤炭资源与安全开采国家重点实验室开放课题(编号:SKLCRSM09KFB09)
中央高校基本科研业务费资助项目(编号:2009QZ03)
关键词
U型通风
CFD
流场特性
瓦斯分布规律
U-type ventilation
CFD
Flow field characteristics
Methane distribution characteristics
