摘要
根据多孔介质渗流理论,利用计算流体力学软件Fluent,设定采空区渗透率为均匀分布、分段均匀分布和连续性分布,分别模拟这3种情况的采空区漏风流场。当渗透率均匀分布时漏风量小,自燃带靠近工作面。渗透率分段均匀分布时,速度在分区界面上产生跳跃。采空区渗透率连续分布条件下的漏风分布与假设分段均匀分布和均匀分布条件下的漏风量、漏风风速分布和自燃三带的位置和宽度有很大差别。结果表明,只有采用更能如实反映采空区岩石冒落和压实规律的渗透率分布,得到的采空区的风流流动规律才更符合实际。
According to the percolation theory of porous media,setting gob permeability as uniform distribution,sub-uniform distribution and continuous distribution,the computational fluid dynamics software Fluent is applied respectively to simulate the distribution of air leakage in gob at various supposes of permeability distribution.When gob permeability is uniform distribution,quantity of air leakage is small and spontaneous combustion zone is close to the working face.Sub-uniform distribution permeability leads that the air leakage velocity jumps at the boundary of zones.The quantity of air leakage and distribution of air velocity,three zones of spontaneous combustion vary largely under condition of different distributions of permeability,that is,uniform distribution,sub-uniform distribution and continuous distribution.It shows that accurate distribution of permeability should be considered carefully as precise as possible in order to get the distribution in gob.
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2010年第3期81-85,共5页
China Safety Science Journal
基金
长江学者和创新团队发展计划(IRT0618)
关键词
渗透率
漏风
流场
数值模拟
采空区
permeability
air leakage
airflow field
numerical simulator
gob
