贯通巷道风流流场数值模拟若干关键问题研究

根据计算流体力学基本理论,利用计算流体动力学(CFD)软件Fluent,运用三维k-ε湍流模型对贯通型巷道风流流场数值模拟中风流入口、出口位置对巷道风流流场分布的影响、湍动能k及湍动能耗散率ε的取值对模拟结果的影响等进行考察。通过研究确定模拟巷道的流体力学入口长度,确定模拟巷道出口位置;湍动能k及湍动能耗散率ε的取值对入口附近流动还没有充分发展区域拟解算的结果影响较大,而对流动充分发展的区域影响较小。将数值模拟风速值与理论计算风速值进行对比,模拟结果与计算结果非常一致,验证了数值模拟方法的正确性,为研究贯通型巷道风流传质过程、瓦斯运移规律及通风排污效率等提供了理论基础。

Research of Several Key Problems in Numerical Simulation of Flow Field of Perforation Airway

Based on the foundational theory of CFD(Computational Fluid Dynamics),the influence of velocity inlet and outlet on velocity field in airway with airflow through was studied with three-dimensional turbulence model by Fluent software.The affect of turbulence energy and dissipation rate on simulation results of airflow field in roadway was investigated.On the basis of this study,the entry region length and exit region length was determined.It shows that the influence of the selection of turbulence energy and dissipation rate on simulation results of airflow field is great in non-fully-developed turbulent region,and small in fully developed turbulent region.The simulation results fit well with the theoretical one.The research provides a dependable basis for further studying the air mass transport process,the rules of methane accumulation and the efficiency of air displacement in airway with airflow through.