独头巷道受限贴附射流流场特征模拟实验研究  

Simulation on Flow Field Characteristic of Restricted Wall-attached Jet in Heading Face

作　　者：王海桥[1] 刘荣华[1] 陈世强[1] 

机构地区：[1]湖南科技大学能源与安全工程学院,湖南湘潭411201

出　　处：《中国工程科学》2004年第8期45-49,63,共6页Strategic Study of CAE

基　　金：国家自然科学基金资助项目 ( 5 99740 2 2 )

摘　　要：独头巷道压入式通风是有限空间的受限贴附射流。基于流体动力学和射流理论 ,建立了独头巷道压入式受限贴附射流通风的紊流k -ε数学模型 ,分析了计算边界条件 ,并应用PHOENICS3 4计算流体动力学(CFD)软件模拟了独头巷道射流通风三维流场 ,得出了独头巷道有限空间受限贴附射流通风流场分区、射流起始段、射流贴附过程及射流流速变化规律等流场特征。模拟计算结果表明 ,独头巷道压入式通风流场可分为贴附射流区、冲击射流贴附区、回流区和涡流区 ,受限贴附射流起始段小于贴附自由射流起始段。射流完全贴附后 ,射流壁面轴心速度大于出风口轴心速度。数值模拟与实验结果相符 ,为研究独头巷道风流传质过程。Pressed ventilation in heading face is actually a restrained wall-attached jet ventilation in confined space. In this paper, based on hydrodynamic and jet theory, the turbulence k-ε model of restrained wall-attached jet ventilation in heading face is set up and calculation boundary is analyzed. Combining with practice,and using PHOENICS3.4 software of computational fluid dynamics (CFD),three-dimensional airflow field of the jet ventilation in heading face is simulated.The flow field characteristics such as the flow field zoning,the starting segment of jet, the attaching course of jet and the changing pattern of jet velocity are obtained by numerical simulation. According to result of numerical simulation, there are four zones in heading face, i.e. wall-attached jet zone, impact jet wall-attached zone, back flow zone and eddy zone. The starting segment length of attached jet is shorter than thar of free attached jet. After wall-attached jet formed completely, the axis velocity of wall is higher than that in air outlet. The result of numerical simulation agrees with that of experiment,which provides a dependable basis for further study of the air mass transport process, the reason of methane accumulation and the efficiency of air displacement in heading face.

关 键 词：独头巷道 受限贴附射流 κ-ε模型 数值计算 

分 类 号：TD724.4[矿业工程—矿井通风与安全]