爆破掘进空间内粉尘非稳态运移规律研究

摘要

To promote dust control in underground mine , the unsteady migration laws of dust on blasting excavation face were studied .Based on the basic controlling equations , the RNG k-εturbulence model was established , and the Euler-Lagrangian method was chosen for simulation .3D geometric models of 1100 working face was built and meshed , at the same time , the boundary condition of gas flow field were determined .The motion model of dust was established for unsteady calculation , and the wind speed distribution of gas flow field was obtained by CFD soft-ware.The dispersion law , particle size distribution law , spatial distribution law of dust on the heading face within the range of 60 m were obtained .In addition , the change regulation of dust concentration along the roadway within 50 min after blasting was obtained .%为促进井下粉尘防治工作，对爆破掘进面粉尘非稳态运移规律进行研究。基于控制方程与RNG k-ε湍流模型，选择欧拉-拉格朗日法进行模拟。构建1100工作面三维几何模型并划分网格，确定气相流场边界条件。引入粉尘运动模型进行非稳态计算，利用CFD软件得到气相流场风速分布规律，得出掘进面60 m范围内粉尘沿巷道纵向、垂向扩散规律及巷道沿程粉尘粒径分布规律与空间分布规律。此外，还得到爆破后50min内巷道沿程粉尘浓度随时间变化规律。