甲烷-煤尘爆炸波与障碍物相互作用的数值研究

为了探讨煤矿瓦斯和煤尘爆炸的物理机制 ,基于对甲烷和煤尘爆炸传播的理论分析 ,采用数值模拟方法研究障碍物对甲烷和煤尘爆炸传播的影响 ;为了更系统地考虑颗粒相各种输运特性、相间滑移和耦合 ,采用双流体模型建立了数学模型 ,该模型的出发点是把颗粒群和气体都作为连续介质 ,两者相互渗透充满整个空间形成没有间隙的“流体”———拟流体 ,在欧拉坐标系下考虑气 -固两相流动 ,气相和颗粒相的计算网格统一 ,易于处理。数值方法采用LU分解和迎风TVD格式分别处理对流项的隐式和显式部分 ,扩散项采用中心差分 ;同时研究了不同形状的障碍物对流场的影响 ,计算结果与实验吻合较好

Study on Numerical Value of Reaction between Barrier and Explosion Wave of Methane-coal Dust

In order to investigate the physical mechanism of methane and coal dust explosion, based on the theoretical analysis of its propagation, the numerical simulation method is used to investigate the impact of barrier on explosion wave propagation. Considering the different transfer characters of particulate distribution, inter-phase slippage and coupling, dual-fluid mode is adopted to build the mathematic model, in which the particles and gases are taken as consecutive medium, and may penetrate each other and fill the whole space to form a“fluid”without slit, so called pseudo-fluid. In the Eulerian coordinate, gas and solid are considered as two phase flow, the calculation of gas phase and particle phase are in uniform grid so that the handling could be simplified. The LU splitting and upwind TVD scheme are used to solve the implicit and explicit part of the convection phase separately, and the central difference is for the dispersed phase. Accordingly the impact of different shaped barriers on flow field is investigated; the calculated results are in well compliance with the experiment results.