中文摘要：

建立了用于过滤燃烧数值模拟的大孔穴多孔介质3-D均质网络模型。利用该模型研究了四组不同参数多孔介质内压力梯度与渗流速度之间的变化规律。数值模拟与实验结果吻合得很好。数值计算表明：相对于孔隙率,孔径亦即渗透率对压力梯度的影响更为显著;入口效应仅局限在距入口界面2～3个单元长度内,几何参数和渗流速度对其影响可以忽略;多孔介质的存在抑制了湍动能的发展,在受入口效应影响的区域,湍动能衰减得比较剧烈,之后变化趋缓,最终与耗散率形成动态平衡。

英文摘要：

A new 3-D homogeneous network model is constructed for simulation of combustion in the big-cavity porous media.The relationship between the pressure gradient and the Darcean velocity was investigated in the simulation,which showed a good agreement with experimental data.Compared with the porosity,the effect of the pore size,i.e.the permeability,on the pressure gradient is more significant.The entrance effect is only limited within the 2 to 3 cell units from the entrance,and the geometric parameters and Darcean velocity play little role in the entrance effect.The existence of porous media suppresses the development of turbulent kinetic energy,which decays dramatically within the region affected by the entrance effect,then changes moderately and comes to a balance with its dissipation rate at the end.