基于规则Sierpinski地毯结构模型的CaO孔道流动特性模拟

CaO Pore Fluidization Simulation Based on the Inerratic Sierpinski Structure Model

基于规则分形结构—Sierpinski地毯结构建立二维分形孔道模型,采用SIM-PLEC算法和k-ε模型,应用Fluent 6.3模拟孔道内流体流动规律,包括流场内速度、压力、气含率和流量,为研究真实CaO孔道内流体流动提供数据。模拟结果表明,气体在Sierpinski地毯结构中流动具有分形特性、对称性和随机性;进口气速与总压降成线性关系;进口气速不影响流场内压力、速率分布;在障碍物后方形成了空气的漩涡,气速越大,漩涡范围越小,且形状趋于规则圆形;不同级数的地毯模型压力、速率分布一致,且2级模型是3级模型的一部分。

2-D fractal pore model was built based on the inerratic fractal structure-Sier- pinski carpet structure. The fluid flow characteristics including gas velocity, pressure, gas holdup and flow rate in the pore were simulated by Fluent 6.3 and SIMPLEC algo- rithm and κ-ε model. These investigations can provide some reference dates for the fluid flow in the real CaO pore. The simulation results show that the gas flow has fractal characteristics, symmetry and random in the Sierpinski carpet structure. It appears line- ar relationship between inlet gas-velocity and total pressure drop. The inlet gas-velocity can not affect the pressure distribution and the speed distribution in the flow field. There are some vortexs of air behind the obstacles, the bigger of the inlet gas-velocity, the smaller of the vortex range, and the shape tends to inerratic round. The pressure distribution or the speed distribution was consistent with different level models, and the 2 level model is a part of the 3 level model.