【摘要】 采用FLUENT软件对喷动床和喷动流化床这种严格轴对称的柱锥体进行数值模拟时,常见气相场的伪收敛或伪扩散,且出现流场不对称现象。从网格结构的角度,提出了一种采用非一致性网格并沿柱体的轴向与锥体入口尺寸相当的区域进行网络加密的改进方法。基于这种网格改进,对喷动床和喷动流化床的气相场进行了数值模拟,并在相应的试验装置上对模拟结果进行试验。结果表明,该网格改进对柱锥体有较好的通用性。更多还原

【Abstract】 Some asymmetric phenomena usually occur when using FLUENT software to numerically simulate such strictly axisymmetric column-cone objects as spouting bed and spouting fluidized bed,the pseudo-convergence and pseudo-diffusion of commonly occurred gas-phase field has also phenomenon of asymmetric flow field.From view point of the lattice structure,an improvement of the lattice has been put forward to adopt non-consistent lattice and increase the density of lattice along the axial direction of column and in the area corresponding to size of the cone inlet.Based on the improvement of lattice,numerical simulation of the gas-phase field for spouting bed and spouting flurdized bed has been carried out,and test of simulated results being made in the corresponding test system.The result shows that the improvement of lattice is feasible,and has better universality for the column-cone objects.更多还原