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基于实际熔喷纤维电镜扫描(SEM)图像,建立了不同褶间角、层数、直径、纤维个数、曲率的褶型空气过滤介质微观结构模型,实现了对褶型空气过滤介质微观结构的动态控制.通过计算流体力学和离散单元法(CFD-DEM)耦合的方法对褶型过滤介质含尘过滤阶段的过滤特性进行模拟,将模拟结果与相关经验关联式比较.结果表明,所建模型与实际过滤介质电镜图像基本相似,压力损失模拟值与计算值误差在10%以内,表明CFD-DEM耦合计算方法可行;在含尘过滤阶段,同一进口风速(v)下随颗粒沉积量增加,压力损失非线性增大;不同进口风速下的压力损失增加均随过滤时间增加而增大,v=0.6 m/s时压力损失增加最大,为0.214 Pa,v=0.4 m/s时压力损失增加最少,为0.133 Pa.当3.216 ms时,颗粒出现明显沉积与团聚,纤维彼此贯穿的区域沉积更明显,表明纤维的排列方式对颗粒的沉积影响显著.
Based on the actual melt-blown fiber electron microscopy (SEM) images, the microstructure model of pleated air filtration media with different pleats angle, layer number, diameter, fiber number and curvature was established, and the microstructure of pleated air filtration media Dynamic control.The filtration characteristics of pleated filter media during the dust filtration stage were simulated by the method of computational fluid dynamics and discrete element method (CFD-DEM) coupling.The simulation results were compared with the correlation empirical correlation.The results show that the model The results show that the CFD-DEM coupling method is feasible. In the stage of dust filtration, the particle deposition rate increases with the same inlet velocity (v) The pressure loss increases nonlinearly with the increase of filtration time. The pressure loss increases with the increase of filtration time when v = 0.6 m / s, which is 0.214 Pa. When v = 0.4 m / s, the pressure loss increases With a minimum of 0.133 Pa. At 3.216 ms, the grains were obviously deposited and agglomerated, and the deposition of the fibers penetrated each other was more obvious, indicating that the arrangement of fibers had a significant effect on the deposition of the grains.