中文摘要：

目前纤维过滤介质压力损失的研究大多基于纤维的二维规则排列及低速过滤状态，这与实际过滤介质构造及过滤运行状态存在一定的差异．基于VBA编程，创建三维随机排列纤维过滤介质模型，采用计算流体动力学（CFD）软件模拟计算其内部流场，研究低速及高速过滤状态下压力损失与速度的关系．研究结果表明：模型内部的流体流动呈现线性流区和非线性流区两种流动区域，且两种流动区域的雷诺数临界值为0．33；当流体平均速度大于0．3m／s时，压力损失与流体平均速度不再是简单的线性关系．通过对模拟数据的分析，提出了适合于线性流区及非线性流区的压力损失一流体平均速度关系表达式．

英文摘要：

The pressure drop of fiber filter media was mostly based on unrealistic 2D geometries with the fibers placed regularly and low-filtration state, which was different with the geometry of real fiber filter media and the running-state. Based on VBA programming, a series of 3D fiber filter media models with the fibers arranged randomly were created. Then the flow field was simulated by computational fluid dynamics（CFD） software. Also the relationship between pressure drop and velocity at low-speed and high-speed were analyzed. The research results showed that there were two kinds of flow field regions, the linear flow region and the no-linear flow region, and the critical value of Reynolds of the two regions was 0.33. While the mean velocity of the fluid was large than 0.3 m/s, pressure drop and mean velocity of the fluid was no longer a linear relationship. Finally, a new extensional expression of pressure drop and face velocity of fiber filter media applying to linear flow region and non-linear flow region was obtained.