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Performance of Broken Participate Filters-a 1D and 3D Simulation Study

机译：破损参与过滤器的性能-A 1D和3D模拟研究

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摘要

The filtration efficiency of locally damaged particulate filters is investigated by means of 1D and 3D-CFD simulation. A model splits the filter into a regular and a damaged region. The regular part is modeled as a conventional wall flow filter and the damaged region is mimicked by a front plugged partial flow filter. The model equations are summarized, and the different types of boundary conditions are discussed. A method to combine 1D models of regular and damaged filter sections is presented. Two 1D models are combined using a flow apportioning parameter aiming at describing the full 3D filtration efficiency of the broken filter. Validation simulations of a front and rear plugged partial flow filter are performed. Four types of differently damaged filters are simulated in 1D and 3D-CFD at fifteen operating conditions representing different mass flows and initial soot loadings. The filtration efficiencies depending on the operating conditions are discussed. The filtration efficiencies calculated in 1D and 3D-CFD show relative deviations in a low percentage range. This comparison reveals that the presented flow apportioning method enables 1D simulations to assess 3D phenomena while keeping real-time computational efforts. The added value of 3D-CFD is presented by flow contours showing how the spatial positioning of damaged regions influences the flow non-uniformities in the inlet cone of the filter. Wall flow filter, partial flow filter, filter damage, filtration efficiency, 1D/3D aftertreatment simulation, flow apportioning parameter.
机译：通过1D和3D-CFD模拟研究了局部受损颗粒过滤器的过滤效率。模型将过滤器分成常规和损坏的区域。常规部分被建模为传统的壁流滤波器，并且损坏的区域由前堵塞的部分流过滤器模拟。概述了模型方程，并讨论了不同类型的边界条件。提出了一种结合常规和损坏滤波器部分的1D模型的方法。使用用于描述破碎滤波器的全3D过滤效率的流程分配参数来组合两个1D模型。执行前后插入部分流过滤器的验证模拟。在1D和3D-CFD中模拟了四种类型的不同损坏的滤波器，其十五是表示不同质量流动和初始烟灰载荷的15个操作条件。讨论了根据操作条件的过滤效率。在1D和3D-CFD中计算的过滤效率显示出低百分比范围的相对偏差。该比较揭示了所呈现的流量分配方法，使1D模拟能够评估3D现象，同时保持实时计算努力。 3D-CFD的附加值由流量轮廓显示，示出了损坏区域的空间定位如何影响过滤器的入口锥中的流动不均匀性。墙面流动滤波器，部分流量滤波器，过滤器损坏，过滤效率，1D / 3D后处理仿真，流量分配参数。

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