Data-Two-dimensional numerical study on particle motion trajectories and deposition in a channel of partial diesel particulate filter

A numerical investigation on the soot laden flow of
gas in a PDPF (Partial Diesel Particulate Filter)
is presented based on solving the momentum equations for
continuous phase in the Euler frame and the motion
equations for dispersed phase in the
Lagrangian frame. The interaction between the gas and particles
is treated as one-way coupling for extremely dilute particle
concentration, while the interaction between particles and porous wall is
implemented through user-defined-subroutines. To accurately track the
motion of nanoscale particles, the drag force, the Brownian excitation,
and the partial slip are included in the particle motion equation. Two
methods are used to verify the gas flow model and reasonable agreement for
both comparisons is observed. The effects of upstream velocity, wall
permeability and particle size on the filtration efficiency and deposition
distribution of the particles along the wall surface of inlet channel are
quantitatively studied. The results show that (1) the wall permeability
plays the most primary role in determining the filtration efficiency of
PDPF; (2) high upstream velocity improves filtration efficiency and drives
the deposition position of particles to the rear of inlet channel; (3) the
dependence of the particle deposition distribution on its own size is
mainly reflected in the initial deposition position; (4) the filtration
efficiency of PDPF is not proportional markedly to the gas flow into inlet
channel at a low wall permeability, implying an intense separation of
particles from gas streamline at the flow entrance.

本文针对部分式柴油颗粒过滤器（Partial Diesel Particulate Filter，PDPF）内负载炭黑的气体流动开展数值研究，基于欧拉坐标系下连续相动量方程与拉格朗日坐标系下离散相运动方程进行求解。针对极低颗粒浓度的工况，气固两相相互作用采用单向耦合处理；颗粒与多孔壁面的相互作用则通过用户自定义子程序实现。为精准追踪纳米尺度颗粒的运动，颗粒运动方程中纳入了曳力、布朗激励与部分滑移效应。本文采用两种方法对气体流动模型进行验证，结果显示两种对比均取得了合理的一致性。本研究定量分析了上游流速、壁面渗透率与颗粒粒径对进气通道壁面处颗粒过滤效率及沉积分布的影响，结果表明：（1）壁面渗透率是影响PDPF过滤效率的最核心因素；（2）较高的上游流速可提升过滤效率，并推动颗粒沉积位置向进气通道后部偏移；（3）颗粒沉积分布随自身粒径的变化主要体现在初始沉积位置上；（4）在壁面渗透率较低的工况下，PDPF的过滤效率与流入进气通道的气体流量并非呈显著正比关系，这意味着气流入口处颗粒与气体流线发生了强烈分离。

搜集汇总

背景与挑战

背景概述

该数据集包含关于柴油机部分颗粒过滤器（PDPF）中颗粒运动轨迹和沉积的二维数值研究数据，重点研究了上游速度、壁面渗透性和颗粒大小对过滤效率和沉积分布的影响。研究采用欧拉框架和拉格朗日框架分别求解连续相和分散相的动量方程，并通过用户自定义子程序处理颗粒与多孔壁的相互作用。