长径比对颗粒物捕集器压降交点及内部流场的影响

doi:10.13229/j.cnki.jdxbgxb.20221648

摘要/Abstract

摘要：

本文通过建立DPF一维及三维1/4孔道离散相模型，研究了长径比对ACT与SCT载体的压降交点、内部流场及颗粒物沉积迁移规律的影响。结果表明：灰分量提高、进气流量降低会使ACT与SCT载体的压降交点减小；SCT载体在高长径比（1.6）时压降特性更优，反之则ACT载体；ACT载体进/出口孔道气流速度均高于SCT载体，高长径比载体进口孔道气流速度明显高于低长径比载体，出口孔道气流速度则相反；颗粒在孔道壁面沉积呈现明显的前少后多不均匀性，长径比增大可提高载体的颗粒物捕集效率，本文研究结果可为农用柴油机DPF选型提供科学理论指导，具有一定的工程应用价值。

关键词: 动力机械及工程, 柴油机颗粒物捕集器, 压降, 非对称载体, 内部流场, 颗粒沉积

Abstract:

In this study， the influence of aspect ratio on the pressure drop intersection， internal flow field， and particle deposition of ACT and SCT carriers were investigated. 1D and 3D 1/4 orifice discrete phase models of DPF were established. The results showed that with the increase of the ash content and the decrease of the inlet flow rate， the pressure drop intersection point of ACT and SCT carriers decreased. High aspect ratios （1.6） resulted in better pressure drop characteristics for SCT carriers， while low aspect ratios were better for ACT carriers. The airflow velocity in the inlet/outlet orifice of ACT carriers was higher compared to that of SCT carriers. High aspect ratio carriers had significantly higher airflow velocity in the inlet orifice， while the velocity in the outlet was lower. The particle deposition on the wall of the pore channel was uneven. Increasing the aspect ratio of the carrier improved the particle trapping efficiency. The results of this paper can provide scientific and theoretical guidance for the selection of DPF for agricultural and have certain engineering application value.

Key words: power machinery and engineering, diesel particulate filter, pressure drop, asymmetric carrier, internal flow field, particle deposition

中图分类号:

TK421+.5

魏明亮,李志丹,田波,李青,颜伏伍,王宇. 长径比对颗粒物捕集器压降交点及内部流场的影响[J]. 吉林大学学报(工学版), 2024, 54(11): 3125-3134.

Ming-liang WEI,Zhi-dan LI,Bo TIAN,Qing LI,Fu-wu YAN,Yu WANG. Effect of length-to-diameter ratio on DPF pressure drop intersection point and internal flow field[J]. Journal of Jilin University(Engineering and Technology Edition), 2024, 54(11): 3125-3134.

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参数	数值
目数	300
材料	碳化硅
容积/L	4.56
载体长度/mm	203
载体直径/mm	169
壁厚/mm	0.254
对称载体孔径/mm	1.21
非对称载体进口孔径/mm	1.371
非对称载体出口孔径/mm	1.055

发动机指标	技术参数
发动机型式	直列4缸、增压中冷、高压共轨系统
缸径/mm×行程/mm	95×105
排量/L	2.977
额定功率/kW	110（3 200 r·min^-1）
最大扭矩/（N·m）	400（1 600~2 600 r·min^-1）

参数	数值
气相密度/（kg·m^-3）	0.5
气体粘度/（Pa·s）	3.3×10^-5
孔隙率	0.435 8
壁厚/mm	0.254
入口速度/（m·s^-1）	58.95
颗粒直径/mm	0.000 1
壁面渗透率/m²	3.35e^-13

参数	数值
发动机转速/（r·min^-1）	2 000
入口流量/（kg·h^-1）	431.9
DPF入口温度/℃	474.3
DPF出口压力/kPa	101
DPF出口温度/℃	19.8
颗粒入射速度/（m·s^-1）	58.95

参数	数值
碳载量/（g·L^-1）	6
灰分量/（g·L^-1）	12.5
灰分分布系数M	0.3
进气流量/（kg·h^-1）	431.9
长径比L/D	1.2 & 1.6
载体结构	对称 & 非对称