Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (11): 3125-3134.doi: 10.13229/j.cnki.jdxbgxb.20221648

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Effect of length-to-diameter ratio on DPF pressure drop intersection point and internal flow field

Ming-liang WEI1,2(),Zhi-dan LI1,2,Bo TIAN3,Qing LI3,Fu-wu YAN3,Yu WANG3   

  1. 1.State Key Laboratory of Intelligent Agricultural Power Equipment，Luoyang 471039，China
    2.Luoyang Tractor Research Institute Co. ，Ltd. ，Luoyang 471039，China
    3.School of Automotive Engineering，Wuhan University of Technology，Wuhan 430070，China
  • Received:2023-01-01 Online:2024-11-01 Published:2025-04-24

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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

CLC Number: 

  • TK421+.5

Fig.1

One-Dimensional pressure drop model"

Table1

Carrier structure parameters"

参数数值
目数300
材料碳化硅
容积/L4.56
载体长度/mm203
载体直径/mm169
壁厚/mm0.254
对称载体孔径/mm1.21
非对称载体进口孔径/mm1.371
非对称载体出口孔径/mm1.055

Fig.2

ACT carrier internal pore structure"

Fig.3

Pressure crop composition of DPF"

Table 2

Main parameters of D30 TCI engine"

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/mm95×105
排量/L2.977
额定功率/kW110（3 200 r·min-1）
最大扭矩/（N·m）400（1 600~2 600 r·min-1）

Fig.4

Model validation results"

Fig.5

DPF 1/4 channel model and grid model"

Table 3

Related parameters of flow model"

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/mm0.254
入口速度/（m·s-1）58.95
颗粒直径/mm0.000 1
壁面渗透率/m23.35e-13

Table4

Calculation parameters of microscopic channel flow model"

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/kPa101
DPF出口温度/℃19.8
颗粒入射速度/（m·s-1）58.95

Fig.6

Simulation values compared with the literature values［16］"

Fig.7

Effect of mass flow rate on the pressure drop characteristics of ACT/SCT"

Fig.8

Effect of aspect ratios on the pressure drop characteristics of ACT and SCT"

Table 5

Working condition parameter"

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M0.3
进气流量/（kg·h-1）431.9
长径比L/D1.2 & 1.6
载体结构对称 & 非对称

Fig.9

Effect of carrier structure on air flow movement in DPF channel"

Fig.10

Effect of carrier structure on air flow movement in DPF channel"

Fig.11

Effect of carrier structure on velocity at the center of the channel"

Fig.12

Effect of carrier structure on air flow pressure in DPF channel"

Fig.13

Effect of carrier structure on air flow pressure in DPF channel"

Fig.14

Effect of carrier structure on the pressure at the center of the channel"

Fig.15

Effect of carrier structure on particle velocity in DPF channel"

Fig.16

Effect of carrier structure on particle concentration distribution in axial direction of DPF"

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