Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (7): 1892-1901.doi: 10.13229/j.cnki.jdxbgxb.20211038

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Analysis of diesel particulate filter channel flow field and its noise characteristics in plateau environment

Gui-sheng CHEN1,2(),Guo-yan LUO1,2,Liang-xue LI1,2,Zhen HUANG1,2(),Yi LI3   

  1. 1.College of Transportation Engineering，Kunming University of Science and Technology，Kunming 650500，China
    2.Yunnan Key Laboratory of Internal Combustion Engine，Kunming University of Science and Technology，Kunming 650500，China
    3.Yunnan Filter Environment Protection Science & Technology Corporation Limited，Kunming 650300，China
  • Received:2021-10-11 Online:2023-07-01 Published:2023-07-20
  • Contact: Zhen HUANG E-mail:cgs_yly@163.com;1329627964@qq.com

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Abstract:

A 3D model of Diesel Particulate Filter（DPF） was established by CFD software， the influence of soot and ash distribution on the airflow movement of dissymmetric DPF ducts was studied. A one-dimensional thermodynamic model of engine was used to analyze influence of the DPF carries size， wall thickness， and the inlet/outlet aperture ratio on exhaust noise under plateau environment. The results showed that： the flow velocity of DPF inlet port has been increases first and then decreases axially from the beginning end. The flow velocity of the DPF inlet port has been decreases radially from the center. The carrier diameter has significant impact on noise than the length under plateau environment. The carrier diameter of 190 mm has a better noise attenuation effect than the diameter of 170 mm， reaching more than 3 dB. The inlet/outlet aperture ratio is 1.1， the end of DPF noise is the lowest， the attenuation amplitude increases with the increase in carbon loading （0~8 g/L）， the noise attenuation effect is better more than 3 dB.

Key words: power machinery and engineering, diesel engine, computational fluid dynamics（CFD）, diesel particulate filter（DPF）, plateau environment, noise characteristics, channel flow field, ash distribution coefficient

CLC Number: 

  • TK442

Table 1

Engine specifications"

参 数具体数值
发动机机型直列4缸四冲程
燃油系统电控高压共轨
进气形式增压中冷
压缩比16.6
排量/L2.977
额定功率/kW100/（3000 r·min-1）
最大转矩/（N·m）381/（1600~2600 r·min-1）

Table 2

DPF specifications"

参 数具体数值
材质碳化硅
直径×长度/mm×mm170×200
配比1.5
孔密度/CPSI300
孔隙率/%43
孔径分布/μm5~32
壁厚/mm0.2525

Fig.1

DPF exhaust noise diagram"

Fig.2

DPF micro channel model"

Fig.3

DPF channel grid model"

Fig.4

DPF inlet/exhaust channel centerlinedimensionless velocity verification"

Fig.5

Comparison between experiment and simulationof DPF noise"

Fig.6

Noise spectrum diagram"

Fig.7

Flow rate variation diagram of inlet passage"

Fig.8

Diagram of flow rate variation in exhaust channel"

Fig.9

Velocity changes of DPF inlet center line"

Fig.10

Center line velocity changes of the DPF outlet channel"

Fig.11

DPF inlet flow velocity changes along radialposition"

Fig.12

DPF outlet flow velocity changes along radialposition"

Fig.13

Insertion loss of DPF"

Fig.14

Influence of carrier size on DPF noise"

Fig.15

Influence of wall thickness on noise of DPF"

Fig.16

Influence of inlet and outlet aperture on DPFnoise"

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