Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (1): 39-48.doi: 10.13229/j.cnki.jdxbgxb20190938

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Analysis on particle collision dynamics parameters in diesel exhaust stage

Zhong WANG1(),You LI1,Mei-juan ZHANG1,2,Shuai LIU1,Rui-na LI1,Huai-bei ZHAO1   

  1. 1.School of Automotive and Traffic Engineering，Jiangsu University，Zhenjiang 212013，China
    2.School of Automotive and Traffic，Wuxi Institute of Technology，Wuxi 214121，China
  • Received:2019-10-10 Online:2021-01-01 Published:2021-01-20

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Abstract:

In order to explore the dynamic characteristics of particle collision in diesel engine exhaust phase， a simulation model of particle collision was established by coupling discrete element dynamics software EDEM with Fluent based on similarity theory. The collision process of diesel engine with different exhaust pressure difference and flow velocity were simulated. The effects of collision dynamics parameters such as angular velocity， rotational turbulent kinetic energy， torque and collision scraping force on the diesel engine during collision were analyzed. The results show that the normal force and tangential force increase by 1.5 and 1.7 times respectively when the velocity of flow is constant， the particle size is the same and the exhaust pressure difference increases from 0.188 MPa to 0.268 MPa， and the average rotational turbulent kinetic energy increases from 2.26×10-9 J to 3.52×10-9 J. When the pressure difference is constant， the particle size is the same and the gas flow rate increases from 5.65 m/s to 6.78 m/s， the normal force and tangential force increase by 50.5% and 45.5% respectively， and the average angular velocity of particles increases from 7.87×105 rad/s to 10.85×105 rad/s. The research results can provide a basis for improving diesel particulate filter （DPF） capture efficiency.

Key words: power machinery engineering, diesel engine, exhaust stage, particle, collision, dynamics

CLC Number: 

  • TK421

Fig.1

Simplified view of 186FA diesel engine inlet"

Table 1

Physical parameters of prototype and model particle"

颗粒粒径/nm质量密度/(kg·m-3)温度/K相似指标/R
原型100120010000.83~0.90
模型1.0×105310683
1.5×105232625
2.0×105165565
2.5×105101503

Fig.2

186FA diesel engine test bench"

Fig.3

Scanning electron microscopy and SEM of particle"

Fig.4

Cylinder pressure curve of 186FA diesel engine under different loads"

Table 2

Piston up speed of each characteristic angle in exhaust phase"

转速/

(r?min-1)

各特征转角活塞上行速度/(m?s-1)
180 °CA270 °CA360 °CA
3000011.300
3300012.440
3600013.560

Fig.5

Iteration curve"

Fig.6

Changes of particle angular velocity, rotating turbulent kinetic energy and torque with pressure difference"

Fig.7

Curve of particle scratch force with pressure difference"

Fig.8

Changes of particle angular velocity, rotating turbulent kinetic energy and torque with different flow rate"

Fig.9

Curve of particle scratch force with flow rate"

Fig.10

Changes of particle angular velocity, rotating turbulent kinetic energy and torque with particle size"

Fig.11

Curve of particle scratch force with particle size"

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