Abstract
Highly pressurized direct injection applied to automotive vehicles was developed for better power and fuel efficiency, but it causes fuel impingement, which generates more soot emissions. In the present study, analyses of the combustion characteristics and fuel impingement were conducted with a direct-injection spark ignition engine using split-injection strategies. Full three-dimensional unsteady Eulerian-Lagrangian two-phase numerical simulations were carried out to predict the flow field and the combustion characteristics as functions of the injection duration ratio and the weight of the second pulse injection. Experimental data were coupled for verification, providing the boundary and initial conditions for the benchmark case. The results showed that the weight of injection became maximally 35% less as the weight of the second pulse injection decreased. The amount of liquid fuel film, which was influenced by the injection duration ratio, had a varying range from approximately 1% to 4%. When a greater amount of the liquid fuel film impinged on the piston surface, this induced more soot formation. However, the fuel-air mixture was the most prominent factor for determining the overall combustion characteristics. A split injection can increase the thermal efficiency and the fuel consumption rate; however, without optimization, poor combustion characteristics such as knocking, incomplete combustion and soot emissions can result.
| Original language | English |
|---|---|
| Pages (from-to) | 1518-1535 |
| Number of pages | 18 |
| Journal | Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering |
| Volume | 227 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - 2013 Nov 1 |
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Keywords
- direct-injection spark ignition
- gasoline direct injection
- liquid fuel film
- split injection
- Spray impingement
ASJC Scopus subject areas
- Mechanical Engineering
- Aerospace Engineering
Cite this
Numerical investigation of the combustion characteristics and wall impingement with dependence on split-injection strategies from a gasoline direct-injection spark ignition engine. / Seo, Juhyeong; Lee, Jae Seong; Choi, Kwan Hee; Kim, Ho Young; Yoon, Suk Goo.
In: Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, Vol. 227, No. 11, 01.11.2013, p. 1518-1535.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Numerical investigation of the combustion characteristics and wall impingement with dependence on split-injection strategies from a gasoline direct-injection spark ignition engine
AU - Seo, Juhyeong
AU - Lee, Jae Seong
AU - Choi, Kwan Hee
AU - Kim, Ho Young
AU - Yoon, Suk Goo
PY - 2013/11/1
Y1 - 2013/11/1
N2 - Highly pressurized direct injection applied to automotive vehicles was developed for better power and fuel efficiency, but it causes fuel impingement, which generates more soot emissions. In the present study, analyses of the combustion characteristics and fuel impingement were conducted with a direct-injection spark ignition engine using split-injection strategies. Full three-dimensional unsteady Eulerian-Lagrangian two-phase numerical simulations were carried out to predict the flow field and the combustion characteristics as functions of the injection duration ratio and the weight of the second pulse injection. Experimental data were coupled for verification, providing the boundary and initial conditions for the benchmark case. The results showed that the weight of injection became maximally 35% less as the weight of the second pulse injection decreased. The amount of liquid fuel film, which was influenced by the injection duration ratio, had a varying range from approximately 1% to 4%. When a greater amount of the liquid fuel film impinged on the piston surface, this induced more soot formation. However, the fuel-air mixture was the most prominent factor for determining the overall combustion characteristics. A split injection can increase the thermal efficiency and the fuel consumption rate; however, without optimization, poor combustion characteristics such as knocking, incomplete combustion and soot emissions can result.
AB - Highly pressurized direct injection applied to automotive vehicles was developed for better power and fuel efficiency, but it causes fuel impingement, which generates more soot emissions. In the present study, analyses of the combustion characteristics and fuel impingement were conducted with a direct-injection spark ignition engine using split-injection strategies. Full three-dimensional unsteady Eulerian-Lagrangian two-phase numerical simulations were carried out to predict the flow field and the combustion characteristics as functions of the injection duration ratio and the weight of the second pulse injection. Experimental data were coupled for verification, providing the boundary and initial conditions for the benchmark case. The results showed that the weight of injection became maximally 35% less as the weight of the second pulse injection decreased. The amount of liquid fuel film, which was influenced by the injection duration ratio, had a varying range from approximately 1% to 4%. When a greater amount of the liquid fuel film impinged on the piston surface, this induced more soot formation. However, the fuel-air mixture was the most prominent factor for determining the overall combustion characteristics. A split injection can increase the thermal efficiency and the fuel consumption rate; however, without optimization, poor combustion characteristics such as knocking, incomplete combustion and soot emissions can result.
KW - direct-injection spark ignition
KW - gasoline direct injection
KW - liquid fuel film
KW - split injection
KW - Spray impingement
UR - http://www.scopus.com/inward/record.url?scp=84890444682&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84890444682&partnerID=8YFLogxK
U2 - 10.1177/0954407013491216
DO - 10.1177/0954407013491216
M3 - Article
AN - SCOPUS:84890444682
VL - 227
SP - 1518
EP - 1535
JO - Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering
JF - Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering
SN - 0954-4070
IS - 11
ER -