TY - JOUR
T1 - Numerical Study on the Effects of Tumble and Swirl on Combustion and Emission Characteristics of an LPG Direct Injection Engine
AU - Kim, Hogyeom
AU - Lee, Seung Yeob
AU - Kim, Hyeong Jun
AU - Chung, Jin Taek
N1 - Funding Information:
This study was supported by the Korea LPG Association, the CEFV (Center for Environmentally Friendly Vehicle) as Global-Top Project of KMOE (Ministry of Environment, KOREA), a Korea University Grant, and the BK21 Plus Program (21A20131712520) through the National Research Foundation (NRF) funded by the Ministry of Education of Korea. The authors gratefully acknowledge all of those.
PY - 2020/6/1
Y1 - 2020/6/1
N2 - Recently, global warming caused by greenhouse gases has been highlighted, so many studies have been carried out for developing eco-friendly products. In the vehicle industry, various techniques have been developed for eco-friendly engines. A previous fuel injection system, injecting fuel at the intake port, had difficulty precisely controlling the air/fuel ratio in the cylinder. Therefore, the fuel injection system has been changed to a direct injection system injecting fuel directly inside the cylinder. Due to concerns about fossil fuel depletion and the instability of oil prices, various alternative fuels are currently becoming popular. Liquefied petroleum gas (LPG) is an alternative fuel that has similar characteristics to gasoline. LPG can be used in gasoline engines without sophisticated modification of the engine. For these reasons, the present work focuses on a numerical investigation of the combustion and emission characteristics of LPG direct injection (LPDI) engines by using tumble and swirl. For conducting the simulation, commercial software STAR-CD ver. 4.26 was used. The study was performed at the minimum spark advance for best torque (MBT) of the stoichiometric excess air ratio (λ = 1.0) and the lean-burn excess air ratio (λ = 1.5) with changes in the intake port geometry to induce in-cylinder flow changes.
AB - Recently, global warming caused by greenhouse gases has been highlighted, so many studies have been carried out for developing eco-friendly products. In the vehicle industry, various techniques have been developed for eco-friendly engines. A previous fuel injection system, injecting fuel at the intake port, had difficulty precisely controlling the air/fuel ratio in the cylinder. Therefore, the fuel injection system has been changed to a direct injection system injecting fuel directly inside the cylinder. Due to concerns about fossil fuel depletion and the instability of oil prices, various alternative fuels are currently becoming popular. Liquefied petroleum gas (LPG) is an alternative fuel that has similar characteristics to gasoline. LPG can be used in gasoline engines without sophisticated modification of the engine. For these reasons, the present work focuses on a numerical investigation of the combustion and emission characteristics of LPG direct injection (LPDI) engines by using tumble and swirl. For conducting the simulation, commercial software STAR-CD ver. 4.26 was used. The study was performed at the minimum spark advance for best torque (MBT) of the stoichiometric excess air ratio (λ = 1.0) and the lean-burn excess air ratio (λ = 1.5) with changes in the intake port geometry to induce in-cylinder flow changes.
KW - CFD (Computational fluid dynamics)
KW - Combustion
KW - Excess air ratio (X)
KW - GDI (Gasoline direct injection)
KW - LPDI (Liquefied petroleum gas direct injection)
KW - Swirl
KW - Tumble
UR - http://www.scopus.com/inward/record.url?scp=85079803683&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85079803683&partnerID=8YFLogxK
U2 - 10.1007/s12239-020-0059-y
DO - 10.1007/s12239-020-0059-y
M3 - Article
AN - SCOPUS:85079803683
VL - 21
SP - 623
EP - 632
JO - International Journal of Automotive Technology
JF - International Journal of Automotive Technology
SN - 1229-9138
IS - 3
ER -