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http://dx.doi.org/10.7467/KSAE.2015.23.4.402

Quasi-dimensional Analysis of Combustion and Emissions in a Stratified GDI Engine under Ultra-lean Conditions  

Lee, Jaeseo (Department of Mechanical Engineering, Pohang University of Science and Technology)
Huh, Kang Yul (Department of Mechanical Engineering, Pohang University of Science and Technology)
Kwon, Hyuckmo (Powertrain Thermo-Fluid CAE Team, Hyundai Motor Company)
Park, Jae In (Powertrain Thermo-Fluid CAE Team, Hyundai Motor Company)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.23, no.4, 2015 , pp. 402-409 More about this Journal
Abstract
In this study a quasi-dimensional model is developed to predict the combustion process and emissions of a GDI engine under ultra-lean conditions. Combustion of a GDI engine condition is modeled as two simultaneous processes to consider significant fuel stratification. The first process is premixed flame propagation described as burning in a hemispherically propagating flame. The second is diffusion-controlled combustion modeled as mixing of multiple spray zones in the burned gas region. Mixing is an important factor in ultra-lean conditions leaving stratified mixture of developing sprays behind the propagating premixed flame. Sheet breakup and Hiroyasu models are applied to predict the velocity of a hollow cone spray. Validation is performed against measured pressures and NOx and CO emissions at different load and rpm conditions in the test engine.
Keywords
Quasi-dimensional analysis; GDI engine; NOx; CO;
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