A Study on EGR Utilization in Natural Gas SI Engines Using a Two-Zone Combustion Model

2007-01-2041

07/23/2007

Event
JSAE/SAE International Fuels & Lubricants Meeting
Authors Abstract
Content
In this study, a computer model of the four-stroke, spark-ignition natural gas engine thermodynamic cycle was developed. This model was constructed based on the mass and energy conservation principles and the combustion process was analyzed using a two-zone combustion model. The combustion angle was calculated by using relationships derived from a turbulent model. In addition, a kinetic model based on the extended Zeldovich mechanism was developed in order to show the ability of Exhaust Gas Recirculation (EGR) on reducing NO emissions. Furthermore, a knocking model was incorporated with the two-zone combustion model in order to predict any auto-ignition that might occur. The aim of this study is to investigate the effect of adding EGR to a stoichiometric mixture on engine performance and NO emissions under several inlet conditions. It was found that using EGR in cooled supercharged inlet conditions (333 K and 250 kPa) can reduce both NO emission and fuel consumption by about 80%, and 19 to 27% (depending on engine speed) respectively compared to a stoichiometric non EGR mixture condition.
Meta TagsDetails
DOI
https://doi.org/10.4271/2007-01-2041
Pages
10
Citation
Ibrahim, A., Bari, S., and Bruno, F., "A Study on EGR Utilization in Natural Gas SI Engines Using a Two-Zone Combustion Model," SAE Technical Paper 2007-01-2041, 2007, https://doi.org/10.4271/2007-01-2041.
Additional Details
Publisher
Published
Jul 23, 2007
Product Code
2007-01-2041
Content Type
Technical Paper
Language
English