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research-article

COMBUSTION MODEL FOR A HOMOGENEOUS TURBOCHARGED GASOLINE DIRECT-INJECTION ENGINE

[+] Author and Article Information
Sedigheh Tolou

Michigan State University, 1497 Engineering Research CT, East Lansing, Michigan, 48824
toloused@egr.msu.edu

Ravi Teja Vedula

Link Engineering Co., 401 Southfield Rd, Dearborn, Michigan, 48120
vedravitej@gmail.com

Harold Schock

Michigan State University, 1497 Engineering Research CT, East Lansing, Michigan, 48824
schock@egr.msu.edu

Guoming George Zhu

Michigan State University, 1497 Engineering Research CT, East Lansing, Michigan, 48824
zhug@egr.msu.edu

Yong Sun

Tenneco Inc., 3901 Willis Rd, Grass Lake, Michigan, 49240
ysun5@tenneco.com

Adam Kotrba

Tenneco Inc., 3901 Willis Rd, Grass Lake, Michigan, 49240
akotrba@tenneco.com

1Corresponding author.

ASME doi:10.1115/1.4039813 History: Received February 27, 2018; Revised March 08, 2018

Abstract

Homogeneous charge is a preferred operation mode of gasoline direct-injection (GDI) engines. However, a limited amount of work exists in the literature for combustion models of this mode of engine operation. Current work describes a model developed to study combustion in a homogeneous charge GDI engine. The model was validated using experimental data from a 1.6L Ford EcoBoost® engine, tested at the U.S. EPA. The combustion heat release was approximated using a double-Wiebe function, to account for the rapid initial pre-mixed combustion followed by a gradual diffusion-like state of combustion, as observed in this GDI engine. Variables of Wiebe correlations were adjusted into a semi-predictive combustion model. The effectiveness of semi-predictive combustion model was tested in prediction of in-cylinder pressures. The root-mean-square errors between experiments and numerical results were within 2.5% of in-cylinder peak pressures during combustion. The semi-predictive combustion model was further studied to develop a predictive combustion model. The performance of predictive combustion model was examined by regenerating the experimental cumulative heat release. The heat release analysis developed for the GDI engine was further applied to a dual mode, turbulent jet ignition (DM-TJI) engine. DM-TJI is a distributed combustion technology with the potential to provide diesel-like efficiencies and minimal engine-out emissions for spark-ignition engines. The DM-TJI engine was observed to offer a faster burn rate and lower in-cylinder heat transfer compared to the GDI engine.

Copyright (c) 2018 by ASME
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