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Energies 2018, 11(3), 515; https://doi.org/10.3390/en11030515

Numerical Investigation on Effects of Assigned EGR Stratification on a Heavy Duty Diesel Engine with Two-Stage Fuel Injection

1
School of Automotive Engineering, Harbin Institute of Technology, Weihai 264209, China
2
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
3
State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130025, China
*
Author to whom correspondence should be addressed.
Received: 17 January 2018 / Revised: 12 February 2018 / Accepted: 22 February 2018 / Published: 28 February 2018
(This article belongs to the Section Energy Fundamentals and Conversion)
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Abstract

External exhaust gas recirculation (EGR) stratification in diesel engines contributes to reduction of toxic emissions. Weak EGR stratification lies in that strong turbulence and mixing between EGR and intake air by current introduction strategies of EGR. For understanding of ideal EGR stratification combustion, EGR was assigned radically at −30 °CA after top dead center (ATDC) to organize strong EGR stratification using computational fluid dynamics (CFD). The effects of assigned EGR stratification on diesel performance and emissions are discussed in this paper. Although nitric oxides (NOx) and soot emissions are both reduced by means of EGR stratification compared to uniform EGR, the trade-off between NOx and soot still exists under the condition of arranged EGR stratification with different fuel injection strategies. A deterioration of soot emissions was observed when the interval between main and post fuel injection increased, while NO emissions increased first then reduced. The case with a 4 °CA interval between main and post fuel injection is suitable for acceptable NO and soot emissions. Starting the main fuel injection too early and too late is not acceptable, which results in high NO emissions and high soot emissions respectively. The start of the main fuel injection −10 °CA ATDC is suitable. View Full-Text
Keywords: injection timing; exhaust gas stratification; diesel combustion; emissions injection timing; exhaust gas stratification; diesel combustion; emissions
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Shen, Z.; Cui, W.; Ju, X.; Liu, Z.; Wu, S.; Yang, J. Numerical Investigation on Effects of Assigned EGR Stratification on a Heavy Duty Diesel Engine with Two-Stage Fuel Injection. Energies 2018, 11, 515.

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