首页|Numerical study of effect of post injection coupled with EGR on combustion and emission performances of CRDI engine fueled with biodiesel-ethanol blends

Numerical study of effect of post injection coupled with EGR on combustion and emission performances of CRDI engine fueled with biodiesel-ethanol blends

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Energy shortage and environmental pollution are becoming more serious,biodiesel is regarded as the most promising alternative fuel for diesel engines due to its environ-mentally friendly and renewable characteristics.In this study,the biodiesel-ethanol blends were used in a diesel engine,and the purpose of the study was to simultaneously control the NOx and soot emissions of the diesel engine by adjusting the injection strategy and EGR rate.A turbocharged,six-cylinder,common rail direct injection(CRDI)engine model was established using GT-Power.The effects of the main-post injection strategy and post in-jection coupled with exhaust gas recirculation(EGR)on combustion and emission char-acteristics were investigated at a maximum torque speed and a medium load.The results show that when the main-post injection strategy is employed,the combustion duration of the main injection is shortened with an increase in the main-post injection interval(MPI).When the MPI increased to more than 18 ℃A,the heat release of post injection could be observed clearly from the curve of the heat release rate,NOx emissions decreased by 5.70％and 7.12％,respectively,and soot emissions decreased by 25.56％and 30.20％,respectively.Moreover,with the increasing post injection quantity,the combustion duration of the main injection shortened,and the peak heat release rate(PHRR)of the post injection increased.When the fuel quantity for the post injection increased from 2 to 6 mg,NOx emissions decreased from 2.33％to 9.80％,and soot emissions decreased from 16.10％to 34.97％.The effect of post injection quantity on emissions was more significant than that of the MPI.In addition,with increasing EGR rate,the ignition delay is prolonged,the peak cylinder pressure,PHRR,peak combustion temperature and NOx emissions decrease,whereas soot emissions increase gradually.Main-post injection can improve the NOx-soot trade-off,the optimal EGR rate is 22.86％under a post injection quantity of 4 mg and a MPI of 22℃A.

Post injectionExhaust gas recirculationCombustion characteristicsExhaust emissionsBiodiesel-ethanol blends

Limin Geng、Hongliang Xiao、Yuxuan Cui、Nan Gao、Qi Li、Hao Chen、Yuantao Xie

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Key Laboratory of Shaanxi Province for Development and Application of New Transportation Energy,Chang'an University,Xian 710064,China

School of Energy and Electrical Engineering,Chang'an University,Xian 710064,China

Geely Automobile Research Institute(Ningbo)Co.,Ltd.,Ningbo 311228,China

陕西省重点研发计划Key Laboratory of Shaanxi Province for Development and Application of New Transportation EnergyFundamental Research Funds for the Central Universities in Changan UniversityYouth Innovation Team of Shaanxi Universities(Energy Saving and New Energy Automobile)

2021GY-291CHD300102221508300102220105

2023

10.1016/j.jtte.2022.09.002

交通运输工程学报(英文版)

交通运输工程学报(英文版)

CSTPCDCSCD
ISSN：2095-7564
年,卷(期)：2023.10(6)
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