吉林大学学报(工学版) ›› 2016, Vol. 46 ›› Issue (4): 1109-1117.doi: 10.13229/j.cnki.jdxbgxb201604015

• Orginal Article • Previous Articles     Next Articles

Simulation of EGR on combustion and emission of gasoline direct-injection engine

YU Xiu-min, SHANG Zheng, ZHANG Yue-tao, DU Yao-dong   

  1. College of Automotive Engineering, Jilin University, Changchun 130022,China
  • Received:2015-11-17 Online:2016-07-20 Published:2016-07-20

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Abstract: In this paper, three-dimensional (3D) simulation was carried out for the process from intake stroke to exhaust valve opening of a Gasoline Direct-Injection (GDI) engine combined with Exhaust Gas Recirculation (EGR) system using Computational Fluid Dynamics (CFD) software. The effects of different EGR rates and excess air factor, λ, on combustion and emission performances were analyzed. The temperature field, flame surface density, NO concentration field, CO concentration field and soot concentration field were also investigated. Simulation results show that the EGR has little influence on the combustion but it can effectively reduce the emission when the EGR rate is 10%. In addition, while the cylinder pressure descends slightly, the emission can be obviously reduced when λ=1.1; while as λ=1.0, the engine has higher cylinder pressure and moderate emission.

Key words: power machinery and engineering, gasoline engine, gasoline direct-injection(GDI), exhaust gas recirculation(EGR), combustion, emission, simulation

CLC Number: 

  • UK41
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