Optimized Design of GDI Engine Combustion&nbsp;Chamber Based on Simulation and Calculation

LI Xuewei; LING Xinchen; CAO Bo

doi:10.3969/j.issn.1001-2222.2018.01.006

Vehicle Engine ›› 2018, Vol. 0 ›› Issue (1) : 32-38. DOI: 10.3969/j.issn.1001-2222.2018.01.006

Optimized Design of GDI Engine Combustion Chamber Based on Simulation and Calculation

LI Xuewei,LING Xinchen,CAO Bo

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Abstract

The in-cylinder flow and spray process of a GDI engine with a high compression ratio were simulated with AVL FIRE software and the influences of different combustion chamber structures on incylinder flow were researched. The effects of different designs on gas mixture formation were determined based on eight kinds of evaluation parameters such as tumble, swirl, turbulent kinetic energy, incylinder equivalence ratio fraction and et al. Finally, the design of combustion chamber was evaluated by introducing optimization rate and analyzing the calculated results. The evaluation results show that the optimization rate of design can reach 25.3% and 23.4% in high and low speed conditions respectively according to the optimized design and hence the incylinder mixture formation process improves.

Key words

in-cylinderdirect injection / gasoline engine / combustion chamber / optimized design / evaluation index

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LI Xuewei,LING Xinchen,CAO Bo. Optimized Design of GDI Engine Combustion Chamber Based on Simulation and Calculation[J]. Vehicle Engine. 2018, 0(1): 32-38 https://doi.org/10.3969/j.issn.1001-2222.2018.01.006