Collaborative Optimization of Operational Parameters and Combustion Chamber Geometry for Heavy-Duty Engine

QIN Xingnian; XIAO Gang; LI Yaopeng; JIA Ming

Vehicle Engine ›› 2023, Vol. 0 ›› Issue (2) : 18-24.

QIN Xingnian¹，XIAO Gang¹，LI Yaopeng²，JIA Ming²

Author information +

History +

Abstract

The collaborative optimization of operational parameters and combustion chamber geometry was conducted on a heavyduty diesel engine by coupling the threedimensional computational fluid dynamics software and the genetic algorithm. Through the optimization, the fuel consumption improved effectively without deteriorating NO_x emission under different operating conditions. According to the analysis of all the optimization cases, the operational parameters such as main injection timing and injection pressure had the most significant effects on diesel engine performance, and the geometrical parameters related to the piston bowl and step structure were also the primary factors. There were strong correlation between injection parameters and geometrical parameters, and the achievement of satisfied diesel engine performance depended on their close collaboration. The optimized combustion chamber geometry was helpful for fuel and air mixing, which produced higher combustion efficiency. Compared with the reference case, the optimized case adopted the later injection timing to delay the combustion phase and a higher injection pressure to shorten combustion duration. The optimal combustion chamber geometry was not the same under different loads and hence the above optimized combustion chamber obtained at high loads showed unsatisfied improvements on fuel consumption and NO_x emission at low loads.

Key words

diesel engine / combustion chamber / operational parameter / optimization design

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

QIN Xingnian，XIAO Gang，LI Yaopeng，JIA Ming. Collaborative Optimization of Operational Parameters and Combustion Chamber Geometry for Heavy-Duty Engine[J]. Vehicle Engine. 2023, 0(2): 18-24