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Numerical Investigation of the Effect of Spray Cone Angle on Mixture Formation and CO/Soot Emissions in an Early Injection HCCI Diesel Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 14, 2015 by SAE International in United States
Annotation ability available
Impingement of injected fuel spray against the cylinder liner (wall wetting) is one of the main obstacles that must be overcome in order for early injection Homogeneous Charge Compression Ignition (EI HCCI) combustion. In the strategies to reduce or prevent wall wetting explored in the past, limiting the spray cone angle was proved to be a useful approach.
This paper is presented to study the effect of the spray cone angle on the mixture formation, particularly the region near the cylinder wall (wall wetting region), and CO/Soot emissions of an EI HCCI diesel engine. Three-dimensional modeling was performed in AVL FIRE code. The calculation grid was divided into three regions which were defined as the combustion chamber region, the wall wetting region, and the central regions. The history of the CO/soot mass of each region and the equivalent ratio/temperature (φ-T map) of wall wetting region were analyzed. In addition, a parameter named Mixture Homogeneous Index (MHI) was introduced to evaluate the quality of fuel/air mixture.
Conclusions drawn from the simulation suggested that wall wetting region contributed most to the total engine-out soot /CO emissions. The spray cone angle directly controlled the mixture formation and soot /CO emissions of the wall wetting region. Using narrow spray cone angle injector could reduce the wall film formed in the early injection period, further enhancing the homogeneity of the mixture in wall wetting region. This promoted the oxidation of soot and CO and improved the emission level of EI-HCCI diesel engine.
- Hanzhengnan Yu - State Key Lab. of Engines
- Yong Guo - China Automobile Technology and Research
- Donghai Li - Weichai Power Co., Ltd.; Shanghai R&D Center
- Xingyu Liang - State Key Lab. of Engines
- Ge-Qun Shu - State Key Lab. of Engines
- Yuesen Wang - State Key Lab. of Engines
- Xiangxiang Wang - State Key Lab. of Engines
- Lihui Dong - State Key Lab. of Engines
CitationYu, H., Guo, Y., Li, D., Liang, X. et al., "Numerical Investigation of the Effect of Spray Cone Angle on Mixture Formation and CO/Soot Emissions in an Early Injection HCCI Diesel Engine," SAE Technical Paper 2015-01-1070, 2015, https://doi.org/10.4271/2015-01-1070.
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