| 张际洲，颜伏伍，陈子逸，王宇.正丁醇/柴油发动机燃烧排放特性及喷油、燃烧室形状影响[J].内燃机工程,2021,42(2):23-30. |
| Combustion and Emissions Characteristics of N-Butanol/Diesel Engine and Impact of Injection Strategy and Combustion Chamber Geometry |
| DOI：10.13949/j.cnki.nrjgc.2021.02.004 |
| Key Words:n-butanol multiple injections combustion chamber geometry combustion emission computational fluid dynamics simulation diesel engine |
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| Abstract:Based on a certain type of direct injection diesel engine, a three-dimensional model of a complete single-cylinder combustion chamber with intake and exhaust ports was established. The three-dimensional computational fluid dynamics (CFD) analysis software CONVERGE was used to simulate the spray, combustion and emissions of the engine. The effect of n-butanol blending ratio on the combustion and emissions of the diesel engines was studied. The results showed that with the increase of the n-butanol blending ratio, the peak cylinder pressure, ignition delay and combustion rate increase, the soot and carbon monoxide emissions gradually reduce, and the nitrogen oxides emissions slightly increase. In order to further improve the combustion and reduce the pollutant emissions of the engine fueled with n-butanol/diesel blended fuel, the combined effects of fuel injection strategy and combustion chamber geometry were studied. The results show that for an engine fueled with the blended fuel, multiple injection and suitable combustion chamber geometry can effectively improve the mixture in the cylinder, increase the turbulent kinetic energy in the cylinder, and further reduce the emissions of soot. Compared with pure diesel fuel, the blended fuel enables multiple injection to further lower soot emissions and simplifies fuel injection strategy, but it weakens the effect of combustion chamber geometry on the soot emissions. |
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