Numerical Investigation of the Effects of Split Injection Strategies on Combustion and Emission in an Opposed-Piston, Opposed-Cylinder (OPOC) Two-Stroke Diesel Engine

Lei Zhang, Tiexiong Su, Yangang Zhang, Fukang Ma, Jinguan Yin and Yaonan Feng
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Lei Zhang: College of Mechatronic Engineering, North University of China, University Road No. 3, Taiyuan 030051, China
Tiexiong Su: College of Mechatronic Engineering, North University of China, University Road No. 3, Taiyuan 030051, China
Yangang Zhang: School of Mechanical and Power Engineering, North University of China, University Road No. 3, Taiyuan 030051, China
Fukang Ma: School of Mechanical and Power Engineering, North University of China, University Road No. 3, Taiyuan 030051, China
Jinguan Yin: College of Mechatronic Engineering, North University of China, University Road No. 3, Taiyuan 030051, China
Yaonan Feng: College of Mechatronic Engineering, North University of China, University Road No. 3, Taiyuan 030051, China

Energies, 2017, vol. 10, issue 5, 1-17

Abstract: In opposed-piston, opposed-cylinder (OPOC) two-stroke diesel engines, the relative movement rules of opposed-pistons, combustion chamber components and injector position are different from those of conventional diesel engines. In this study, the combustion and emission characteristics of the OPOC which is equipped with a common-rail injection system are investigated by experimental and numerical simulation. Different split injection strategies involving different pilot injection/fuel mass ratios and injection intervals were compared with a single injection strategy. The numerical simulation was applied to calculate and analyze the effect of split injection strategies on the combustion and emission after validation with the same experimental result (single injection strategy). Results showed that using split injection had a significant beneficial effect on the combustion process, because of the acceleration effect that enhances the air-fuel mixture. Additionally, the temperature of the split injection strategies was higher than that of single strategy, leading to the nitrogen oxides (NO x ) increasing and soot decreasing. In addition, it has been found that the split injection condition with a smaller pilot injection/fuel mass ratio and a medium injection interval performed better than the single injection condition in terms of the thermo-atmosphere utilization and space utilization.

Keywords: OPOC diesel engine; split injection; numerical simulation; combustion; emissions (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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