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Energies 2017, 10(5), 684; doi:10.3390/en10050684

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

1
College of Mechatronic Engineering, North University of China, University Road No. 3, Taiyuan 030051, China
2
School of Mechanical and Power Engineering, North University of China, University Road No. 3, Taiyuan 030051, China
*
Author to whom correspondence should be addressed.
Academic Editor: Paul Stewart
Received: 28 December 2016 / Revised: 10 April 2017 / Accepted: 28 April 2017 / Published: 12 May 2017
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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 (NOx) 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. View Full-Text
Keywords: OPOC diesel engine; split injection; numerical simulation; combustion; emissions OPOC diesel engine; split injection; numerical simulation; combustion; emissions
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MDPI and ACS Style

Zhang, L.; Su, T.; Zhang, Y.; Ma, F.; Yin, J.; Feng, Y. Numerical Investigation of the Effects of Split Injection Strategies on Combustion and Emission in an Opposed-Piston, Opposed-Cylinder (OPOC) Two-Stroke Diesel Engine. Energies 2017, 10, 684.

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