Abstract
This paper presents research on the effects of the multiple injection strategies on the combustion and emission characteristics of a two-stroke heavy-duty marine engine at full load. The ANSYS FLUENT simulation software was used to conduct three-dimensional simulations of the combustion process and emission formations inside the engine cylinder in both single- and double-injection modes to analyze the in-cylinder pressure, temperature, and emission characteristics. The simulation results were then compared and showed good agreement with the measured values reported in the engine’s sea-trial technical reports. The simulation results showed reductions in the in-cylinder pressure and temperature peaks by 6.42% and 12.76%, while NO and soot emissions were reduced up to 24.16% and 68%, respectively, in the double-injection mode in comparison with the single-injection mode. However, the double-injection strategy increased the CO2 emission (7.58%) and ISFOC (23.55%) compared to the single-injection. These are negative effects of the double-injection strategy on the engine that the operators need to take into consideration. The results were in line with the literature reviews and would be good material for operators who want to reduce the engine exhaust gas emission in order to meet the stricter IMO emission regulations.
Highlights
Published: 19 October 2021In comparison with gasoline engines, direct injection (DI) diesel engines offer better reliability and higher thermal efficiency
Various gas fuels are currently being increasingly employed in marine engines to reduce engine exhaust gas emissions
This study focuses on the combustion process and emission characteristics inside the cylinder of a two-stroke marine main engine equipped on a university’s training ship
Summary
In comparison with gasoline engines, direct injection (DI) diesel engines offer better reliability and higher thermal efficiency. The method of adding water to the engine combustion chamber to reduce the peak temperature in the cylinder or modifying the engine working cycle (exhaust gas recirculation–EGR for example) are other effective ways to reduce emissions. They are being effectively used in the marine industry today. Focusing on the internal treatment approach, multiple injection strategies have been proven to be effective solutions to reduce soot or even NOx and soot simultaneously in both heavy-duty DI diesel engines [9,10,11,12,13] and light-duty DI diesel engines [14,15,16,17,18,19,20,21,22,23]. The simulation results were validated by comparing them with the engine’s sea-trial data
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