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http://dx.doi.org/10.5916/jkosme.2015.39.6.626

Prediction of Matching Performance of Two-Stage Turbo-charging System Design for Marine Diesel Engine  

Bae, Jin-woo (Korea Testing Laboratory)
Lee, Ji-woong (Korea Institute of Maritime & Fisheries Technology)
Jung, Kyun-sik (Ship Training Center, Korea Maritime and Ocean University)
Choi, Jae-sung (Division of Marine Engineering, Korea Maritime and Ocean University)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.39, no.6, 2015 , pp. 626-632 More about this Journal
Abstract
The International Maritime Organization (IMO) has adopted several regulations for the prevention of air pollution from ships. In addition, there is a requirement for shipping liners to reduce greenhouse gas emissions. Accordingly, we need to take measurements to ensure that the steps taken are both efficient and environmentally friendly. It has been determined that the application of the Miller cycle in diesel engines has the effect of both reducing the amount of NOx and improving thermal efficiency. However, this method requires a considerably larger charge air pressure. Therefore, we consider a two-stage turbo-charging system, which not only results in a high charging pressure, but also improves the part load performance with an exhaust-gas bypass system or the application of the Miller cycle. Because of complications associated with the two-stage turbo-charging system, it is complex and difficult to realize a design that optimizes matching between diesel engine and turbo-chargers. Accordingly, it is necessary to perform a quantitative analysis to determine the effects and optimal conditions of these different systems in the early stage of system design. In this paper, we develop a simulation program to model these systems, and we verify that the results of this program are reliable. Further, we discuss methods that can be employed to improve its efficiency.
Keywords
Air pollution prevention; Marine diesel engine; Two-stage turbo-charging; Exhaust gas bypass; Matching performance;
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