Experimental and Numerical Study of Swirling ... - Solid Mechanics

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Experimental and Numerical Study of Swirling Flow in Scavenging Process for 2-Stroke Marine Diesel Engines When theoretical results are presented, no one seems to believe in them, except the one who did the analysis. When experimental results are presented, everyone seems to believe in them, except the one who did the experiments. From webpage of Professor Atle Jensen Mechanics Division Department of Mathematics University of Oslo
Experimental and Numerical Study of Swirling Flow in Scavenging Process for 2-Stroke Marine Diesel Engines Chapter 1 Introduction In this chapter a background of the motivation for the current study is given. Working principle of two-stroke marine diesel engines is described. A description of different types of the scavenging process is given and significance of scavenging process and the need for more efficient uniflow scavenging process is discussed. The chapter introduces the scope of the problem studied in this project and gives a layout of the current thesis. After its invention by Sir Dugald Clerk at the end of 19 th century (Blair, 1990), the two stroke cycle engine has evolved in different type/ designs. Today their applications vary from Lawn movers to large container ship propulsion. The most successful of all the two stroke cycle engines are the marine diesel propulsion units with their thermal efficiency being more than 50% (Blair, 1990). Low Speed Marine diesel engines mostly use very low grade diesel fuel. The combustion of such fuels and their large consumption result in production of large amount of environmental pollutants like CO2, NOx, Sulphur Oxides, Soot and different other particulate matters etc. With the increase in global trade, the marine transportation/ traffic has also increased. Considering a potential threat to air and marine environment, different governments and international legislative bodies acted and an international agreement on emission regulations was obtained in 1997 (Dam, 2007). Today, International Marine Organization (IMO) which is a United Nations Agency with 169 member states, develops and maintains the comprehensive regulatory framework for emission control from shipping industry as one of its mandates (Wikipedia, 2010). The IMO regulation ‘Annex IV of Marpol 73/78-Regarding the prevention of air pollution from ships’, ratified in 2005, has made the marine engine producers to develop more fuel efficient and environmentally benign technologies (Dam, 2007). The current study is also one of the many research projects by MAN Diesel A/S with goal of developing future marine diesel engines. Before discussing the scope of this study a short description and working cycle of large two stroke marine diesel engine is given. 1.1 Large Two-Stroke Marine Diesel Engine A schematic picture of large two stroke marine diesel engine is given in figure 1.1 which shows cold air entering from the scavenging box to cylinder via scavenging ports and removing the exhaust gases through cylinder 1 Introduction
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DTU Mechanical Engineering Section
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Experimental and Numerical Study of Swirling ... - Solid Mechanics

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