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Title: Studies on the enhancement of diesel engine combustion through the use of fuel additives and in-cylinder turbulence inducement techniques
Researcher: Venketesh Babu, R
Guide(s): Sendilvelan, S
Keywords: Bluff Bodies
Direct Injection Diesel Engines
Fuel Additives
In-Cylinder Turbulence
Internal Jets
Upload Date: 26-May-2010
University: Bharath University
Completed Date: October 2008
Abstract: Owing to direct injection (DI) diesel engines becoming acceptable choice as prime movers in many applications, it has become imperative to improve their fuel consumption and emission characteristics. For this purpose, several attempts are ongoing to improve the emission characteristics of DI diesel engines without having to sacrifice their fuel consumption advantage. In diesel engines, fuel is injected near compression top dead center and hence the requirements of fuel-air mixing are quite stringent. The fuel-air mixing process therefore remains at the core of the diesel engine combustion and emission problems. Beside better fuel-air mixing, the improvements in diesel engines are also possible through changes in fuel. In the present work, the changes in fuel and fuel-air mixing process are tested independently and together to improve diesel engine performance and emission characteristics. A simpler method of producing in-cylinder turbulence has been arrived at and investigated. The same has been combined with the best of the additives tested to attain a significant decrease in fuel consumption and exhaust smoke concentration. Six polymer based additives of varying properties are mixed in different proportions in diesel fuel and their experimental results compared. Beside, comparing the measured performance and the exhaust emissions (exhaust smoke and oxides of nitrogen) of various fuel-additive combinations, a detailed and systematic combustion analysis of the acquired cylinder pressure histories on these samples has been attempted for understanding the effect of the additives on the engine combustion characteristics. From iii this analysis, it is observed that the engine combustion has become smoother in presence of certain additives proportions used here. The maximum improvements in BSFC and exhaust smoke level are found to be 13 % and 37.5 % respectively in case of Additive 6 (at 2% by volume) fuel-additive combinations as compared to that of the base diesel fuel.
Pagination: xii, 114p.
Appears in Departments:Department of Engineering and Technology(Automobile Enginnering)

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