Effects of Compression Ratio on the Performance and Emission Characteristics of Diesel Engine Fuelled with Ethanol Blend
The study of effects of compression ratio (CR) in a diesel engine fuelled with ethanol–diesel blends and diesel is important as they significantly affect its performance and emissions. The present paper focuses on the experimental investigation of the inf
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Abstract The study of effects of compression ratio (CR) in a diesel engine fuelled with ethanol–diesel blends and diesel is important as they significantly affect its performance and emissions. The present paper focuses on the experimental investigation of the influence of CR of the engine on the performance and emission characteristics of ethanol– diesel blended fuel and the results compared with diesel. Tests were carried out using three different compression ratios (CR 16.5:1, 14.3:1, and 12.6:1) at 40 and 60 % of maximum engine load. At lower CR the carbon monoxide (CO), carbon dioxide (CO2), hydro carbon emission (HC) increases and nitrogen oxides emissions (NOX) decreases. At higher CR the brake thermal efficiency (BTE) increases. It has been observed that the increase in BTE and brake specific fuel consumption (BSFC) was obtained with the increase of ethanol blend proportions with diesel. The emissions of NOX and CO2 decreases and the emission of CO and HC increases with increase of ethanol blend proportions with diesel. Keywords Compression ratio • Brake thermal efficiency • Emissions
M. Santhosh (*) P.S.N.A College of Engineering and Technology, Dindigul 624 622, India e-mail: [email protected] K. P. Padmanaban S.B.M College of Engineering and Technology, Dindigul, India e-mail: [email protected]
S. Sathiyamoorthy et al. (eds.), Emerging Trends in Science, Engineering and Technology, Lecture Notes in Mechanical Engineering, DOI: 10.1007/978-81-322-1007-8_6, © Springer India 2012
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M. Santhosh and K. P. Padmanaban
1 Introduction In recent studies on the reduction of exhaust emissions from diesel engines into the atmosphere have focused mainly on alternative fuels with reduced environmental impact. The investigations on diesel engines have expanded in the area of alternative fuels, among which ethanol–diesel blend represents a very promising fuel. Ethanol can be produced from biomass by fermentation of sugar, by converting the starch content of biomass feed stocks into alcohol (bio ethanol) or by hydration of ethylene which is obtained from petroleum and other sources. Ethanol usually replaces gasoline in petrol engines and bio diesel makes the same for diesel engines, but diesel fuel blended with low concentrations of ethanol can also run a diesel engine. Diesel engines have better engine performance, low fuel consumption, and greater power output compared to those of gasoline-fueled spark ignition engines. Many investigations are related to the influence of blending ethanol with mineral diesel fuel on engine performance and exhaust emissions, showing an increase in brake thermal efficiency (BTE) and in specific fuel consumption [4], a slight decrease in engine power and a more significant decrease in exhaust emissions compared to the use of diesel fuel. It is reported that the ethanol have been considered as alternative fuels for diesel engines [1–3]. Raheman and Ghadge [12] researched the performance of diesel engine using biodiesel and its blends with diesel at varying com
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