Compression ratio effects on an ethanol/gasoline fuelled engine performance

Abstract This work investigates the influence of compression ratio on the performance of a spark ignition engine fuelled by a blend of 78% gasoline-22% ethanol (E22) or hydrous ethanol (E100). A 1.0-L, eight-valve, four-cylinder, production engine was tested in a dynamometer bench varying the speed in the range from 1500 to 6500 rev/min. Three compression ratios were investigated: 10:1, 11:1 and 12:1. The performance parameters evaluated were torque, brake mean effective pressure (BMEP), power, specific fuel consumption (SFC), thermal efficiency, exhaust gas temperature and volumetric efficiency. The results showed that higher compression ratios improved engine performance for both fuels throughout all the speed range investigated, with major effects being observed when hydrous ethanol was used.

[1]  S. J. Kline,et al.  Describing Uncertainties in Single-Sample Experiments , 1953 .

[2]  K. Owen,et al.  Automotive Fuels Reference Book , 1995 .

[3]  Adnan Sözen,et al.  Comparative study of mathematical and experimental analysis of spark ignition engine performance used ethanol–gasoline blend fuel , 2007 .

[4]  Heinz Heisler,et al.  Advanced Engine Technology , 1985 .

[5]  Combustion and Emissions of Ethanol Fuel (E100) in a Small SI Engine , 2003 .

[6]  Jeffrey Naber,et al.  Combustion characterization in an internal combustion engine with ethanol - Gasoline blended fuels varying compression ratios and ignition timing , 2009 .

[7]  John B. Heywood,et al.  Internal combustion engine fundamentals , 1988 .

[8]  Edward Werninghaus,et al.  Development of 1.6L Flex Fuel Engine for Brazilian Market , 2005 .

[9]  José Ricardo Sodré,et al.  Hydrous ethanol vs. gasoline-ethanol blend: Engine performance and emissions , 2010 .

[10]  M. Çelik,et al.  Experimental determination of suitable ethanol–gasoline blend rate at high compression ratio for gasoline engine , 2008 .

[11]  Can Çinar,et al.  Effect of ethanol-gasoline blends on engine performance and exhaust emissions in different compression ratios , 2006 .

[12]  M. A. Ceviz,et al.  Effects of ethanol–unleaded gasoline blends on cyclic variability and emissions in an SI engine , 2005 .

[13]  Bin Wang,et al.  Effect of Compression Ratio on Cycle-by-Cycle Variations in a Natural Gas Direct Injection Engine , 2009 .

[14]  Eric Warren Curtis,et al.  Engine cycle simulation of ethanol and gasoline blends , 2003 .