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Performance and Knock Limits of Ethanol-Gasoline Blends in Spark-Ignited Engines
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Abstract
Ethanol-gasoilne blends have been investigated as a spark-ignition engine fuel. The work was carried out on a Ricardo E6 variable compression engine in which all the significant operating parameters can be varied and accurately measured including onset of knock. Various blends were used (10 to 70% ethanol by volume) and the effects of mixture strength, ignition timing and speed on the highest useful compression ratio were accurately defined. Borderline road test data were evaluated using information on reference fuels and the required performance of the automatic spark advance mechanism was deduced. The results revealed that higher concentration of ethanol in the blend greatly enhances knock resistance. A blend of 50% gasoline and 50% ethanol produced the highest output in both the rich and lean mixture regions. The performance of the automatic spark advance mechanism was found to vary considerably with various blends and mixture strengths. The sensitivity of optimum power attainment to ignition timing and mixture strength was illustrated. Also the saving in mechanical octanes was put forward.
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Citation
Radwan, M., "Performance and Knock Limits of Ethanol-Gasoline Blends in Spark-Ignited Engines," SAE Technical Paper 850213, 1985, https://doi.org/10.4271/850213.Also In
References
- “The Report of the Alcohol Fuels Policy Review” U.S. Department of Energy 1979
- “The Effect of Alcohol Blends on the Performance of Air-Cooled Rotary Trochoidal Engine” Gutman M. SAE 840237
- “Testing of a 10% Ethanol-90% Gasoline Mixture for Automotive Fuel” Scheller W. M. presented at the UN Workshop on Fermentation Alcohol Vienna, Austria March 1979
- “Mixture Maldistribution and Aldehyde Emissions in an Alcohol-Fueled SI Engine” Subbarao K. Gopalakrishnan K. V. Ganesan V. Murthy B. S. SAE 830511
- “Preventing Phase Separation of Alcohol Petroleum Fuel Mixtures” Smith E. J. Jordan D. R. SAE 830385
- “The Effects of Lubricant Composition on SI Engine Wear with Alcohol Fuels” Marbach, H. W. Jr. Frame E. A. Owens E. C. Naegeli D. W. Wielgos B. D. SAE 831702
- “Lubrication of Alcohol-Fueled Engines” Reglitzky A. A. Halter H. J. Krumm H. 4th Int. Seminar on Developments in Fuels, Lubricants and Additives and Energy Conservation Cairo, Egypt March 7-10 1983