1Internal Combustion Engines – ME422 Yeditepe ÜniversitesiIC-Engine FuelsProf.Dr. Cem SoruşbayInternal Combustion EnginesIC Engine Fuels¾Introduction¾Classification of fuels¾Manufacture of engine fuels¾Fuel specifications in general¾Specifications of SI-engine and CI-engine fuels
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2IC Engine FuelsIn IC engines, the chemical energycontained in the fuel is converted into mechanical powerby burning (oxidizing) the fuel inside the combustion chamber of the engine.As a result of the chemical reactions which occur inside the cylinder, heat is released. The fuel-air mixture (the working fluid before combustion) must stay in the cylinder for a sufficient time so that the chemical reactions can be completed.Fuels suitable for fast chemical reaction have to be used in IC engines.Hydrocarbons in liquid formAlcohols (methanol, ethanol)LPG (propane and butane)Natural gas (methane)HydrogenClassification of Engine FuelsLiquid hydrocarbonsFuels are mainly mixtures of hydrocarbons, with bonds between carbon atomsand between hydrogen and carbon atoms.During combustion these bonds are broken and new bonds are formed with oxygen atoms, accompanied by the release of chemicalenergy. Principal products are carbon dioxide and water vapour.Fuels also contain small amounts of mnHCOHSNO222,,,