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| Physicochemical Properties and Spray Combustion Characteristics of Hydrated Ethanol Diesel Emulsions |
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| Key Words:IC engine emulsified fuels physicochemical properties penetration cone angle combustion constant volume combustion vessel |
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| Abstract:Hydrated ethanol diesel emulsified fuels with different mass fractions of water containing ethanol were prepared, and the physicochemical properties of the emulsified fuels were analyzed. With an increases in the mass fraction of hydrated ethanol, the density and kinematic viscosity of an emulsion increase slightly, the surface tension drops a little, the distilling temperature decreases in the initial stage, the oxygen content increase gradually, and the cetane number and lower heating value decrease. High pressure spray and combustion of each emulsified fuel injected into a constant volume combustion vessel at both room temperature and high temperature with non evaporating spray and evaporating spray was studied. There are little differences among the fuels in the penetration length and cone angle in the non-evaporating spray, while the fuel with higher hydrated ethanol content exhibits a little shorter penetration length and a little narrower cone angle in the evaporating spray with no obvious tendency. Liquid penetration length in the evaporating spray increases significantly with the increase of the hydrated ethanol fraction. The intensity of natural luminosity in spray and combustion decreases with the increase of the hydrated ethanol content, suggesting less soot in the spray flames, while the ignition delay is little changed with the increase of the hydrated ethanol content under the condition of 21% oxygen and 900 K ambient temperature. |
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