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BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică „Gheorghe Asachi“ din Iaşi, Tomul LVIII (LXII), Fasc. 4, 2012 Secţia CONSTRUCŢII DE MAŞINI MIXING RULES FOR PREDICTING THE IGNITION PROPERTIES OF AUTOMOTIVE DIESEL ENGINE FUELS BY ANCA ELENA ELIZA STERPU* and ANCA IULIANA DUMITRU Received: March 30, 2012 Accepted for publication: April 14, 2012 ”OVIDIUS” University, Constanţa, Department of Chemistry and Chemical Engineering Abstract. Biodiesel can be defined as fatty acid alkyl esters from vegetable oils or animal fats for using as fuel in diesel engines and heating systems due to its technical, environmental and strategic advantages. Because its physical properties and chemical composition are distinctly different from conventional diesel fuel, biodiesel can alter the fuel injection and ignition processes whether neat or in blends. Most research on computational combustion presents complex mathematical models where the fuel physical properties are important parameters. The aim of this study is to present the importance of the physical properties and their relation to the internal combustion engine and also proposing a method to determine the volumetric proportion of biodiesel which will have efficient combustion in compression engines. For this purpose, the basic properties (density, viscosity, flash point, heating value, calculated cetane index and three different points of the distillation curve: T10, T50 and T90) of several rapeseed (Canola) oil biodiesel–diesel fuel blends (B0, B5, B10, B15, B20, and B100) were measured according to the corresponding ASTM standards. In order to predict these properties, mixing rules are estimated as a function of the volume fraction of biodiesel in the blend. Key words: automotive diesel engine, ignition characteristics, biodiesel–diesel blends, calculated cetane index. * Corresponding author: e-mail: asterpu@univ-ovidius.ro
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VICTOR COTOROS şi EMIL BUDESCU, As
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