The use of biodiesel in conventional diesel engines results in increasedNOxemissions; this presents a barrier to the widespread use of biodiesel. The origins of this phenomenon were investigated using the chemical kinetics simulation tool: CHEMKIN-2 and the CFD KIVA3V code, which was modified to account for the physical properties of biodiesel and to incorporate semidetailed mechanisms for its combustion and the formation of emissions. Parametric ϕ-T maps and 3D engine simulations were used to assess the impact of using oxygen-containing fuels on the rate of NO formation. It was found that using oxygen-containing fuels allows more O2molecules to present in the engine cylinder during the combustion of biodiesel, and this may be the cause of the observed increase in NO emissions.
Finalment per a poder portar a terme aquests estudis i complir amb l'objectiu principal es fa ús d'un programari comercial cineticoquímic, Chemkin, en la seua versió Professional, que serveix tant d'eina desenvolupadora com de referència.A mis padres (Pepe y Empar), mi hermano (Carles) y mi mujer (Maria José) que han sido piezas fundamentales para completar esta etapa de mi vida. Pero sobre todo a mi hijo Pau que me ha enseñado muchísimo. AGRADECIMIENTOSA mis padres, Josep y Empar, porque han estado siempre presentes en todas las dificultades que enfrenté. Os debo mucho porque sois ejemplos de carácter, esfuerzo, cariño y dedicación. A mi hermano Carles que es una gran persona, que merece mucho la pena, y que es un compañero de infatigables aventuras.A mi mujer Maria José que ha estado a mi lado todo este tiempo, ayudándome durante el doctorado, con su dedicación, cariño y paciencia. Gracias por tu optimismo. Mi hijo Pau que ha sido una fuente de inspiración, de diversión y una bocanada de aire fresco.
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