(c) IMechE 2013 ; A study of the injection process and spray behaviour was made for three different fuels. In particular, blends of rapeseed methyl ester and standard diesel fuel with 5% and 30% biodiesel were used for the current study, as well as pure rapeseed methyl ester. Hydraulic characterization of an eight-hole nozzle was carried out using these three fuels, in order to explore and analyse the influence of the fuel properties on the mass flow rate and the momentum flux at the nozzle exit. Additionally, spray visualization tests were performed in order to obtain information about the spray cone angle, which allows characterization of the air-fuel mixing process. Finally, a theoretical derivation was used to obtain further details of the microscopic characteristics of the spray and to compare the air-fuel mixing efficiencies for the different biodiesel blends. ; Vicerrectorado de Investigacion ; Desarrollo e Innovacion of the Universitat Politecnica de Valencia in the framework of the Project Estudio del Flujo en Toberas de Inyeccion Diesel Mediante Tecnicas LES 2837 ; Ministerio de Ciencia e Innovacion in the framework of the Project Estudio Teorico-experimental sobre la Influencia del Tipo de Combustible en Los Procesos de Atomizacion y Evaporacion del Chorro Diesel TRA2011-26293 ; Salvador, F.J.; Ruiz, S.; Salavert Fernández, JM.; De La Morena Borja, J. (2013). Consequences of using biodiesel on the injection and air-fuel mixing processes in diesel engines. Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering. 227(8):1130-1141. doi:10.1177/0954407012463667. ; Senia ; 1130 ; 1141 ; 227 ; 8