Using one-dimensional modelling codes to analyse the influence of diesel nozzle geometry on injection rate characteristics

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Abstract
A combined experimental and computational investigation was performed in order to evaluate the influence of nozzle geometry on fuel injection rate and the injector dynamic of a Common-Rail fuel injection system for DI Diesel engines. The method for modelling the most critical parts of the injector have been explained in previous publications and the results confirm that the model is capable of predicting injector hydrodynamic behaviour. A series of parametric studies were performed to evaluate the influence of the nozzle seat type (VCO and microSAC) and the nozzle orifice geometry (cylindrical and conical). Experimental results of the fuel injection rate were included to validate the models. Furthermore, two commercial one-dimensional modelling codes have been used to carry out the study, obtaining excellent results using both codes.