Hole Cross Section Shape Influence on Diesel Nozzle Flow

Progress in hole drilling technique is opening new perspectives in diesel nozzle design. In such a scenario, research on unconventional hole shapes looks worthwhile, in order to evaluate their influence on fuel flow features within the nozzle. In the present paper, investigations have been based on modeling. Moving from a standard hole configuration towards oval shaped holes, 3D-CFD campaigns have been devoted to highlight the hole layout influence on diesel nozzle flow. The investigations have been focused both on the fuel flow pattern at hole inlet and on the flow features at hole exit section; in such a modeling process, transient data concerning spatial distribution of velocity, turbulent kinetic energy and cavitation behavior at hole exit have been computed, highlighting the perturbations induced by the unconventional hole shape on the fuel flow; once the flow behavior has been explored, results have been resumed indicating how flow pattern properties are reflected at hole exit, quantitatively.