Computational Fluid Dynamic (CFD) results of different diesel fuel injector nozzle configurations using commercially available CFD codes are presented in this paper. The emphasis of the study is on comparing various cavitation modeling approaches by means of single-phase and two-phases. Results are compared for various diesel injector nozzles and observed to substantiate some of the experimentally established facts such as nozzle efficiency improvements by using techniques like rounded orifice inlets and conical orifices. The effects of needle lift and injection pressure on forming cavatation are also investigated. These simulation results agree well with the experimental results. Parameters like discharge coefficient, Cd and initial amplitude factor, amp0 are used to characterize the internal flow through the nozzle orifices.

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