A comprehensive Two-Fluid Model for Cavitation and Primary Atomization Modelling of liquid jets - Application to a large marine Diesel injector

9th International Symposium on Cavitation

Habchi, Chawki^1,2 ; Bohbot, Julien^1,2 ; Schmid, Andreas^3 ; Herrmann, Kai^4

IFP Energies Nouvelles, 1 et 4 avenue de Bois-Préau, Rueil-Malmaison

92852, France^1

Institut Carnot, IFPEN Transports Energie, France^2

Winterthur Gas and Diesel Ltd., Winterthur

CH-8401, Switzerland^3

Paul Scherrer Institute, Villigen PSI, CH-5232, Switzerland^4

关键词: Cavitating flow;    Liquid cores;    Marine diesel;    Numerical results;    Pocket shapes;    Primary atomizations;    Strong correlation;    Two fluid model;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/656/1/012084/pdf
DOI  :  10.1088/1742-6596/656/1/012084

来源: IOP

【 摘 要 】

In this paper, a comprehensive two-fluid model is suggested in order to compute the in-nozzle cavitating flow and the primary atomization of liquid jets, simultaneously. This model has been applied to the computation of a typical large marine Diesel injector. The numerical results have shown a strong correlation between the in-nozzle cavitating flow and the ensuing spray orientation and atomization. Indeed, the results have confirmed the existence of an off-axis liquid core. This asymmetry is likely to be at the origin of the spray deviation observed experimentally. In addition, the primary atomization begins very close to the orifice exit as in the experiments, and the smallest droplets are generated due to cavitation pocket shape oscillations located at the same side, inside the orifice.