This paper presents results of a coupling of the Volume-of-Fluid Large-Eddy simulation (VOF-LES) of the jet primary breakup with a Lagrangian stochastic spray simulation of a GDi multi-hole injector. The objective is to assess the potential of replacing the phenomenological models of jet primary atomization with the stochastic parcel size - velocity data extracted from the VOF-LES analysis. The paper describes the methodology and assesses the predictive capability achieved, through comparison of the Lagrangian far-field spray simulation results with the complete experimental spray characterization data under the atmospheric ambient conditions.The injector sac-nozzle flow and jet primary breakup simulation is performed with the Open-FOAM code. The simulation of the spray development processes - of propagation, evaporation and secondary atomization - is performed with the AVL-FIRE commercial CFD code adopting the standard Lagrangian discrete droplet method.The comparison demonstrates good quantitative agreement for prediction of all significant far-field spray plume parameters, notably the trajectory, spread angle, tip penetration, foot-print pattern and the droplet-size probability distribution function.
Coupled LES Jet Primary Breakup - Lagrangian Spray Simulation of a GDi Multi-Hole Fuel Injector
Sae Int. J. Fuels Lubr
Sae International Journal of Fuels and Lubricants
SAE 2015 World Congress & Exhibition ; 2015
Sae International Journal of Fuels and Lubricants ; 8 , 1 ; 179-189
2015-04-14
11 pages
Aufsatz (Konferenz)
Englisch
Coupled LES jet primary breakup - Lagrange spray simulation of a GDI multi-hole fuel injector
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