Study of the Portability of a 3D CFD Model for the Dynamics of Sprays Issuing from Multi-Hole GDI Injectors

Paper #:
  • 2011-01-1897

Published:
  • 2011-08-30
Citation:
Allocca, L., Costa, M., Montanaro, A., and Sorge, U., "Study of the Portability of a 3D CFD Model for the Dynamics of Sprays Issuing from Multi-Hole GDI Injectors," SAE Technical Paper 2011-01-1897, 2011, https://doi.org/10.4271/2011-01-1897.
Pages:
11
Abstract:
Three high pressure multi-hole GDI injectors, one manufactured by Continental, two manufactured by Bosch, are experimentally characterized under various injection strategies in terms of instantaneous mass flow rate and fuel dispersion. Spray visualization within an optically accessible pressure vessel allows the measurement of the single jet cone angle and penetration length.A portable numerical model for the issuing spray dynamics is developed within the AVL Fire code, exploiting a log-normal distribution for the initial droplets diameter, whose expected value and variance are properly defined as a function of the main physical parameters. Tuning of the entering constants is realized by means of an automatic optimization procedure.An example of application of the spray model within a 3D simulation of the in-cylinder process of a GDI engine is presented. Effects of splitting injection into two successive events are discussed.
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