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Numerical Study on Multiple Injection Strategies in DISI Engines for Particulate Emission Control
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 16, 2012 by SAE International in United States
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In this work a numerical analysis of multiple-injection strategy in homogeneous operation in DISI engines is presented.
Moving toward Euro 6 emission standards, one of the main challenges for GDI engines is the reduction of particulate emission in terms of mass and particle number. In fact, in stratified operation, the droplets injected during compression stroke may cause a significant amount of soot production, due to locally non-premixed combustion. Besides, in medium and high load, the liner and piston spray impingement is another possible reason of production of soot emission. In order to meet the required performance and emission targets, focusing on the reduction of particulate emission, a multiple injection strategy can be considered as an option to control both the mixture stratification and the wall impingement.
In particular, in this work a multiple injection strategy during intake stroke in homogeneous condition is analyzed. The analysis makes use of advanced simulation tools, which allows to select particular strategies to be validated on engine bench. First of all, starting from a given injection strategy for a DISI engine, some possible methods for splitting injection are considered and their feasibility with a particular type of injector is validated by means of a 1D model of the hydraulic and the complete engine systems. Then the 1D models are integrated with 3D models of the spray and the engine implemented into the Lib-ICE code, a set of library and applications developed to simulate IC engines using the OpenFOAM® technology. The engine cycle simulation is performed with the new injection strategies. The advanced CFD computational tool used for the investigation can manage piston and valve motion, fuel injection, air/fuel mixing and wall film formation so that the mixture formation process is effectively evaluated by means of the simulation. The investigation performed allows to assess the basic advantages of a multiple injection strategy: the reduction of the wall film impingement and the better air/fuel ratio distribution at the end of compression, which lead to lower soot formation.
CitationBonandrini, G., Di Gioia, R., Papaleo, D., and Venturoli, L., "Numerical Study on Multiple Injection Strategies in DISI Engines for Particulate Emission Control," SAE Technical Paper 2012-01-0400, 2012, https://doi.org/10.4271/2012-01-0400.
- van Basshuysen, R. Gasoline Engine with Direct Injection: Processes, Systems, Development, Potential Vieweg +Teubner 2009
- Eastwood, P. Particulate Emissions from Vehicles Wiley-PEPublishing Series, John Wiley & Sons 2008
- Costa, M. Allocca, L. Montanaro, A. Sorge, U. Reduction of Fuel Consumption of a GDI Engine by Split Injections ILASS - Europe 2011 Estoril, Portugal September 2011
- OpenFOAM http://www.openfoam.org SGI 2011
- Lucchini, T. D'Errico, G. Brusiani, F. Bianchi, G. et al. “Multi-dimensional modeling of the air/fuel mixture formation process in a PFI engine for motorcycle applications,” SAE Technical Paper 2009-24-0015 2009 10.4271/2009-24-0015
- Lucchini, T. D'Errico, G. Fiocco, M. “Multi-Dimensional Modeling of Gas Exchange and Fuel-Air Mixing Processes in a Direct-Injection, Gas Fueled Engine,” SAE Technical Paper 2011-24-0036 2011 10.4271/2011-24-0036
- Montanaro, A. Allocca, L. Ettorre, D. Lucchini, T. et al. “Experimental Characterization of High-Pressure Impinging Sprays for CFD Modeling of GDI Engines,” SAE Int. J. Engines 4 1 747 763 2011 10.4271/2011-01-0685
- LMS Imagine.Lab AMESim Rev 10 User Manual LMS International
- GT-SUITE General and Advanced Simulation Applications Manual Gamma Technologies
- Huh, K. Y. Gosman, A. D. A Phenomenological Model of Diesel Spray Atomization Proceedings of the International Conference on Multiphase Flows Tsukuba, Japan 1991
- Nurick, W. H. Orifice Cavitation and its Effects on Spray Mixing J. Fluids Eng. 90 681 687 1976
- Patterson, M. A. Reitz, R. D. Modeling Spray Atomization with the Kelvin-Helmholtz/Rayleigh-Taylor Hybrid Model Atomization and Sprays 9 6 623 650 1999
- Hung, D. Harrington, D. Gandhi, A. Markle, L. et al. “Gasoline Fuel Injector Spray Measurement and Characterization - A New SAE J2715 Recommended Practice,” SAE Int. J. Fuels Lubr. 1 1 534 548 2009 10.4271/2008-01-1068
- Bai, C. Gosman, A. “Mathematical Modelling of Wall Films Formed by Impinging Sprays,” SAE Technical Paper 960626 1996 10.4271/960626
- Lucchini, T. D'Errico, G. Onorati, A. Bonandrini, G. et al. “Development of a CFD Approach for Fuel-Air Mixing, Combustion and Pollutant Formation Modeling in Gasoline, Direct-Injection Engines,” SAE Technical Paper 2012-01-0146 2012 10.4271/2012-01-0146
- Kim, S. Takada, Y. Wakisaka, T. Effects of Mixture Inhomogeneity and Gas Flow on Combustion in a Premixed-charge Compression Ignition Engine Journal of the JIME 42 04 2007