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Modification of a Diesel Oil Surrogate Model for 3D CFD Simulation of Conventional and HCCI Combustion
Technical Paper
2008-01-2410
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper describes an analysis of the Diesel Oil Surrogate (DOS) model used at Chalmers University (Sweden), including 70 species participating in 310 reactions, and subsequent improvements prompted by the model's systematic tendency to under-predict the combustion intensity in simulations of kinetically-driven combustion modes, e.g. Homogeneous Charged Compression Ignition (HCCI).
Key bases of the model are the properties of a model Diesel fuel with the molecular formula C14H28. In the vapor phase, a global reaction decomposes the starting fuel, C14H28, into its constituent components; n-heptane (C7H16) and toluene (C7H8). This global reaction was modified to yield a higher n-heptane:toluene ratio, due to the importance of preserving an n-heptane-like cetane number. Three different (composite) versions of this global decomposition reaction were investigated separately and compared:
- 13C14H28 + O2 => 4C7H16 + 2C7H8 +2H2O
- 22C14H28 => 3C7H16 + C7H8
- 33C14H28 + 3.5O2 => 5C7H16 + 0.5C7H8 + 3.5CO2
Reaction 1 is the original formulation and reactions 2 and 3 are novel alternatives. The effects of modifying the activation energies (E), collision frequency factors (A) and oxygen concentration exponents (AEO) of these reactions was examined when integrated into the 3D KIVA-3V CFD code, while leaving the elementary reactions unchanged. The results were compared with data obtained from measurements of a High Speed Direct Injected (HSDI) engine, operating in both conventional and HCCI combustion modes. Finally, the global reaction version and the rate constants giving the best agreement for the examined regimes were identified.
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Bergman, M. and Golovitchev, V., "Modification of a Diesel Oil Surrogate Model for 3D CFD Simulation of Conventional and HCCI Combustion," SAE Technical Paper 2008-01-2410, 2008, https://doi.org/10.4271/2008-01-2410.Also In
References
- Cathonnet, M. Advances and Challenges in the Chemical Kinetics of Combustion Proceedings of the European Combustion Meeting Orleans October 25-28 2003
- Guibet, J.C. Fuels and Engines Editions Technip Paris 1999
- Farrell, J.T. Cernavsky, N.P Dryer, F.L. et al Development of an Experimental Database and Kinetic Models for Surrogate Diesel Fuels SAE Paper 2007-01-0201 2007
- Gustavsson, J. Golovitchev, V.I. Spray Combustion Simulation Based on Detailed Chemistry Approach for Diesel Fuel Surrogate Model SAE Paper 2003-01-1848 2003
- Bergman, M. Golovitchev, V.I. Application of Transient Temperature vs. Equivalence Ratio Emission Maps to Engine Simulations SAE paper 2007-01-1086 2007
- Fredriksson, J. Bergman, M. Golovitchev, V.I. Denbratt, I. Modeling the Effect of Injection Schedule Change on Free Piston Engine Operation SAE Paper 2006-01-0449 2006
- Bergman, M. Fredriksson, J. Golovitchev, V.I. Performance and Emission Formation Evaluation of a Diesel-Fueled Free Piston Engine using CFD JSAE Paper 20065454 2006
- Gustavsson*, J. Golovitchev, V. I. Helmantel, A. 3-D Modelling of Conventional and HCCI Combustion Diesel Engines SAE paper 2004-01-2964 2004
- Amsden A.A. KIVA-3V A Block-structured KIVA Program for Engines with Vertical or Canted Valves July 1997
- Bergman, M. Golovitchev, V.I. Chemical Mechanisms for Modeling HCCI with Gasoline and Diesel Oil Surrogates, Proceedings of the VII Congress on Engine Combustion Processes 323 334 Munchen 15-16 March 2005 http://web.student.chalmers.se/#x0223C;miriam78/first.pdf
- Heywood, J., B. Internal Combustion Engine Fundamentals 638 McGraw-Hill Book Company 1988
- Stiesch, G. Modeling Engine Spray and Combustion Processes Springer-Verlag Berlin Heidelberg 2003
- Babajimopoulos, A. Assanis, D. Flowers, D. Aceves, S. Hessel, R. A Fully Coupled Computational Fluid Dynamics and Multi-Zone Model with Detailed Chemical Kinetics for the Simulation of Premixed Charge Compression Ignition Engines International Journal of Engine Research 6 5 497 512 16 2005
- Singh, S. Reitz, R.D. Musculus, M.P.B. Comparison of the Characteristic Time (CTC), Representative Interactive Flamelet (RIF), and Direct Integration with Detailed Chemistry Combustion Models against Optical Diagnostic Data for Multi-Mode Combustion in a Heavy-Duty DI Diesel Engine SAE Paper 2006-01-0055 2006
- Kong, S.C. Reitz, R.D. Application of Detailed Chemistry and CFD for Predicting Direct Injection HCCI Engine Combustion and Emissions Proceedings of the Combustion Institute 29 663 669 2002
- Aceves, S.M. Flowers, D.L. Espinoza-Loza, F. Babajimopoulos, A. Assanis, D.N. Analysis of Premixed Charge Compression Ignition Combustion with a Sequential Fluid Mechanics-Multizone Chemical Kinetics Model SAE Paper 2005-01-0115 2005