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Modeling the Effects of High EGR Rates in Conjunction with Optimum Multiple Injection Techniques in a Heavy Duty DI Diesel Engine
Technical Paper
2014-01-1124
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Exhaust Gas Recirculation (EGR) is an effective pre-treatment technique, which has been widely used to decrease the amount of the oxides of nitrogen (NOx) emission from diesel engines. However, the use of high EGR rates leads to the reduction in oxygen availability in the burning regions of the combustion chamber which impairs the soot oxidation process. Consequently, higher soot generated by EGR leads to long-term usage problems inside the engines such as higher carbon deposits, lubricating oil degradation and enhanced engine wear. In this study, CFD modeling has been carried out to analyze the effects of high EGR rates in conjunction with optimum multiple injection strategies. A heavy-duty DI Diesel engine has been modeled to study the engine performance and emissions with various EGR rates (from 0% to 40%). The selected operating points have been achieved with the same injection profile including a main and post injection for all considered cases. The results showed the effectiveness of multiple injections at controlling soot emission under high EGR conditions. By using multiple injections the soot formation is accrued in the multiple regions in the combustion chamber and thus has more area for oxidation. The fuel that is pulsed into the combustion chamber after main injection ignites rapidly and thus will not contribute significantly to soot formation in high temperature rich regions. Even though the EGR reduces some of the intake oxygen content, the heat added to the intake air enhances the soot oxidation to some extent which leads to reduction of soot emission. It was found that, the optimum separation for simultaneous reduction of NOx with low soot emissions under high EGR rates can be obtained by using 25 CA dwell delay between the injection pulses.
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Mobasheri, R. and Khabbaz, S., "Modeling the Effects of High EGR Rates in Conjunction with Optimum Multiple Injection Techniques in a Heavy Duty DI Diesel Engine," SAE Technical Paper 2014-01-1124, 2014, https://doi.org/10.4271/2014-01-1124.Also In
References
- Rakowski , S. , Eckert , P. and Witt , A. , Engine Combustion Combustion Engines Development Springer Berlin Heidelberg 119 168 2012
- Flaig , U. , Polach , W. , and Ziegler , G. , Common Rail System (CR-System) for Passenger Car DI Diesel Engines; Experiences with Applications for Series Production Projects SAE Technical Paper 1999-01-0191 1999 10.4271/1999-01-0191
- Ramos , J. I , Internal Combustion Engine Modeling Hemisphere Publishing Corporation New York 1989
- Williams , F.A. Combustion Theory The Benjamin/Cummings Publishing Company 1985
- Hentschel , W. and Richter , J. , Time-Resolved Analysis of Soot Formation and Oxidation in a Direct-Injection Diesel Engine for Different EGR-Rates by an Extinction Method SAE Technical Paper 952517 1995 10.4271/952517
- Ladommatos , N. , Abdelhalim , S. , Zhao , H. , and Hu. , Z. Effects of EGR on Heat Release in Diesel Combustion SAE Technical Paper 980184 1998 10.4271/980184
- Dürnholz , M. , Eifler , G. , and Endres , H. , Exhaust-Gas Recirculation - A Measure to Reduce Exhaust Emissions of DI Diesel Engines SAE Technical Paper 920725 1992 10.4271/920725
- Ladommatos , N. , Balian , R. , Horrocks , R. , and Cooper , L. , The Effect of Exhaust Gas Recirculation on Combustion and NOx Emissions in a High-Speed Direct-injection Diesel Engine SAE Technical Paper 960840 1996 10.4271/960840
- Arcoumanis , C. , Nagwaney , A. , Hentschel , W. , and Ropke , S. , Effect of EGR on Spray Development, Combustion and Emissions in a 1.9L Direct-Injection Diesel Engine SAE Technical Paper 952356 1995 10.4271/952356
- Mattarelli , E. , Bianchi , G. , and Ivaldi , D. , Experimental and Numerical Investigation on the EGR System of a New Automotive Diesel Engine SAE Technical Paper 2000-01-0224 2000 10.4271/2000-01-0224
- Mobasheri , R. , Peng , Z. and Mirsalim , S. M , 2012 Analysis the Effect of Advanced Injection Strategies on Engine Performance and Pollutant Emissions in a Heavy Duty DI-Diesel Engine by CFD Modeling International Journal of Heat and Fluid Flow 33 1 59 69
- Mobasheri , R. and Peng , Z. , Investigation of Pilot and Multiple Injection Parameters on Mixture Formation and Combustion Characteristics in a Heavy Duty DI-Diesel Engine SAE Technical Paper 2012-01-0142 2012 10.4271/2012-01-0142
- Mobasheri , R. , Peng , Z. , and Mirsalim , S. , CFD Evaluation of Effects of Split Injection on Combustion and Emissions in a DI Diesel Engine SAE Technical Paper 2011-01-0822 2011 10.4271/2011-01-0822
- Mobasheri , R. and Peng , Z. , 2013 CFD Investigation into Diesel Fuel Injection Schemes with Aid of Homogeneity Factor Computers and Fluids 77 12 23
- Mobasheri , R. and Peng , Z. , The Development and Application of Homogeneity Factor on DI Diesel Engine Combustion and Emissions SAE Technical Paper 2013-01-0880 2013 10.4271/2013-01-0880
- Mendez , S. and Thirouard , B. , Using Multiple Injection Strategies in Diesel Combustion: Potential to Improve Emissions, Noise and Fuel Economy Trade-Off in Low CR Engines SAE Int. J. Fuels Lubr. 1 1 662 674 2008 10.4271/2008-01-1329
- Tow , T. , Pierpont , D. , and Reitz , R. , Reducing Particulate and NOx Emissions by Using Multiple Injections in a Heavy Duty D.I. Diesel Engine SAE Technical Paper 940897 1994 10.4271/940897
- Han , Z. , Uludogan , A. , Hampson , G. , and Reitz , R. , Mechanism of Soot and NOx Emission Reduction Using Multiple-injection in a Diesel Engine SAE Technical Paper 960633 1996 10.4271/960633
- Mikulic , L , Kühn , M. , Schommers , J. , and Willig , E. , Exhaust-Emission Optimization of DI-Diesel Passenger Car Engine with High-Pressure Fuel Injection and EGR SAE Technical Paper 931035 1993 10.4271/931035
- Uchida , N. , Shimokawa , K. , Kudo , Y. , and Shimoda , M. , Combustion Optimization by Means of Common Rail Injection System for Heavy-Duty Diesel Engines SAE Technical Paper 982679 1998 10.4271/982679
- Tatschl , R. , 3D-CFD Simulation of IC-Engine Flow, Mixture Formation and Combustion with AVL FIRE Combustion Engines Development Springer Berlin Heidelberg 601 630 2012
- ICE Physics & Chemistry AVL FIRE User Manual v.2009. 1 2009
- Reitz , R. D. Modeling Atomization Processes in High-Pressure Vaporizing Sprays Atomization and Spray Technology 3 309 337 1987
- Corcione , F. E , Allocca , L. , Pelloni , P. , Bianchi , G. M , and Luppino , F. , Modeling atomization and drop breakup of high-pressure Diesel Sprays ASME Journal of Engineering for Gas Turbine and Power 123 2 419 427 2001
- Naber , J. and Reitz , R. , Modeling Engine Spray/Wall Impingement SAE Technical Paper 880107 1988 10.4271/880107
- Dukowicz , J.K. Quasi-steady droplet change in the presence of convection, informal report Los Alamos Scientific Laboratory LA7997-MS 1979
- Hélie , J. & Trouvé , A. A modified coherent flame model to describe turbulent flame propagation in mixtures with variable composition Proc. Combust. Inst. 28 193 201 2000
- Colin , O. , Benkenida , A. , The 3-Zones Extended Coherent Flame Model (ECFM3Z) for Computing Premixed / Diffusion Combustion Oil & Gas Science and Technology - Rev. IFP 59 6 593 609 2004
- Subramanian , G. , Vervisch , L. , and Ravet , F. , New Developments in Turbulent Combustion Modeling for Engine Design: ECFM-CLEH Combustion Submodel SAE Technical Paper 2007-01-0154 2007 10.4271/2007-01-0154
- Shi , X. , Li , G. , and Zhou , L. , DI Diesel Engine Combustion Modeling Based on ECFM-3Z Model SAE Technical Paper 2007-01-4138 2007 10.4271/2007-01-4138
- Wiedenhoefer , J.F. and Reitz , R.D. Modelling the Effect of EGR and Multiple Injection Schemes on I.C. Engine Component Temperatures Numerical Heat Transfer, Part A: Applications 37 7 673 694 2000
- Dec , J. , A Conceptual Model of DI Diesel Combustion Based on Laser-Sheet Imaging* SAE Technical Paper 970873 1997 10.4271/970873