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Effects of Single and Double Post Injections on Diesel PCCI Combustion
Technical Paper
2013-01-0010
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In this study, single and double post injections were applied to diesel premixed charge compression ignition (PCCI) combustion to overcome the drawbacks those are high level of hydrocarbons (HC) and carbon monoxide (CO) emissions in a single-cylinder direct-injection diesel engine. The operating conditions including engine speed and total injection quantity were 1200 rpm and 12 mg/cycle, which are the representative of low engine speed and low load. The main injection timing of diesel PCCI combustion was set to 28 crank angle degree before top dead center (CAD BTDC). This main injection timing showed 32% lower level of nitric oxides (NOx) level and 8 CAD longer ignition delay than those of conventional diesel combustion. However, the levels of HC and CO were 2.7 and 3 times higher than those of conventional diesel combustion due to over-lean mixture and wall wetting of fuel. The efficiency of PCCI combustion was also 13% lower than that of conventional combustion under single injection and no EGR conditions due to the advanced combustion phase. With fixing of the main injection timing, single and double post injections were applied with exhaust gas recirculation (EGR). The quantity of single post injection was varied from 10 % to 30 % of the total injected fuel. For double post injections, the quantity of each post injection was set to 10 % or 15 % of the total injected fuel with various post injection timings. The applying of single and double post injections resulted in a significant reduction in HC and CO compared with main injection only because the combustion by post injection helped to combust unburned species completely, and double post injection was more effective to reduce these unburned species due to shortened spray penetration distance by split of post injection. However, the level of NOx emissions was increased because the combustion by post injection occurred under high ambient pressure and temperature. For the reduction of increased NOx emissions, the post injection timing was required to be retarded more than 30 CAD after start of main injection (ASOI). Under various EGR rates, the application of single and double post injections was effective to improve the trade-off relationship between NOx and HC, CO emissions. Thus, it was possible that low NOx level with lowered level of HC and CO emissions was maintained compared to the combustion with main injection only.
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Park, Y. and Bae, C., "Effects of Single and Double Post Injections on Diesel PCCI Combustion," SAE Technical Paper 2013-01-0010, 2013, https://doi.org/10.4271/2013-01-0010.Also In
References
- Yao , M. , Zheng , Z. and Liu . H. Progress and recent trends in homogeneous charge compression ignition (HCCI) engines Progress in Energy and Combustion Science 35 5 398 447
- Lewander , M. , Ekholm , K. , Johansson , B. , Tunestål , P. et al. Investigation of the Combustion Characteristics with Focus on Partially Premixed Combustion in a Heavy Duty Engine SAE Int. J. Fuels Lubr. 1 1 1063 1074 2009 10.4271/2008-01-1658
- Onishi , S. , Jo , S. , Shoda , K. , Jo , P. et al. Active Thermo-Atmosphere Combustion (ATAC) - A New Combustion Process for Internal Combustion Engines SAE Technical Paper 790501 1979 10.4271/790501
- de Ojeda , W. , Zoldak , P. , Espinosa , R. , and Kumar , R. Development of a Fuel Injection Strategy for Partially Premixed Compression Ignition Combustion SAE Int. J. Engines 2 1 1473 1488 2009 10.4271/2009-01-1527
- Horibe , N. , Harada , S. and Shioji , M. Improvement of premixed charge compression ignition based combustion by two-stage injection International Journal of Engine Research 10 251 263 2009
- Keeler , B. Constraints on the Operation of a DI Diesel Engine in Partially-premixed Combustion Mode Ph.D. Thesis The University of Nottingham Nottingham, United Kingdom 144 2009
- Kuzuyama , H. , Machida , M. , Kawae , T. , Tanaka , T. et al. High Efficiency and Clean Diesel Combustion Concept using Double Premixed Combustion: D-SPIA SAE Technical Paper 2012-01-0906 2012 10.4271/2012-01-0906
- Eiglmeier , C. , Bauder , R. , Frohlich , A. , Gabel , K. , Helbig , J. , Marckwardt , H. and Zulch , S. The New 3.0 Liter V6 TDI Engine with Duel-Stage Turbocharger in the Audi A6 and A7 20 th Aachen Colloquium Automobile and Engine Technology, Proceeding 911 941 2010
- Lequien , G. , Andersson , O. , Johansson , B. , Wellander , R. , Rosell , J. , Richter , M. and Alden , M. Liquid Spray Penetration Length during Late Post Injection in an Optical Light-Duty Diesel Engine The Eighth International Conference on Modeling and Diagnostics for Advanced Engine Systems (COMODIA 2012) July 2012
- Nandha , K. and Abraham , J. Dependence of Fuel-Air Mixing Characteristics on Injection Timing in an Early-Injection Diesel Engine SAE Technical Paper 2002-01-0944 2002 10.4271/2002-01-0944
- Wagner , R. , Cho , K. , Han , M. and Sluder , C. High Efficiency Clean Combustion in Light-Duty Multi-Cylinder Diesel Engine U.S. Department of Energy Efficiency and Renewable Energy Annual Progress report 2008
- Hotta , Y. , Inayoshi , M. , Nakakita , K. , Fujiwara , K. et al. Achieving Lower Exhaust Emissions and Better Performance in an HSDI Diesel Engine with Multiple Injection SAE Technical Paper 2005-01-0928 2005 10.4271/2005-01-0928
- Desantes , J. , Arrègle , J. , López , J. , and García , A. A Comprehensive Study of Diesel Combustion and Emissions with Post-injection SAE Technical Paper 2007-01-0915 2007 10.4271/2007-01-0915
- Hardy , W. and Reitz , R. An Experimental Investigation of Partially Premixed Combustion Strategies Using Multiple Injections in a Heavy-Duty Diesel Engine SAE Technical Paper 2006-01-0917 2006 10.4271/2006-01-0917
- Heywood , J. B. Internal Combustion Engine Fundamentals Mcgraw-Hill New York 1988
- Chen , S. Simultaneous Reduction of NOx and Particulate Emissions by Using Multiple Injections in a Small Diesel Engine SAE Technical Paper 2000-01-3084 2000 10.4271/2000-01-3084
- Kook , S. and Bae , C. Combustion Control Using Two-Stage Diesel Fuel Injection in a Single-Cylinder PCCI Engine SAE Technical Paper 2004-01-0938 2004 10.4271/2004-01-0938
- Lee , J. , Jeon , J. , Park , J. , and Bae , C. Effect of Multiple Injection Strategies on Emission and Combustion Characteristics in a Single Cylinder Direct-Injection Optical Engine SAE Technical Paper 2009-01-1354 2009 10.4271/2009-01-1354
- Ladommatos , N. , Abdelhalim , S. , Zhao , H. , and Hu , Z. The Dilution, Chemical, and Thermal Effects of Exhaust Gas Recirculation on Diesel Engine Emissions - Part 1: Effect of Reducing Inlet Charge Oxygen SAE Technical Paper 961165 1996 10.4271/961165
- Yao , M. , Zhang , Q. , Liu , H. , Zheng , Z. , Zhang , P. , Lin , Z. , Lin , T. and Shen , J. Diesel Engine Combustion Control: Medium or Heavy EGR? SAE Technical Paper 2010-01-1125 2010 10.4271/2010-01-1125
- Kouremenos , D. , Hountalas , D. , and Binder , K. The Effect of EGR on the Performance and Pollutant Emissions of Heavy Duty Diesel Engines Using Constant and Variable AFR SAE Technical Paper 2001-01-0198 2001 10.4271/2001-01-0198
- Hardy , W. and Reitz , R. A Study of the Effects of High EGR, High Equivalence Ratio, and Mixing Time on Emissions Levels in a Heavy-Duty Diesel Engine for PCCI Combustion SAE Technical Paper 2006-01-0026 2006 10.4271/2006-01-0026