This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Numerical Simulation and Experimental Research on PPC Combustion and Emissions Characteristics of Diesel Engine
Technical Paper
2015-01-0401
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The partially premixed combustion (PPC) was realized in a 6-cylinder heavy turbocharged diesel engine with single injection and EGR strategies. Combined with chemical reaction mechanism, the combustion and emission processes of this mode was analyzed using level-set turbulent flame propagation model. Based on the experiments and simulations, the impacts of PPC on the heat release, NOx and PM emissions were further investigated. The results show that both the early-injection and late-injection strategies have a two-stage heat release and significantly higher premixed combustion proportion than the conventional combustion mode, however, mixing controlled combustion was also observed in the late-injection mode. The NOx and PM emission was reduced simultaneously in PPC. However, in the late-injection strategy, this was achieved at the expense of increased HC emission. The dynamic process of the core components in PPC was much different from those in conventional diesel spray combustion. Ketohydroperoxide was found to play an important role in the first stage ignition of PPC. The accumulated H2O2 in the first stage ignition leads to a high heat release peak in the second stage ignition. NOx was heavily observed in the downstream of the spray where OH was formed, while soot was formed in the fuel-rich mixture near the combustion chamber wall. The high HC emission in the late-injection PPC was primarily formed in the fuel-lean mixture where the second stage ignition was not achieved rapidly.
Authors
Topic
Citation
Liu, B., Cheng, X., Qiu, L., Dong, S. et al., "Numerical Simulation and Experimental Research on PPC Combustion and Emissions Characteristics of Diesel Engine," SAE Technical Paper 2015-01-0401, 2015, https://doi.org/10.4271/2015-01-0401.Also In
References
- Musculus , M.P.B. , Miles P.C. and Pickett L.M. Conceptual models for partially premixed low-temperature diesel combustion Progress in Energy and Combustion Science 2013 39 2-3 246 283
- Cheng , X. et al. Investigation of the combustion and emission characteristics of partially premixed compression ignition in a heavy-duty diesel engine Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 2014 228 7 784 798
- Laguitton , O. et al. The effect of compression ratio on exhaust emissions from a PCCI diesel engine Energy Conversion and Management 2007 48 11 2918 2924
- Han , M. , Assanis D.N. and Bohac S.V. Sources of Hydrocarbon Emissions from Low-Temperature Premixed Compression Ignition Combustion from a Common Rail Direct Injection Diesel Engine Combustion Science and Technology 2009 181 3 496 517
- Fang , T. et al. Effects of injection angles on combustion processes using multiple injection strategies in an HSDI diesel engine Fuel 2008 87 15-16 3232 3239
- Genzale , C.L. , Reitz R.D. and Musculus M.P.B. Effects of spray targeting on mixture development and emissions formation in late-injection low-temperature heavy-duty diesel combustion Proceedings of the Combustion Institute 2009 32 2 2767 2774
- Kim , M.Y. and Lee C.S. Effect of a narrow fuel spray angle and a dual injection configuration on the improvement of exhaust emissions in a HCCI diesel engine Fuel 2007 86 17-18 2871 2880
- Fang , T. et al. Influence of injection parameters on the transition from PCCI combustion to diffusion combustion in a small-bore HSDI diesel engine International Journal of Automotive Technology 2009 10 3 285 295
- Horiber , N. et al. Improvement of premixed charge compression ignition-based combustion by two-stage injection International Journal of Engine Research 2009 10 2 71 80
- Kokjohn , S.L. and Reitz R.D. Investigation of charge preparation strategies for controlled premixed charge compression ignition combustion using a variable pressure injection system International Journal of Engine Research 2010 11 4 257 282
- Murata , Y. et al. Emissions suppression mechanism of premixed diesel combustion with variable valve timing International Journal of Engine Research 2007 8 5 415 428
- Dec , J.E. Advanced compression-ignition engines-understanding the in-cylinder processes Proceedings of the Combustion Institute 2009 32 2 2727 2742
- Tan , Z. Development of a universal turbulent combustion model for premixed and direct injection spark/compression ignition engines 2004
- Liang , L. Multidimensional modeling of combustion and knock in spark-ignition engines with detailed chemical kinetics 2006 University of Wisconsin--Madison
- Liang , L. and Reitz R.D. Spark ignition engine combustion modeling using a level set method with detailed chemistry 2006 01 0243
- Norbert , P. 2000 Turbulent Combustion Cambridge University Press
- Gülder , Ömer L. Laminar burning velocities of methanol, ethanol and isooctane-air mixtures Symposium (international) on combustion 19 1 275 281 Elsevier 1982
- Davis , S. G. , and Law C. K. Determination of and fuel structure effects on laminar flame speeds of C1 to C8 hydrocarbons Combustion Science and Technology 140 1-6 1998 427 449
- Golovitchev , V.I. Mechanisms (combustion chemistry) 2000 http://www.tfd.chalmers.se/∼valeri/MECH.html
- Turns , S.R. An introduction to combustion: concepts and applications 2000 New York WCB/McGraw-Hill
- Smith , G.P. et al. GRI-Mech 3.0. 2014. [EB/OL] http://www.me.berkeley.edu/gri_mech
- Vishwanathan , G. and Reitz , R. Numerical Predictions of Diesel Flame Lift-off Length and Soot Distributions under Low Temperature Combustion Conditions SAE Technical Paper 2008-01-1331 2008 10.4271/2008-01-1331
- Kong , S. , Sun Y. and Rietz R.D. Modeling Diesel Spray Flame Liftoff, Sooting Tendency, and NOx Emissions Using Detailed Chemistry With Phenomenological Soot Model Journal of Engineering for Gas Turbines and Power 2005 129 1 245 251
- Faeth , G.M. , Hsiang L.P. and Wu P.K. Structure and breakup properties of sprays International Journal of Multiphase Flow 1995 21 Supplement(0) 99 127
- Jorge , B. and André S. Experimental Study of Spray Dispersion and Wall Interaction 45th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit 2009 American Institute of Aeronautics and Astronautics Denver, Colorado
- Dec , J. A Conceptual Model of DI Diesel Combustion Based on Laser-Sheet Imaging* SAE Technical Paper 970873 1997 10.4271/970873
- Kiplimo , R. , Tomita , E. , Kawahara , N. , Zhou , S. et al. Effects of Injection Pressure, Timing and EGR on Combustion and Emissions Characteristics of Diesel PCCI Engine SAE Technical Paper 2011-01-1769 2011 10.4271/2011-01-1769
- Lechner , G.A. et al. Evaluation of a narrow spray cone angle, advanced injection timing strategy to achieve partially premixed compression ignition combustion in a diesel engine Evaluation 2005 1 0167
- Westbrook , C.K. Chemical kinetics of hydrocarbon ignition in practical combustion systems Proceedings of the Combustion Institute 2000 28 2 1563 1577
- Curran , H.J. et al. A Comprehensive Modeling Study of n-Heptane Oxidation Combustion and Flame 1998 114 1-2 149 177