This content is not included in your SAE MOBILUS subscription, or you are not logged in.
The Impact of Intake Dilution and Combustion Phasing on the Combustion Stability of a Diesel Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 01, 2014 by SAE International in United States
Annotation ability available
Conventionally, the diesel fuel ignites spontaneously following the injection event. The combustion and injection often overlap with a very short ignition delay. Diesel engines therefore offer superior combustion stability characterized by the low cycle-to-cycle variations. However, the enforcement of the stringent emission regulations necessitates the implementation of innovative diesel combustion concepts such as the low temperature combustion (LTC) to achieve ultra-low engine-out pollutants. In stark contrast to the conventional diesel combustion, the enabling of LTC requires enhanced air fuel mixing and hence a longer ignition delay is desired. Such a decoupling of the combustion events from the fuel injection can potentially cause ignition discrepancy and ultimately lead to combustion cyclic variations.
This work investigates the impact of exhaust gas recirculation and combustion phasing on the combustion stability and cyclic variations of a diesel engine while entering into the LTC operation regime using a single-injection fueling strategy. Experiments are conducted on a laboratory instrumented high compression ratio (18.2:1) diesel engine. The combustion phasing control and the application of moderate-to-high EGR are used to achieve ultra-low NOx and smoke emissions. The combustion characteristics and emission performance are presented. Cycle-resolved cylinder pressure measurements acquired for 200 engine cycles are used to evaluate indicated engine performance and apparent heat release parameters including ignition delay, burn duration, combustion phasing, and the pressure rise rate. The results indicate that the enabling of single-injection diesel LTC demands precise control over operating conditions and it is sensitive to minor variations in the injection timing and the amount of EGR applied. However, when successfully controlled, this combustion mode exhibits cyclic variability comparable to conventional diesel combustion.
CitationDivekar, P., Han, X., Yu, S., Chen, X. et al., "The Impact of Intake Dilution and Combustion Phasing on the Combustion Stability of a Diesel Engine," SAE Technical Paper 2014-01-1294, 2014, https://doi.org/10.4271/2014-01-1294.
- Kimura , S. , Aoki , O. , Ogawa , H. , Muranaka , S. et al. New Combustion Concept for Ultra-Clean and High-Efficiency Small DI Diesel Engines SAE Technical Paper 1999-01-3681 1999 10.4271/1999-01-3681
- Shimazaki , N. , Tsurushima , T. , and Nishimura , T. Dual Mode Combustion Concept With Premixed Diesel Combustion by Direct Injection Near Top Dead Center SAE Technical Paper 2003-01-0742 2003 10.4271/2003-01-0742
- Zheng , M. , Tan , Y. , Mulenga , M. , and Wang , M. Thermal Efficiency Analyses of Diesel Low Temperature Combustion Cycles SAE Technical Paper 2007-01-4019 2007 10.4271/2007-01-4019
- Zheng , M. and Kumar , R. Implementation of Multiple-Pulse Injection Strategies to Enhance the Homogeneity for Simultaneous low-NOx and low-soot Diesel Combustion Int. J. Thermal Sciences 48 9 1829 1841 2009 10.1016/j.ijthermalsci.2009.02.009
- Splitter , D. , Hanson , R. , Kokjohn , S. , and Reitz , R. Reactivity Controlled Compression Ignition (RCCI) Heavy-Duty Engine Operation at Mid-and High-Loads with Conventional and Alternative Fuels SAE Technical Paper 2011-01-0363 2011 10.4271/2011-01-0363
- Akihama , K. , Takatori , Y. , Inagaki , K. , Sasaki , S. et al. Mechanism of the Smokeless Rich Diesel Combustion by Reducing Temperature SAE Technical Paper 2001-01-0655 2001 10.4271/2001-01-0655
- Dec , J. Advanced Compression-ignition Engines-Understanding The In-cylinder Processes Combustion Institute 32 2 2727 2742 2009 10.1016/j.proci.2008.08.008
- Zheng , M. , Reader , G.T. , Asad , U. , Tan , Y. , Wang M. Adaptive Control to Improve Low Temperature Diesel Engine Combustion The 7th COMODIA International Conference on Modelling and Diagnostics for Advanced Engine Systems Hokkaido University Sapporo, Japan 2008
- Li , H. , Neill , W. , Guo , H. , Chippior , W. The NOx and N2O Emission Characteristics of an HCCI Engine Operated With n-Heptane J. Energy Resour. Technology 134 1 011101 011101-9 2011 10.1115/1.4005243
- Flynn , P. , Durrett , R. , Hunter , G. , zur Loye , A. et al. Diesel Combustion: An Integrated View Combining Laser Diagnostics, Chemical Kinetics, And Empirical Validation SAE Technical Paper 1999-01-0509 1999 10.4271/1999-01-0509
- Heywood , J.B. Internal combustion engine fundamentals 1st McGraw-Hill 1988
- Ball , J.K. Cycle-by-cycle Variation in Spark Ignition Internal Combustion Engines PhD Dissertation University of Oxford 1998
- McGhee , M. , Shayler , P. , LaRocca , A. , Murphy , M. et al. The Influence of Injection Strategy and Glow Plug Temperature on Cycle by Cycle Stability Under Cold Idling Conditions for a Low Compression Ratio, HPCR Diesel Engine SAE Int. J. Engines 5 3 923 937 2012 10.4271/2012-01-1071
- Selim , M. Effect of Engine Parameters and Gaseous Fuel Type on the Cyclic Variability of Dual Fuel Engines J. Fuel 84 7-8 961 971 2005 10.1016/j.fuel.2004.11.023
- Özkan , M. Comparative Study of the Effect of Biodiesel and Diesel Fuel on a Compression Ignition Engine's Performance, Emissions, and Its Cycle by Cycle Variations J. Energy & Fuels 21 6 3627 3636 2007
- Rakopoulos , C.D. , Rakopoulos , D.C. , Giakoumis , E.G. , Dimaratos , A.M. Investigation of the Combustion of Neat Cottonseed Oil or its Neat Bio-diesel in a HSDI Diesel Engine by Experimental Heat Release and Statistical Analyses J. Fuel 89 12 3814 3826 10.1016/j.fuel.2010.07.012
- Asad , U. , Kumar , R. , Han , X. , Zheng , M. Precise Instrumentation of a Diesel Single-cylinder Research Engine J. Measurement 44 1261 1278 2011 10.1016/j.measurement.2011.03.028
- Divekar , P. , Asad , U. , Han , X. , Chen , X. , Zheng , M. Study of cylinder charge control for enabling low temperature combustion in diesel engines Proceedings of the ASME 2013 Internal Combustion Engine Division's Fall Technical Conference, ICEF2013 October 13 16 2013
- Zheng , M. , Asad , U. , Reader , G.T. , Tan , Y. , Wang , M. Energy Efficiency Improvement Strategies for a Diesel Engine in Low-temperature Combustion Int. J. Energy Res. 33 8 28 2009 10.1002/er.1464