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Efficiency and Emission Trade-Off in Diesel-Ethanol Low Temperature Combustion Cycles
Technical Paper
2015-01-0845
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
An experimental investigation of low temperature combustion (LTC) cycles is conducted with diesel and ethanol fuels on a high compression ratio (18.2:1), common-rail diesel engine. Two LTC modes are studied; near-TDC injection of diesel with up to 60% exhaust gas recirculation (EGR), and port injected ethanol ignited by direct injection of diesel with moderate EGR (30-45%). Indicated mean effective pressures up to 10 bar in the diesel LTC mode and 17.6 bar in the dual-fuel LTC mode have been realized. While the NOx and smoke emissions are significantly reduced, a thermal efficiency penalty is observed from the test results. In this work, the efficiency penalty is attributed to increased HC and CO emissions and a non-conventional heat release pattern. The influence of heat release phasing, duration, and shape, on the indicated performance is explained with the help of parametric engine cycle simulations.
Empirical and parametric analyses suggest that while HC and CO emissions are consistently high for the LTC test cases studied, their contribution to efficiency penalty largely depends on the engine load. The heat release profile has a significant effect on the maximum attainable thermal efficiency within the mechanical operating limits. Specifically, the thermal efficiency is the highest within a narrow combustion phasing window, identified as 7-12 °CA after top dead center for the test engine. A shorter burning duration has a positive effect on thermal efficiency while the peak cylinder pressure and pressure rise rate are negatively impacted. The heat release shaping and splitting have minimum effects on the thermal efficiency but influence the peak cylinder pressure rise rate. The results and discussion presented in this paper highlight the trade-offs experienced in enabling LTC with diesel and diesel-ethanol combination in comparison to the conventional diesel combustion.
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Divekar, P., Yang, Z., Ting, D., Chen, X. et al., "Efficiency and Emission Trade-Off in Diesel-Ethanol Low Temperature Combustion Cycles," SAE Technical Paper 2015-01-0845, 2015, https://doi.org/10.4271/2015-01-0845.Also In
References
- Johnson , T. Review of Diesel Emissions and Control SAE Int. J. Fuels Lubr. 3 1 16 29 2010 10.4271/2010-01-0301
- Kimura , S. , Aoki , O. , Kitahara , Y. , and Aiyoshizawa , E. Ultra-Clean Combustion Technology Combining a Low-Temperature and Premixed Combustion Concept for Meeting Future Emission Standards SAE Technical Paper 2001-01-0200 2001 10.4271/2001-01-0200
- Okude , K. , Mori , K. , Shiino , S. , and Moriya , T. Premixed Compression Ignition (PCI) Combustion for Simultaneous Reduction of NOx and Soot in Diesel Engine SAE Technical Paper 2004-01-1907 2004 10.4271/2004-01-1907
- Hasegawa , R. and Yanagihara , H. HCCI Combustion in DI Diesel Engine SAE Technical Paper 2003-01-0745 2003 10.4271/2003-01-0745
- Kook , S. , Bae , C. , Miles , P. , Choi , D. et al. The Influence of Charge Dilution and Injection Timing on Low-Temperature Diesel Combustion and Emissions SAE Technical Paper 2005-01-3837 2005 10.4271/2005-01-3837
- Asad , U. and Zheng , M. Efficacy of EGR and Boost in Single-Injection Enabled Low Temperature Combustion SAE Int. J. Engines 2 1 1085 1097 2009 10.4271/2009-01-1126
- Heywood J. B. Internal combustion engine fundamentals 930 Mcgraw-hill New York 1988
- Noehre , C. , Andersson , M. , Johansson , B. , and Hultqvist , A. Characterization of Partially Premixed Combustion SAE Technical Paper 2006-01-3412 2006 10.4271/2006-01-3412
- Dec J. E. Advanced compression-ignition engines-understanding the in-cylinder processes Proc. Combust. Inst. 32 2 2727 2742 2009
- Kokjohn , S. , Hanson , R. , Splitter , D. , and Reitz , R. Experiments and Modeling of Dual-Fuel HCCI and PCCI Combustion Using In-Cylinder Fuel Blending SAE Int. J. Engines 2 2 24 39 2010 10.4271/2009-01-2647
- Zhang , Y. , Sagalovich , I. , De Ojeda , W. , Ickes , A. et al. Development of Dual-Fuel Low Temperature Combustion Strategy in a Multi-Cylinder Heavy-Duty Compression Ignition Engine Using Conventional and Alternative Fuels SAE Int. J. Engines 6 3 1481 1489 2013 10.4271/2013-01-2422
- He B.-Q. , Shuai S.-J. , Wang J.-X. , and He H. The effect of ethanol blended diesel fuels on emissions from a diesel engine Atmos. Environ. 37 35 4965 4971 Nov. 2003
- Doğan O. The influence of n-butanol/diesel fuel blends utilization on a small diesel engine performance and emissions Fuel 90 7 2467 2472 Jul. 2011
- Reitz R. D. and Duraisamy G. Review of high efficiency and clean reactivity controlled compression ignition (RCCI) combustion in internal combustion engines Prog. Energy Combust. Sci.
- Asad U. , Kumar R. , Han X. , and Zheng M. Precise instrumentation of a diesel single-cylinder research engine Measurement 44 7 1261 1278 Aug. 2011
- Material safety data sheet - Diesel fuel. http://www.online.petro-canada.ca/datasheets/en_CA/w104.pdf 14 Jan 2015
- Material safety data sheet - Ethyl alcohol. http://ccc.uwindsor.ca/eRPortal/ItemImages%5CCHEM1443-COMALC09.pdf 14 Jan 2015
- Dillon H. E. and Penoncello S. G. A Fundamental Equation for Calculation of the Thermodynamic Properties of Ethanol Int. J. Thermophys. 25 2 321 335 Mar. 2004
- Benson R. S. and Whitehouse N. D. Internal Combustion Engines Pergamon Press 1983
- Mcbride , Bonnie J. ; Sanford Gordon ,; Reno , Martin A. Coefficients for calculating thermodynamic and transport properties of individual species NASA Tech. Doc. Oct. 1993
- Divekar P. , Asad U. , Han X. , Chen X. , and Zheng M. Study of Cylinder Charge Control for Enabling Low Temperature Combustion in Diesel Engines J. Eng. Gas Turbines Power 136 9 091503 Mar. 2014
- 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
- Sjöberg , M. , Dec , J. , Babajimopoulos , A. , and Assanis , D. Comparing Enhanced Natural Thermal Stratification Against Retarded Combustion Phasing for Smoothing of HCCI Heat-Release Rates SAE Technical Paper 2004-01-2994 2004 10.4271/2004-01-2994
- Musculus M. P. B. , Miles P. C. , and Pickett L. M. Conceptual models for partially premixed low-temperature diesel combustion Prog. Energy Combust. Sci. 39 2 3 246 283 Apr. 2013
- Zheng , M. , Kumar , R. , Tan , Y. , and Reader , G. Heat Release Pattern Diagnostics to Improve Diesel Low Temperature Combustion SAE Int. J. Fuels Lubr. 1 1 1242 1258 2009 10.4271/2008-01-1726
- Saxena S. and Bedoya I. D. Fundamental phenomena affecting low temperature combustion and HCCI engines, high load limits and strategies for extending these limits Prog. Energy Combust. Sci. 39 5 457 488 Oct. 2013