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Cetane Number and Engine Speed Effects on Diesel HCCI Performance and Emissions
Technical Paper
2005-01-3723
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The effects of cetane number (CN) on homogeneous charge compression ignition (HCCI) performance and emissions were investigated in a single cylinder engine using intake air temperature for control. Blends of the diesel secondary reference fuels for cetane rating were used to obtain a CN range from 19 to 76. Sweeps of intake air temperature at a constant fueling were performed. Low CN fuels needed to be operated at higher intake temperatures than high CN fuels to achieve ignition. As the intake air temperature was reduced for a given fuel, the combustion phasing was retarded, and each fuel passed through a phasing point of maximum indicated mean effective pressure (IMEP). Early combustion phasing was required for the high CN fuels to prevent misfire, whereas the maximum IMEP for the lowest CN fuel occurred at a phasing 10 crank angle degrees (CAD) later. The high CN fuels exhibited a strong low temperature heat release (LTHR) event, accounting for more than 15% of the total heat release in some instances, while no LTHR was detected for fuels with CN ≤ 34. All of the fuels had comparable NOx emissions and pressure rise rates at their respective maximum IMEP timing, with NOx emissions below 6 ppm at 3.5 bar IMEP. At advanced combustion phasing, low CN fuels had significantly higher pressure rise rates and higher NOx emissions than the high CN fuels. At retarded phasing, the CO emissions for the high CN fuels were excessive, with a CO:UHC ratio of up to 8, while these remained <1 for low CN fuels. These results suggest that the products of LTHR, which are high in CO, are more sensitive to the quenching effects of cylinder expansion. Thus high CN fuels, which exhibit significant LTHR, require early combustion phasing, whereas low CN fuels can be retarded to later combustion phasing. Increasing engine speed had the effect of reducing the total LTHR. Further investigation showed that the LTHR rate is constant on a millisecond basis, so the effect of higher engine speed is to reduce the time allowed for the reaction without changing the rate of reaction.
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Szybist, J. and Bunting, B., "Cetane Number and Engine Speed Effects on Diesel HCCI Performance and Emissions," SAE Technical Paper 2005-01-3723, 2005, https://doi.org/10.4271/2005-01-3723.Also In
References
- Zhao, F. Asmus T.W. Assanis D.N. Dec J.E. Eng J.A. Najt P.M. Homogeneous Charge Compression Ignition (HCCI) Engines: Key Research and Development Issues 2003 Warrendale, PA Society of Automotive Engineers
- Kaneko, M. Morikawa K. Itoh J. Saishu Y. A Study on Homogeneous Charge Compression Ignition Gasoline Engines . JSME International Journal 2003 46 1 31 36
- Lu, X.-C. Chen W. Huang Z. A fundamental study on the control of the HCCI combustion and emissions by fuel design concept combined with controllable EGR. Part 1. The basic characteristics of HCCI combusition . Fuel 2005 84 1074 1083
- Lu, X.-C. Chen W. Huang Z. A fundamental study on the control of the HCCI combustion and emissions by fuel design concept combined with controllable EGR. Part 2. Effect of operating conditions and EGR on HCCI combustion . Fuel 2005 84 1084 1092
- Kawano, D. Naito H. Suzuki H. Ishii H. Hori S. Goto Y. Odaka M. Effects of Fuel Properties on Combustion and Exhaust Emissions of Homogeneous Charge Compression Ignition (HCCI) Engines Society of Automotive Engineers 2004 Technical Paper 2004-01-1966
- Christensen, M. Johansson B. Einewall P. Homogeneous Charge Compression Ignition (HCCI) Using Isooctane, Ethanol, and Natural Gas - A Comparison with Spark Ignition Operation Society of Automotive Engineers 1997 Technical Paper 972874
- Christensen, M. Johansson B. Influence of Mixture Quality on Homogeneous Charge Compression Ignition Society of Automotive Engineers 1998 Technical Paper 982454
- Christensen, M. Johansson B. AmnJus P. Mauss F. Supercharged Homogeneous Charge Compression Ignition Society of Automotive Engineers 1998 Technical Paper 980787
- Christensen, M. Hultqvist A. Johansson B. Demonstrating the Multi Fuel Capability of a Homogeneous Charge Compression Ignition Engine with Variable Compression Ratio Society of Automotive Engineers 1999 Technical Paper 1999-01-3679
- Oakley, A. Zhao H. Ladommatos N. Ma T. Dilution Effects on the Controlled Auto-Ignition (CAI) Combustion of Hydrocarbon and Alcohol Fuels Society of Automotive Engineers 2001 Technical Paper 2001-01-3606
- Song-Charng, K. Reitz R.D. Application of Detailed Chemistry and CFD for Predicting Direct Injection HCCI Engine Combustion and Emissions Proceedings of the Combustion Institute 2002 29 663 669
- Aroonsrisopon, T. Sohm V. Werner P. Foster D.E. Morikawa T. Lida M. An Investigation Into the Effect of Fuel Composition on HCCI Combustion Characteristics Society of Automotive Engineers 2002 Technical Paper 2002-01-2830
- Hiraya, K. Hasegawa K. Urushihara T. Iiyama A. Itoh T. A Study on Gasoline Fueled Compression Ignition Engine ∼ A Trial of Operation Region Expansion Society of Automotive Engineers 2002 Technical Paper 2002-01-0416
- Jeuland, N. Montagne X. Duret P. Engine and Fuel Related Issues of Gasoline CAI (Controlled Auto-Ignition) Combustion Society of Automotive Engineers 2003 Technical Paper 2003-01-1856
- Gray, A. W. Ryan T.W.I. Homogeneous Charge Compression Ignition (HCCI) of Diesel Fuel Society of Automotive Engineers 1997 Technical Paper 971676
- Duret, P. Gasoline CAE and Diesel HCCI: the Way towards Zero Emission with Major Engine and Fuel Technology Challenges Society of Automotive Engineers 2002 Technical Paper 2002-32-1787
- Shibata, G. Oyama K. Urushihara T. Nakano T. Correlation of Low Temperature Heat Release with Fuel Composition and HCCI Engine Combustion Society of Automotive Engineers 2005 Technical Paper 2005-01-0138
- Curran, H.J. Gaffuri P. Pitz W.J. Westbrook C.K. A Comprehensive Modeling Study of n-Heptane Oxidation Combustion and Flame 1998 114 149 177
- Marriott, C.D. Reitz R.D. Experimental Investigation of Direct Injection-Gasoline for Premixed Compression Ignited Combustion Phasing Control Society of Automotive Engineers 2002 Technical Paper 2002-01-0418
- Aroonsrisopon, T. Foster D.E. Morikawa K. Lida M. Comparison of HCCI Operating Ranges for Combinations of Intake Temperature, Engine Speed and Fuel Composition Society of Automotive Engineers 2002 Technical Paper 2002-01-1924
- Stone, R. Introduction to Internal Combustion Engines Third 1999 Warrendale, PA Society of Automotive Engineers, Inc. 641
- Leppard, W.R. The Chemical Origin of Fuel Octane Sensitivity Society of Automotive Engineers 1990 Technical Paper 902137
- Dec, J.E. Sjoberg M. Isolating the Effects of Fuel Chemistry on Combustion Phasing in an HCCI Engine and the Potential of Fuel Stratification for Ignition Control Society of Automotive Engineers 2004 Technical Paper 2004-01-0557
- Yetter, R.A. Dryer F.L. Inhibition of Moist Carbon Monoxide Oxidation by Trace Amounts of Hydrocarbons . Proceedings of the Combustion Institute 1992 24 757 767