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Isolating the Effects of Fuel Chemistry on Combustion Phasing in an HCCI Engine and the Potential of Fuel Stratification for Ignition Control
Technical Paper
2004-01-0557
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
An investigation has been conducted to determine the relative magnitude of the various factors that cause changes in combustion phasing (or required intake temperature) with changes in fueling rate in HCCI engines. These factors include: fuel autoignition chemistry and thermodynamic properties (referred to as fuel chemistry), combustion duration, wall temperatures, residuals, and heat/cooling during induction. Based on the insight gained from these results, the potential of fuel stratification to control combustion phasing was also investigated.
The experiments were conducted in a single-cylinder HCCI engine at 1200 rpm using a GDI-type fuel injector. Engine operation was altered in a series of steps to suppress each of the factors affecting combustion phasing with changes in fueling rate, leaving only the effect of fuel chemistry. This involved the use of two novel techniques: 1) alternate-firing operation to remove changes in wall temperature and residuals; and 2) a method for determining the effective intake temperature to remove the effect of heating/cooling during induction.
Three fuels were examined. Iso-octane was found to have only a small change in autoignition chemistry with fueling rate; gasoline had a change just slightly larger than iso-octane; and PRF80 had a large change, due to its significant cool-flame chemistry. Comparison of the data with chemical-kinetic modeling showed that the detailed iso-octane mechanism matches the trends well, but that the detailed PRF mechanism does not. The experimental results indicate that engine management becomes more complicated for fuels with cool-flame chemistry. For PRF80, combustion phasing changes immediately with changes in fueling, whereas sudden changes in fueling have little effect on the combustion phasing for iso-octane or gasoline. However, the results also show that the potential for ignition control by fuel stratification is much larger for PRF80. Stratification significantly and rapidly shifts combustion phasing with PRF80, but not with iso-octane. Charge stratification was also found to be effective for improving combustion efficiency at low-load conditions.
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Citation
Dec, J. and Sjöberg, M., "Isolating the Effects of Fuel Chemistry on Combustion Phasing in an HCCI Engine and the Potential of Fuel Stratification for Ignition Control," SAE Technical Paper 2004-01-0557, 2004, https://doi.org/10.4271/2004-01-0557.Also In
Homogeneous Charge Compression Ignition (Hcci) Combustion 2004
Number: SP-1819; Published: 2004-03-08
Number: SP-1819; Published: 2004-03-08
References
- Sjöberg, M. Dec, J. E. “Combined Effects of Fuel-Type and Engine Speed on Intake Temperature Requirements and Completeness of Bulk-Gas Reactions in an HCCI Engine,” SAE Paper 2003-01-3173 2003
- Christensen, M. Hultqvist, A. Johansson, B. “Demonstrating the Multi Fuel Capability of a Homogeneous Charge Compression Ignition Engine with Variable Compression Ratio,” SAE Paper 1999-01-3679 1999
- Haraldsson, G. Tunestål, P. Johansson, B. Hyvönen, J. “HCCI Combustion Phasing in a Multi Cylinder Engine Using Variable Compression Ratio,” SAE Paper 2002-01-2858 2002
- Kaahaaina, N. B. Simon, A. J. Caton, P. A. Edwards, C. F. “Use of Dynamic Valving to Achieve Residual-Affected Combustion,” SAE Paper 2001-01-0549 2001
- Law, D Kemp, D. Allen, J. Kirkpatrick G. Copland T. “Controlled Combustion in an IC-Engine with a Fully Variable Valve Train,” SAE Paper 2001-01-0251 2001
- Agrell, F. Ångström, H-E. Eriksson, B. Wikander, J. Linderyd, J. “Integrated Simulation and Engine Test of Closed Loop HCCI Control by Aid of Variable Valve Timings,” SAE Paper 2003-01-0748 2003
- Martinez-Frias, J. Aceves, S. M. Flowers, D. L. Smith, J. R. Dibble, R. “HCCI Engine Control by Thermal Management,” SAE Paper 2000-01-2869 2000
- Yang, J. Culp, T. Kenney, T. “Development of a Gasoline Engine System Using HCCI Technology - The Concept and the Test Results,” SAE Paper 2002-01-2832 2002
- Marriott, C. D. Reitz, R. D. “Experimental Investigation of Direct Injection-Gasoline for Premixed compression Ignited Combustion Phasing Control,” SAE Paper 2002-01-0418 2002
- Kaiser, E. W. Yang, J. Culp, T. Xu, N. Maricq, M. M. “HCCI Engine-Out Emissions - Does Flame Propagation Occur in HCCI,” Int. J. Engine Research 3 185 195 2002
- Dec, J.E. Sjöberg, M. “A Parametric Study of HCCI Combustion - the Sources of Emissions at Low Loads and the Effects of GDI Fuel Injection,” SAE Paper 2003-01-0752 2003
- Olsson, J-O. Tunestål, P. Ulfvik, J. Johansson, B. “The Effect of Cooled EGR on Emissions and Performance of a Turbocharged HCCI Engine,” SAE Paper 2003-01-0743 2003
- Heywood, J. B. Internal Combustion Engine Fundamentals McGraw-Hill New York 1988
- Dec, J. E. “A Computational Study of the Effects of Low Fuel Loading and EGR on Heat Release Rates and Combustion Limits in HCCI Engines,” SAE Paper 2002-01-1309 2002
- Kee R. J. Rupley F. M. Miller J. A. Coltrin M. E. Grcar J. F. Meeks E. Moffat H. K. Lutz A. E. Dixon-Lewis G. Smooke M. D. Warnatz J. Evans G. H. Larson R. S. Mitchell R. E. Petzold L. R. Reynolds W. C. Caracotsios M. Stewart W. E. Glarborg P. Chemkin Collection, Release 3.5 Reaction Design, Inc. San Diego, CA 1999
- Lutz, A. E. Kee, R. J. Miller, J. A. “Senkin: A FORTRAN Program for Predicting Homogeneous Gas Phase Chemical Kinetics with Sensitivity Analysis,” Sandia National Laboratories Report No. SAND87-8248
- Curran, H. J. Gaffuri, P. Pitz, W. J. Westbrook, C. K. “A Comprehensive Modeling Study of Iso-Octane Oxidation,” Combust. Flame 129 253 280 2002
- Curran, H. J. Gaffuri, P. Pitz, W. J. Westbrook, C. K. “A Comprehensive Modeling Study of n-Heptane Oxidation,” Combust. Flame 114 149 177 1998
- Pitz, W. J. Lawrence Livermore National Laboratory 2003
- Sjöberg, M. Dec, J. E. “An Investigation of the Relationship between Measured Intake Temperature, BDC Temperature, and Combustion Phasing for Premixed and DI HCCI Engines,” SAE 2004
- Westbrook, C. K. “Chemical Kinetics of Hydrocarbon Ignition in Practical Combustion Systems,” Proceedings of the Combustion Institute 28 1563 1577 2000
- Kelly-Zion, P. L. Dec, J. E. “A Computational Study of the Effect of Fuel-Type on Ignition Time in HCCI Engines,” Proc. Combust. Inst. 28 1187 1194 2000
- Anderson, R. W. Yang, J. Brehob, D. D. Vallance, J. K. Whiteaker, R. M. “Understanding the Thermodynamics of Direct Injection Spark Ignition (DISI) Combustion Systems: An Analytical and Experimental Investigation,” SAE Paper 962018 1996