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Optical and Numerical Investigation of Pre-Injection Reactions and Their Effect on the Starting of a Diesel Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 20, 2009 by SAE International in United States
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Ultraviolet chemiluminescence has been observed in a diesel engine cyclinder during compression, but prior to fuel injection under engine starting conditions. During a portion of the warm-up sequence, the intensity of this emission exhibits a strong correlation to the phasing of the subsequent combustion. Engine exhaust measurements taken from a continuously misfiring, motored engine confirm the generation of formaldehyde (HCHO) in such processes. Fractions of this compound are expected to be recycled as residual to participate in the following combustion cycle. Spectral measurements taken during the compression period prior to fuel injection match the features of Emeleus' cool flame HCHO bands that have been observed during low temperature heat release reactions occurring in lean HCCI combustion. That the signal from the OH* bands is weak implies a buildup of HCHO during compression. To investigate the combined effects of wall temperature, equivalence ratio and HCHO concentration on combustion phasing, a two-zone CFD-kinetics model was employed utilizing the second version of the Lawrence Livermore National Laboratory detailed n-heptane mechanism [1,2]. The effect of these three parameters was simulated over a parameter space spanning equivalence ratios from 0.1 to 4, wall temperatures from 60 °C to 140 °C, and HCHO concentrations between 0 and 300 ppm. Results suggest HCHO has a retarding effect on autoignition under lean conditions, yet an enhancing effect at equivalence ratios greater than 0.5. The advancing effect is most pronounced at rich, lower temperature conditions. It is estimated that under certain conditions, the presence of HCHO in concentrations of 300 ppm, as is possible following a misfire, has the equivalent effect on combustion phasing as an increase in the surface wall temperature by 12 °C or by a one °C increase in the charge temperature prior to compression.
- Marcis Jansons - Wayne State University
- Radu Florea - Wayne State University
- Kan Zha - Wayne State University
- Fadi Estefanous - Wayne State University
- Elena Florea - Wayne State University
- Dinu Taraza - Wayne State University
- Walter Bryzik - Wayne State University
- Naeim Henein - Wayne State University
- Laura Hoogterp - US Army TARDEC
CitationJansons, M., Florea, R., Zha, K., Estefanous, F. et al., "Optical and Numerical Investigation of Pre-Injection Reactions and Their Effect on the Starting of a Diesel Engine," SAE Technical Paper 2009-01-0648, 2009, https://doi.org/10.4271/2009-01-0648.
Combustion and Flow Diagnostics and Fundamental Advances in Thermal and Fluid Sciences, 2009
Number: SP-2238; Published: 2009-04-20
Number: SP-2238; Published: 2009-04-20
- Curran H. J., Gaffuri P., Pitz W. J. and Westbrook C. K., “A Comprehensive Modeling Study of N-Heptane Oxidation”, Combustion and Flame, 114 (1-2), pg. 149-177, 1998.
- Curran H. J., Gaffuri P., Pitz W. J. and Westbrook C. K., “A Comprehensive Modeling Study of Iso-Octane Oxidation”, Combustion and Flame, 129, pg. 253-280, 2002.
- Chang J., Filipi Z., Assanis D., Kuo T.-W., Najt P. and Rask R., “Characterizing the Thermal Sensitivity of a Gasoline Homogeneous Charge Compression Ignition Engine with Measurements of Instantaneous Wall Temperature and Heat Flux”, International Journal of Engine Research, 6, pg. 289-309, 2005.
- 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 No. 2002-01-1309, 2002.
- Dec J. E. 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 Paper No. 2004-01-0557, 2004.
- Heywood J. B., Internal Combustion Engine Fundamentals, McGraw-Hill, New York, 1988.
- Sjöberg M. and Dec J. E., “Smoothing HCCI Heat-Release Rates Using Partial Fuel Stratification with Two-Stage Ignition Fuels”, SAE Paper No. 2006-01-0629, 2006.
- Aceves S. M., Flowers D. L., Westbrook C. K., Smith J. R., Pitz W., Dibble R., Christensen M. and Johansson B., “A Multi-Zone Model for Prediction of HCCI Combustion and Emissions”, SAE Paper No. 2000-01-0327, 2000.
- Babajimopoulos A., Assanis D. N. and Fiveland S. B., “An Approach for Modeling the Effects of Gas Exchange Processes on HCCI Combustion and Its Application in Evaluating Variable Valve Timing Control Strategies”, SAE Paper No. 2002-01-2829, 2002.
- Babajimopoulos A., Lavoie G. A. and Assanis D. N., “Modeling HCCI Combustion with High Levels of Residual Gas Fraction - a Comparison of Two VVA Strategies”, SAE Paper No. 2003-01-3220, 2003.
- Chang J., Guralp O., Filipi Z. S., Assanis D. N., Kuo T.-W., Najt P. and Rask R., “New Heat Transfer Correlation for an HCCI Engine Derived from Measurements of Instantaneous Surface Heat Flux”, SAE Paper No. 2004-01-2996, 2004.
- Kashdan J. T. and Papagni J.-F., “LIF Imaging of Auto-Ignition and Combustion in a Direct-Injection, Diesel-Fuelled HCCI Engine”, SAE Paper No. 2005-01-3739, 2005.
- Ladommatos N., Abdelhalim S. M., Zhao H. and Hu Z., “The Dilution, Chemical and Thermal Effects of Exhaust Gas Recirculation on Diesel Engine Emissions - Part 4: Effects of Carbon Dioxide and Water Vapor”, SAE Paper No. 971660, 1997.
- Maiboom A., Tauzia X., Hetet J.-F., Cormerais M., Tounsi M., Jaine T. and Blanchin S., “Various Effects of EGR on Combustion and Emissions on an Automotive DI Diesel Engine: Numerical and Experimental Study”, SAE Paper No. 2007-01-1834, 2007.
- Nakano M., Mandokoro Y., Kubo S. and Yamazaki S., “Effects of Exhaust Gas Recirculation in Homogeneous Charge Compression Ignition Engines”, International Journal of Engine Research, 1 (3), pg. 269-279, 2000.
- Sjöberg M. and Dec J. E., “EGR and Intake Boost for Managing HCCI Low-Temperature Heat Release over Wide Ranges of Engine Speed”, SAE Paper No. 2007-01-0051, 2007.
- Sjöberg M. and Dec J. E., “Comparing Late-Cycle Autoignition Stability for Single and Two-Stage Ignition Fuels in HCCI Engines”, Proceedings of the Combustion Institute, 31, pg. 2895-2902, 2007.
- Sjöberg M., Dec J. E. and Hwang W., “Thermodynamic and Chemical Effects of EGR and Its Constituents on HCCI Combustion”, SAE Paper No. 2007-01-0207, 2007.
- Urushihara T., Hiraya K., Kakuhou A. and Itoh T., “Expansion of HCCI Operating Region by the Combination of Direct Fuel Injection, Negative Valve Overlap and Internal Fuel Reformation”, SAE Paper No. 2003-01-0749, 2003.
- Willand J., Nieberding R.-G., Vent G. and Enderle C., “The Knocking Syndrome - Its Cure and Its Potential”, SAE Paper No. 982483, 1998.
- Liu Z. and Karim G. A., “An Examination of the Role of Residual Gases in the Combustion Processes of Motored Engines Fueled with Gaseous Fuels”, SAE Paper No. 961081, 1996.
- Olsson J.-O., Tunestal P., Johansson B., Fiveland S., Agama R., Willi M. and Assanis D., “Compression Ratio Influence on Maximum Load of a Natural Gas Fueled HCCI Engine”, SAE Paper No. 2002-01-0111, 2002.
- Sjöberg M., Dec J. E., Babjimopoulos A. and Assanis D., “Comparing Enhanced Natural Thermal Stratification against Retarded Combustion Phasing for Smoothing of HCCI Heat-Release Rates”, SAE Paper No. 2004-01-2994, 2004.
- Subramanian G. and Pirez Da Cruz A., “Chemical Impact of CO and H2 Addition on the Auto-Ignition Delay of Homogeneous N-Heptane/Air Mixtures”, Combustion Science and Technology, 179, pg. 1937-1962, 2007.
- Yamaya Y., Furutani M. and Ohta Y., “Premixed Compression Ignition of Formaldehyde-Doped Lean Butane/Air Mixtures in a Wide Range of Temperature”, SAE Paper No. 2004-01-1977, 2004.
- Chemkin-Pro, Release 4.5, Reaction Design: San Diego, 2008, http://www.reactiondesign.com
- Liu Z. and Karim G. A., “An Examination of the Role of Residual Gases in the Combustion Processes of Motored Engines Fuelled with Gaseous Fuels”, SAE Paper No. 961081, 1996.
- Gardner T. and Henein N. A., “Diesel Starting: A Mathematical Model”, SAE Transactions Journal of Engines, 1 (97), pg. 6.728-6.740, 1988.
- Phatak R. and Nakamura T., “Cold Startability of Open-Chamber Direct-Injection Part I: Measurement Technique and Compression Ratio”, SAE Paper No. 831335, 1983.
- Andree A. and Pachernegg S. J., “Ignition Conditions in Diesel Engines”, SAE Paper No. 690253, 1969.
- Austen A. E. and Lyn W. T. in: Some Investigations on Cold-Starting Phenomena in Diesel Engines, Proceedings of the Institution of Mechanical Engineers, 1959-60; 1959-60.
- Han Z. P., Henein N. A. and Nitu B., “Diesel Engine Cold Start Combustion Instability and Control Strategy”, SAE Paper No. 2001-01-1237, 2001.
- Ueda T., Zhang L. and Gabe M., “Improvement of the Cold Startability of Common Rail Injection System by Pilot Injection in a HD Diesel Engine”, SAE Paper No. 1999-08-0355, 1999.
- Jansons M., Florea R., Estefanous F., Taraza D., Henein N. A. and Bryzik W., “Chemiluminescence Imaging of Pre-Injection Reactions During Engine Starting”, International Journal of Vehicle Design, SP2-26 (Combustion, Fuels and Emission Control in Internal Combustion Engines), 2008.
- Jansons M., Brar A., Estafanous F., Florea R., Taraza D., Henein N. and Bryzik W., “Experimental Investigation of Single and Two-Stage Ignition in a Diesel Engine”, SAE Paper No. 2008-01-1071, 2008.
- Pearse R. W. B. and Gaydon A. G., The Identification of Molecular Spectra, Chapman and Hall, London, 1976.
- Dec J. E., “Chemiluminescence Imaging of Autoignition in a Di Diesel Engine”, SAE Paper No. 982685, 1998.
- Gaydon A. G., Flames; Their Structure, Radiation and Temperature, Chapman and Hall, London, 1970.
- Gaydon A. G., The Spectroscopy of Flames, John Wiley & Sons, New York, 1957.
- Sheinson R. S. and Williams F. W., “Chemiluminescence Spectra from Cool and Blue Flames: Electrically Excited Formaldehyde”, Combustion and Flame, 21, pg. 221-230, 1973.
- Hwang W., Dec J. E. and Sjöberg M., “Spectroscopic and Chemical-Kinetic Analysis of the Phases of HCCI Autoignition and Combustion for Single- and Two-Stage Ignition Fuels”, Combustion and Flame, pg. 387-409, 2008.
- Hildingsson L., Persson H., Johansson B., Collin R., Nygren J., Richter M., Alden M., Hasegawa R. and Yanagihara H., “Optical Diagnostics of HCCI and Low-Temperature Diesel Using Simultaneous 2-D PLIF of OH and Formaldehyde”, SAE Paper No. 2004-01-2949, 2004.
- Hildingsson L., Persson H., Johansson B., Collin R., Nygren J., Richter M., Alden M., Hasegawa R. and Yanagihara H., “Optical Diagnostics of Hcci and Unibus Using 2-D PLIF of OH and Formaldehyde”, SAE Paper No. 2005-01-0175, 2005.
- Hajireza S., Regner G., Christie A., Egert M. and Mittermaier H., “Application of CFD Modeling in Combustion Bowl Assessment of Diesel Engines Using Doe Methodology”, SAE Paper No. 2006-01-3330, 2006.
- Hessel R. P., Aceves S. M. and Flowers D. L., “A Comparison of the Effect of Combustion Chamber Surface Area and In-Cylinder Turbulence on the Evolution of Gas Temperature Distribution from IVC to SOC: A Numerical and Fundamental Study”, SAE Paper No. 2006-01-0869, 2006.