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Analysis of Thermal Stratification Effects in HCCI Engines Using Large Eddy Simulations and Detailed Chemical Kinetics
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 03, 2018 by SAE International in United States
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The operating range of Homogeneous Charge Compression Ignition (HCCI) engines is limited to low and medium loads by high heat release rates. Negative Valve Overlap (NVO) can be used to facilitate ignition of high octane number fuels and control pressure rise rates by diluting the mixture with hot residual gas and introducing some thermal stratification. Controlling the thermal stratification results in sequential autoignition, reduced heat release rates, and operating range extension. Therefore, fundamental understanding of thermal stratification in HCCI combustion with high levels of internal residuals is necessary, along with the development of appropriate models to simulate thermal stratification and its effects on HCCI combustion.
A 3-D Computational Fluid Dynamics (CFD) model of a 2.0 L GM Ecotec engine (LNF type) engine cylinder, modified for HCCI combustion, was developed using CONVERGE CFD. Large Eddy Simulations (LES) were combined with combustion modeling using detailed chemical kinetics. Fifteen consecutive cycles were simulated and the results were validated against individual cycle data of 300 consecutive experimental cycles. The results showed a competing effect between mixing of fresh charge and residuals, and heat transfer-induced thermal stratification during the compression stroke. A large amount of thermal stratification was found at the onset of autoignition, resulting in a skewed temperature distribution. Compositional stratification was minimal despite the large residual gas fraction. Thermal stratification resulted in sequential autoignition, with the hotter regions igniting earlier. Significant spatial variability of thermal stratification on a cyclic basis was found, which did not affect the bulk thermal stratification. Heat release was found to depend predominantly on the bulk thermal stratification rather than the spatial distribution of thermal stratification.
CitationSofianopoulos, A., Rahimi Boldaji, M., Lawler, B., and Mamalis, S., "Analysis of Thermal Stratification Effects in HCCI Engines Using Large Eddy Simulations and Detailed Chemical Kinetics," SAE Technical Paper 2018-01-0189, 2018, https://doi.org/10.4271/2018-01-0189.
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- Onishi, S., et al., “Active Thermo-Atmosphere Combustion (ATAC) - A New Combustion Process for Internal Combustion Engines,” SAE Technical Paper 790501, 1979, doi:10.4271/790501.
- Yao, M., Zheng, Z., and Liu, H., “Progress and Recent Trends in Homogeneous Charge Compression Ignition (HCCI) Engines,” Progress in Energy and Combustion Science 35(5):398-437, 2009.
- Zhao, F., et al., “Homogeneous Charge Compression Ignition (HCCI) Engines,” SAE Int., 2003.
- Najt, P.M., and Foster, D.E., “Compression-Ignited Homogeneous Charge Combustion,” SAE Int.1983.
- Thring, R.H., “Homogeneous-Charge Compression-Ignition (HCCI) Engines,” SAE Technical Paper 892068, 1989, doi:10.4271/892068.
- Olsson, J.-O., et al., “The Effect of Cooled EGR on Emissions and Performance of a Turbocharged HCCI Engine,” SAE Technical Paper 2003-01-0743, 2003.
- Christensen, M., and Johansson, B., “Supercharged Homogeneous Charge Compression Ignition (HCCI) with Exhaust Gas Recirculation and Pilot Fuel,” SAE Technical Paper, 2000-01-1835, 2000.
- Sjöberg, M., Dec, J.E., and Hwang W., “Thermodynamic and Chemical Effects of EGR and Its Constituents on HCCI Autoignition,” SAE Technical Paper, 2007-01-0207, 2007, doi:10.4271/2007-01-0207.
- Cairns, A., and Blaxill, H., “The Effects of Combined Internal and External Exhaust Gas Recirculation on Gasoline Controlled Auto-ignition,” SAE Technical Paper 2005-01-0133, 2005.
- Haraldsson, G., et al., “HCCI Combustion Phasing with Closed-Loop Combustion Control Using Variable Compression Ratio in a Multi Cylinder Engine,” SAE Technical Paper 2003-01-1830, 2003.
- Hyvönen, J., Haraldsson G., and Johansson B., “Operating Conditions Using Spark Assisted HCCI Combustion During Combustion Mode Transfer to SI in a Multi-cylinder VCR-HCCI Engine,” SAE Technical Paper 2005-01-0109, 2005.
- Hyvönen, J., Haraldsson G., and Johansson B., “Operating Range in a Multi Cylinder HCCI Engine Using Variable Compression Ratio,” SAE Technical Paper 2002-01-2858, 2003
- Yap, D., et al., “Applying Boosting to Gasoline HCCI Operation with Residual Gas Trapping,” SAE Technical Paper 2005-01-2121, 2005.
- Dec, J.E. and Yang, Y., “Boosted HCCI for High Power without Engine Knock and with Ultra-Low NOx Emissions - Using Conventional Gasoline,” SAE Int. J. Eng. 3(1):750-767, 2010.
- Mamalis, S., et al., “Optimal Use of Boosting Configurations and Valve Strategies for High Load HCCI-A Modeling Study,” SAE Technical Paper 2012-01-1101, 2012.
- Mamalis, S. et al., “The Interaction between Compression Ratio, Boosting and Variable Valve Actuation for High Load Homogeneous Charge Compression Ignition: A Modeling Study,” International Journal of Engine Research 15(4):460-470, 2014.
- Mamalis, S. et al., “Comparison of Different Boosting Strategies for Homogeneous Charge Compression Ignition Engines-A Modeling Study,” SAE Int. J. Eng. 3(2010-01-0571):296-308, 2010.
- Rothamer, D.A. et al., “Simultaneous Imaging of Exhaust Gas Residuals and Temperature during HCCI Combustion,” Proceedings of the Combustion Institute 32(2):2869-2876, 2009.
- 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 Technical Paper 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 Technical Paper 2003-01-3220, 2003.
- Dec, J.E., Dernotte, J., and Ji, C., “Increasing the Load Range, Load-to-Boost Ratio, and Efficiency of Low-Temperature Gasoline Combustion (LTGC) Engines,” SAE Int. J. Eng.2017. 10(2017-01-0731).
- Lawler, B. et al., “Understanding the Effect of Operating Conditions on Thermal Stratification and Heat Release in a Homogeneous Charge Compression Ignition Engine,” Applied Thermal Engineering 112:392-402, 2017.
- Boldaji, M.R., et al., “CFD Simulations of the Effect of Water Injection Charecteristics Including Spray Pattern on Tsci: A New, Flexible, Advanced Combustion Concept,” Proceedings of the ASME 2017 Internal Combustion Engine Division Fall Technical Conference, In Press 2017 (ICEF2017-3662).
- Lawler, B. et al., “Thermally Stratified Compression Ignition: A New Advanced Low Temperature Combustion Mode with Load Flexibility,” Applied Energy 189:122-132, 2017.
- Sjöberg, M. and Dec J.E., “Smoothing HCCI Heat-Release Rates Using Partial Fuel Stratification with Two-Stage Ignition Fuels,” SAE International, 2006-01-0629, 2006.
- Yang, Y. et al., “Partial Fuel Stratification to Control HCCI Heat Release Rates: Fuel Composition and Other Factors Affecting Pre-Ignition Reactions of Two-Stage Ignition Fuels,” SAE Int. J. Eng. 4(1):1903-1920, 2011.
- Yang, Y. et al., “Tailoring HCCI Heat-Release Rates with Partial Fuel Stratification: Comparison of two-Stage and Single-Stage-Ignition Fuels,” Proceedings of the Combustion Institute 33(2):3047-3055, 2011.
- Kokjohn, S.L. et al., “Experiments and Modeling of Dual-Fuel HCCI and PCCI Combustion Using in-Cylinder Fuel Blending,” SAE International Journal of Engines 2(2009-01-2647):24-39, 2009.
- Hanson, R.M. et al., “An Experimental Investigation of Fuel Reactivity Controlled PCCI Combustion in a Heavy-Duty Engine,” SAE Int. J. Eng. 3(2010-01-0864):700-716, 2010.
- Kolodziej, C., et al., “Achieving Stable Engine Operation of Gasoline Compression Ignition Using 87 AKI Gasoline Down to Idle,” SAE Technical Paper, 2015, doi:10.4271/2015-01-0374.
- Kodavasal, J. et al. ,, “Computational Fluid Dynamics Simulation of Gasoline Compression Ignition,” Journal of Energy Resources Technology 137(3): 032212, 2015.
- Sjöberg, M., et al., “Comparing Enhanced Natural Thermal Stratification Against Retarded Combustion Phasing for Smoothing of HCCI Heat-Release Rates,” SAE Technical Paper 2004-01-2994, 2004.
- Sjöberg, M., Dec, J.E., and Cernansky, N.P., “Potential of Thermal Stratification and Combustion Retard for Reducing Pressure-Rise Rates in HCCI Engines, Based on Multi-zone Modeling and Experiments,” SAE Technical Paper 2005-01-0113, 2005.
- Dec, J.E. and Hwang, W., “Characterizing the Development of Thermal Stratification in an HCCI Engine Using Planar-Imaging Thermometry,” (Livermore, Sandia National Laboratories (SNL-CA), 2008).
- Snyder, J. et al., “PLIF Measurements of Thermal Stratification in an HCCI Engine under Fired Operation,” SAE Int. J. Eng. 4(2011-01-1291):1669-1688, 2011.
- Dronniou, N. and Dec, J.E., “Investigating the Development of Thermal Stratification from the Near-Wall Regions to the Bulk-Gas in an HCCI Engine with Planar Imaging Thermometry,” SAE Int. J. Eng. 5(2012-01-1111):1046-1074, 2012.
- Lawler, B. et al. ,, “Development of a Postprocessing Methodology for Studying Thermal Stratification in an HCCI Engine,” Journal of Engineering for Gas Turbines and Power 134(10): 102801, 2012.
- Lawler, B., et al., “Refinement and Validation of the Thermal Stratification Analysis: A Post-Processing Methodology for Determining Temperature Distributions in an Experimental HCCI Engine,” SAE Technical Paper 2014-01-1276, 2014.
- Lawler, B., et al., “Understanding the Effect of Wall Conditions and Engine Geometry on Thermal Stratification and HCCI Combustion,” Proceedings of the ASME 2014 Internal Combustion Engine Division Fall Technical Conference, ICEF2014-5687, Columbus, Indiana, USA, 2014.
- Komninos, N., “The Effect of Thermal Stratification on HCCI Combustion: A Numerical Investigation,” Applied Energy 139:291-302, 2015.
- Yu, R., et al., “Effect of Turbulence and Initial Temperature Inhomogeneity on Homogeneous Charge Compression Ignition Combustion,” SAE Technical Paper 2006-01-3318, 2006.
- Yu, R., et al., “Effect of Turbulence on HCCI Combustion,” SAE Technical Paper 2007-01-0183, 2007.
- Yu, R., et al., “Effect of Temperature Stratification on the Auto-ignition of Lean Ethanol/Air Mixture in HCCI Engine,” SAE Technical Paper 2008-01-1669, 2008.
- Kodavasal, J. et al., “The Effects of Thermal and Compositional Stratification on the Ignition and Duration of Homogeneous Charge Compression Ignition Combustion,” Combustion and Flame 162(2):451-461, 2015.
- Kodavasal, J. et al., “The Effect of Diluent Composition on Homogeneous Charge Compression Ignition Auto-Ignition and Combustion Duration,” Proceedings of the Combustion Institute 35(3):3019-3026, 2015.
- Joelsson, T., et al., “Effects of Negative Valve Overlap on the Auto-ignition Process of Lean Ethanol/Air Mixture in HCCI-Engines,” SAE Technical Paper 2010-01-2235, 2010, doi:10.4271/2010-01-2235.
- Joelsson, T. et al., “Large Eddy Simulation and Experiments of the Auto-Ignition Process of Lean Ethanol/Air Mixture in HCCI Engines,” SAE Int. J. Fuels Lubr 1(2008-01-1668):1110-1119, 2008.
- Schmitt, M. et al. ,, “Direct Numerical Simulation of Multiple Cycles in a Valve/Piston Assembly,” Physics of Fluids, 26(3):035105, 2014.
- Schmitt, M. et al. ,, “Investigation of Cycle-to-Cycle Variations in an Engine-like Geometry,” Physics of Fluids 26(12): 125104, 2014.
- Schmitt, M. et al., “Direct Numerical Simulation of the Effect of Compression on the Flow, Temperature and Composition under Engine-like Conditions,” Proceedings of the Combustion Institute 35(3):3069-3077, 2015.
- Schmitt, M. et al., “Investigation of Wall Heat Transfer and Thermal Stratification under Engine-Relevant Conditions Using DNS,” International Journal of Engine Research 17(1):63-75, 2016.
- Richards, K., Senecal, P., and Pomraning, E., “CONVERGE Manual (Version 2.3),” (Madison, Convergent Science Inc., 2016).
- Rutland, C., “Large-Eddy Simulations for Internal Combustion Engines - A Review,” International Journal of Engine Research 12:421-451, 2011.
- Celik, I., Yavuz, I., and Smirnov, A., “Large Eddy Simulations of in-Cylinder Turbulence for Internal Combustion Engines: A Review,” International Journal of Engine Research 2(2):119-148, 2001.
- Lesieur, M., Métais, O., and Comte, P., “Large-Eddy Simulations of Turbulence,” (Cambridge, Cambridge University Press, 2005).
- Pope, S.B., “Ten Questions Concerning the Large-Eddy Simulation of Turbulent Flows,” New Journal of Physics 6(1):35, 2004.
- Germano, M. et al., “A Dynamic Subgrid-Scale Eddy Viscosity Model,” Physics of Fluids A: Fluid Dynamics 3(7):1760-1765, 1991.
- Meneveau, C., Lund, T.S., and Cabot, W.H., “A Lagrangian Dynamic Subgrid-Scale Model of Turbulence,” Journal of Fluid Mechanics 319:353-385, 1996.
- Smagorinsky, J., “General Circulation Experiments with the Primitive Equations,” Monthly Weather Review 91(3):99-164, 1963.
- Piomelli, U., “Large-Eddy Simulation: Achievements and Challenges,” Progress in Aerospace Sciences 35(4):335-362, 1999.
- Issa, R.I., “Solution of the Implicitly Discretised Fluid Flow Equations by Operator-Splitting,” Journal of Computational Physics 62(1):40-65, 1986.
- Soave, G., “Equilibrium Constants from a Modified Redlich-Kwong Equation of State,” Chemical Engineering Science 27(6):1197-1203, 1972.
- Werner, H. and Wengle, H., “Large-Eddy Simulation of Turbulent Flow Over and around a Cube in a Plate Channel,” . In: Turbulent Shear Flows 8. (New York, Springer, 1993), 155-168.
- Senecal, P., et al., “A New Parallel Cut-Cell Cartesian CFD Code for Rapid Grid Generation Applied to in-Cylinder Diesel Engine Simulations,” SAE Technical Paper 2007-01-0159, 2007.
- Senecal, P., et al., “Multi-Dimensional Modeling of Direct-Injection Diesel Spray Liquid Length and Flame Lift-off Length Using CFD and Parallel Detailed Chemistry,” SAE Technical Paper 2003-03-03, 2003.
- Babajimopoulos, A. et al., “A Fully Coupled Computational Fluid Dynamics and Multi-Zone Model with Detailed Chemical Kinetics for the Simulation of Premixed Charge Compression Ignition Engines,” International Journal of Engine Research 6(5):497-512, 2005.
- Rutland, C., “Large-Eddy Simulations for Internal Combustion Engines - A Review,” International Journal of Engine Research, 2011, doi:10.1177/1468087411407248.
- Liu, Y.-D. et al., “Enhancement on a Skeletal Kinetic Model for Primary Reference Fuel Oxidation by Using a Semidecoupling Methodology,” Energy & Fuels 26(12):7069-7083, 2012.
- Namazian, M., and Heywood, J.B, “Flow in the Piston-Cylinder-Ring Crevices of a Spark-Ignition Engine: Effect on Hydrocarbon Emissions, Efficiency and Power,” SAE Technical Paper 820088, 1982.
- Kodavasal, J., et al., “Machine Learning Analysis of Factors Impacting Cycle-to-Cycle Variation in a Gasoline Spark-Ignited Engine,” In ASME 2017 Internal Combustion Engine Division Fall Technical Conference, 2017. American Society of Mechanical Engineers.
- Daniels, R.W., “Approximation Methods for Electronic Filter Design: With Applications to Passive, Active, and Digital Networks,” (New York, McGraw-Hill Companies, 1974).