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Experimental Evaluation of Reduced Kinetic Models for the Simulation of Knock in SI Engines
Technical Paper
2011-24-0033
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Downsizing by turbo charging is a current approach for the reduction of fuel consumption of Spark Ignition (SI) engines. For downsized engines compression ratio has to be set as high as possible to achieve substantial gains in thermodynamic efficiency. Unfortunately, the possibility to take full advantages offered by downsizing is limited by knock phenomenon, which imposes constraints both on supercharging and compression ratios.
Quasi-dimensional and multidimensional simulation can play a role of increasing importance for the design and the optimization of future engine prototypes more and more based on advanced combustion concepts, provided that well proven tools for knock simulation may be available. In this regard, a number of detailed and semi-detailed kinetic schemes have been recently proposed to simulate the auto-ignition and combustion in wide ranges of temperature, pressure and air fuel ratio typical of different experimental approaches, such as: flow reactors, constant volume bombs, rapid compression machines, shock tubes, test engines. However, at moment, the use of large kinetic models is limited, particularly in multidimensional simulation, because of the enormous calculation effort required.
On the other hand, different kinds of reduced models (skeletal, global, etc.) have been proposed, but they can be effectively used only on defined ranges of temperature, pressure and air fuel ratio. Thus, to set up reduced models, proper experiments are required for each field of interest.
In this scenario, an experimental procedure to evaluate the auto-ignition behavior of different fuels in conditions similar to the ones of the end gas of SI engines is proposed in this paper. A CFR engine was used because of his flexibility and of his wide diffusion. For all tests, carried out using iso-octane as fuel, inlet temperature was controlled at 423 K, the engine speed set at 900 (rpm), and the relative air/fuel ratio varied in a wide range, from rich (0.74) to lean (1.51). For each test condition, the engine was motored and compression ratio was varied until auto-ignition was induced. The internal EGR and other not measurable parameters were estimated with the aid of a 1-D commercial code, whose user combustion module was customized with a FORTRAN routine developed by the authors. Numerical simulations were carried out using two reduced mechanisms due respectively to Tanaka [13] and to Golovitchev [16], and their capability of predicting auto-ignition was evaluated by comparison with experiments.
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Giglio, V., Police, G., Rispoli, N., Iorio, B. et al., "Experimental Evaluation of Reduced Kinetic Models for the Simulation of Knock in SI Engines," SAE Technical Paper 2011-24-0033, 2011, https://doi.org/10.4271/2011-24-0033.Also In
References
- Heywood, J. B. “Internal Combustion Engine Fundamentals” McGraw-Hill 0-07-100499-8 1988
- Nates, R. Yates, A. “Knock Damage Mechanisms in Spark-Ignition Engines,” SAE Technical Paper 942064 1994 10.4271/942064
- Fitton, J. Nates, R. “Knock Erosion in Spark-Ignition Engines,” SAE Technical Paper 962102 1996 10.4271/962102
- Duchaussoy, Y. Lefebvre, A. Bonetto, R. “Dilution Interest on Turbocharged SI Engine Combustion,” SAE Technical Paper 2003-01-0629 2003 10.4271/2003-01-0629
- Lake, T. Sapsford, S. Stokes, J. Jackson, N. “Simulation and Development Experience of a Stratified Charge Gasoline Direct Injection Engine,” SAE Technical Paper 962014 1996 10.4271/962014
- Yang, J. Anderson, R. “Fuel Injection Strategies to Increase Full-Load Torque Output of a Direct-Injection SI Engine,” SAE Technical Paper 980495 1998 10.4271/980495
- Roberts, M. “Benefits and Challenges of Variable Compression Ratio (VCR),” SAE Technical Paper 2003-01-0398 2003 10.4271/2003-01-0398
- Ke, Y. Pucher, H. “Controlling the Load and the Boost Pressure of a Turbocharged SI Engine by Means of Early Intake-Valve Closing,” SAE Technical Paper 960588 1996 10.4271/960588
- Livengood, J. C. Wu, P. C. “Correlation of Autoignition Phenomena in Internal Combustion Engines and Rapid Compression Machines” Fifth Symposium (International) on Combustion 347 356 1955
- Halstead, M.P. Kirsch, L.J. Quinn, C.P. “The autoignition of hydrocarbon fuels at high temperatures and pressures-Fitting of a mathematical model” Combustion and Flame 30 1977 45 60 10.1016/0010-2180(77)90050-5
- Curran, H. J. Gaffuri, P. Pitz, W. J. Westbrook, C. K. “A comprehensive modeling study of iso-octane oxidation” Combustion and Flame 129 3 May 2002 253 280 10.1016/S0010-2180(01)00373-X
- Zheng, J. Yang, W. Miller, D. Cernansky, N. “A Skeletal Chemical Kinetic Model for the HCCI Combustion Process,” SAE Technical Paper 2002-01-0423 2002 10.4271/2002-01-0423
- Tanaka, S. Ayala, F. Keck, J. C. “A reduced chemical kinetic model for HCCI combustion of primary reference fuels in a rapid compression machine” Combustion and Flame 133 4 June 2003 467 481 10.1016/S0010-2180(03)00057-9
- Jia, M. Xie, M. “A chemical kinetics model of iso-octane oxidation for HCCI engines” Fuel 85 17-18 December 2006 2593 2604 10.1016/j.fuel.2006.02.018
- Patel, A. Kong, S. Reitz, R. “Development and Validation of a Reduced Reaction Mechanism for HCCI Engine Simulations,” SAE Technical Paper 2004-01-0558 2004 10.4271/2004-01-0558
- Ogink, R. Golovitchev, V. “Reaction Mechanisms for Natural Gas and Gasoline in Homogeneous Charge Compression Ignition (HCCI) Engine Modeling” 6th Int. Conf. on Engines for Automobile, SAE Naples, ICE2003 Italy September 2003 http://www.tfd.chalmers.se/∼valeri/MECH.html
- Tomlin, A.S. Turányi, T. Pilling, M.J. “Mathematical tools for the construction, investigation and reduction of combustion mechanisms” Comprehensive Chemical Kinetics, Low-Temperature Combustion and Autoignition 35 1997 293 437 10.1016/S0069-8040(97)80019-2
- Wang, H. Frenklach, M. “Detailed reduction of reaction mechanisms for flame modeling” Combustion and Flame 87 3-4 December 1991 365 370 10.1016/0010-2180(91)90120-Z
- Ahmed, S.S Mauß, F. Moréac, G. Zeuch, T. “A comprehensive and compact n-heptane oxidation model derived using chemical lumping” Physical Chemistry Chemical Physics 2007 9 1107 1126 10.1039/B614712G
- Ranzi, E. Faravelli, T. Gaffuri, P. Sogaro, A. D'Anna, A. Ciajolo, A. “A wide-range modeling study of iso-octane oxidation” Combustion and Flame 108 1-2 January 1997 24 42 10.1016/S0010-2180(95)00274-X
- Ra, Y. Reitz, R.D. “A reduced chemical kinetic model for IC engine combustion simulations with primary reference fuels” Combustion and Flame 155 4 December 2008 713 738 10.1016/j.combustflame.2008.05.002
- He, X. Donovan, M.T. Zigler, B.T. Palmer, T.R. Walton, S.M. Wooldridge, M.S. Atreya, A. “An experimental and modeling study of iso-octane ignition delay times under homogeneous charge compression ignition conditions” Combustion and Flame 142 3 August 2005 266 275 10.1016/j.combustflame.2005.02.014
- Machrafi, H. Lombaert, K. Cavadias, S. Guibert, P. Amouroux, J. “Reduced chemical reaction mechanisms: experimental and HCCI modelling investigations of autoignition processes of iso-octane in internal combustion engines” Fuel 84 18 December 2005 2330 2340 10.1016/j.fuel.2005.01.001
- Hu, H. Keck, J. “Autoignition of Adiabatically Compressed Combustible Gas Mixtures,” SAE Technical Paper 872110 1987 10.4271/872110