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In Cylinder Pressure Curve Simulation On Multifuel Engines - A Comparison Between A Polytrophic And General Thermodynamic Model For Gasoline, Ethanol And Natural Gas
ISSN: 0148-7191, e-ISSN: 2688-3627
Published November 28, 2007 by SAE International in United States
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Brazil is known for its long experience on using alternative fuels, mainly ethanol for light duty vehicles. In 2002, it was released the Flexible fuel car that can run with gasohol (gasoline with 22% of ethanol), hydrated ethanol or any blend of these fuels. By the end of 2006, national production of these vehicles represented around 80% of the total. Brazil is also the second world fleet of Natural Gas Vehicles (NGV), with more than 1,4 million light duty converted vehicles.
This paper describes the development of a computational thermodynamic model of compression, combustion and expansion processes of gasohol, ethanol and Natural Gas (NG) for the cylinder pressure curve prediction of a Flexible Fuel engine, working with a NG kit installed. The combustion process is modeled using a Wiebe function, which establishes the mass fraction of burned fuel. Convective heat transfer to cylinder walls is estimated with an empirical correlation for heat transfer coefficient determination. Equations for specific heat at constant pressure varying with temperature, not available on literature, were developed for each fuel for temperatures over 4000 K.
The model output generates the cylinder gas pressure profiles as functions of crank angle for two different approaches. One, solving the differential equation system assuming a polytrophic process after the intake valves closure and before the combustion start and the other by solving the whole system since the intake valve closure. A Flexible fuel engine, 1.8 liter with NG kit, operating with gasohol, hydrated ethanol and NG on different conditions of speed and load, was used to validate the simulations. Results show that the general model is much more precise than the polytrophic simplified approach.
Citationde Melo, T., Machado, G., Machado, R., Belchior, C. et al., "In Cylinder Pressure Curve Simulation On Multifuel Engines - A Comparison Between A Polytrophic And General Thermodynamic Model For Gasoline, Ethanol And Natural Gas," SAE Technical Paper 2007-01-2820, 2007, https://doi.org/10.4271/2007-01-2820.
- AMORIM, R.J. BAÊTA, J.G.C. VALLE, R.M. et al. 2005 “Experimental Analysis of Flexible Fuel Systems in Spark Ignition Engine” SAE 2005 Fuels & Lubricants Meeting & Exhibition , 2005-01-2183 Rio de Janeiro, RJ, Brazil May
- AMORIM, R.J. BAÊTA, J.G.C. VALLE, R.M. et al. 2005 “Analysis of an Otto cycle engine performance regarding alcohol concentration in gasoline and CNG usage” 18th International Congress of Mechanical Engineering Ouro Preto, MG, Brazil
- VICENTINI, P.C. KRONENBERGER, S. 2005 “Rating the performance of Brazilian flex fuel Vehicles” 2005 SAE Brazil Fuels & Lubricants Meeting & Exhibition, 2005-01-2206 Rio de Janeiro, Brazil May
- BAÊTA, J. G. C. 2006 Experimental Method for performance optimization of a multifuel engine keeping global efficiency Mechanics Department, UFMG Belo Horizonte, MG, Brazil
- LANZAFAME, R. MESSINA, M. 2001 “Fuels characterization for use in internal combustion engines” Fall Technical Conference - ASME , 2001-ICE-421 37-2 137 145
- LANZAFAME, R. MESSINA, M. 2002 “Experimental data extrapolation by using V order logarithmic” Spring Technical Conference of the ASME Internal Combustion Engine Division , 2002-ICE-458 38 147 153 Illinois, USA
- LANZAFAME, R. MESSINA, M. 2005 “New Gases Thermodynamic Properties Models to Predict Combustion Phenomena” SAE 2005 Fuels & Lubricants Meeting & Exhibition, 2005-01-2112 Rio de Janeiro, RJ, Brazil May
- LANZAFAME, R. MESSINA, M. 2003 “ICE gross heat release strongly influenced by specific heat ratio values” International Journal of Automotive Technology 4 3 125 133
- HEYWOOD, J. B. 1980 “Engine combustion modeling - an overview” Combustion Modeling in Reciprocating Engines Plenum Publishing Corporation 33 35 USA
- HEYWOOD, J. B. 1988 Internal Combustion Engine Fundamentals 1 New York, USA McGraw-Hill
- DA SILVA, L.L.C. 1992 Thermodynamic processes simulation on internal combustion engines Politécnica USP, Mechanics Department São Paulo, SP, Brasil
- MASSA, C.V.C. 1992 Theoretical Experimental model for combustion analysis on Otto type engine Mechanics Department, PUC Rio de Janeiro, RJ, Brasil
- CATON, J. A. 2000 “Comparisons of instructional and complete versions of thermodynamic engine cycle simulations for spark-ignition engines” International Journal of Mechanical Engineering Education 29 4 Mar. 284 306
- SHUDO, T. SUZUKI, H. 2002 “Applicability of heat transfer equations to hydrogen combustion” Society of Automotive Engineers of Japan 23 3 July 303 308
- SANTOS S. J. F.d. JUNIOR, 2004 Theoretical model for operational cycle prediction of a natural gas spark ignition engine COPPE/UFRJ Rio de Janeiro, RJ, Brasil
- JAMES, E. H. 1984 “Combustion modeling in spark ignition engines” Automotive Engineer 9 3 29 33
- RAMOS, J. A. 1989 Internal Combustion Engine Modeling 1st New York Hemisphere Publishing Corporation
- CHAN, S. H. ZHU, J. 2001 “Modeling of engine in-cylinder thermodynamics under high values of ignition retard” International Journal of Thermal Science 40 Jan. 94 103
- SOYLU, S. 2002 “Simple Modeling of Combustion for Natural Gas Engines” SAE 2002 Power train & Fluid Systems Conference & Exhibition, 2002-01-2733 San Diego, CA, USA October
- HEYWOOD, J. B. HIGGINS, J. M. TABACZYNSKI, R. J. 1979 “Development and use of a cycle simulation to predict SI engine efficiency and NOX emissions” SAE Technical Papers , 790291 1 26
- LINDSTRÖM, F. ANGSTRÖM, H. KALGHATGI, E. et al. 2005 “An empirical SI combustion model using laminar burning velocity correlations” SAE 2005 Fuels & Lubricants Meeting & Exhibition, 2005-01-2106 Rio de Janeiro, Brazil May
- ALLA, G. H. A. 2002 “Computer simulation of a four stroke spark ignition engine” Energy Conversion and Management 43 8 May 1043 1061
- SHUDO, T. NAKAJIMA, Y. FUTAKUCHI, T. 2000 “Thermal efficiency analysis in a hydrogen premixed combustion engine” Society of Automotive Engineers of Japan 21 2 April 177 182
- MELO, T. C. 2007 “Thermodynamic modeling of an Otto cycle flexible fuel type engine, working with gasoline, ethanol and natural gas” COPPE - UFRJ Rio de Janeiro, RJ, Brazil
- SHER, E. BAR-KOHANY, T. 2002 “Optimization of variable valve timing for maximizing performance of an unthrottled SI engine - a theoretical study” Energy 27 8 Aug 757 775
- KODAH, Z. H. SOLIMAN, H. S. ABU QUDAIS, M. et al. 2000 “Combustion in a spark-ignition engine” Applied Energy 66 3 Jul 237 250
- WOSCHNI, G. 1967 “A universally applicable equation for the instantaneous heat transfer coefficient in the internal combustion engine” SAE Technical Papers , 670931
- JANNAF 1963-1999 Thermodynamical tables Midland Dow Chemical Co.
- STULL, D.R. WESTRUM E.S. JR, SINKE, G.C. 1987 The chemical thermodynamics of organic compounds ROBERT E. KRIEGER publishing company Malabar, Florida, USA
- MOURA, C.A.D. PORTELA, L.S. 2003 “Comparação entre três equações usadas para representar a capacidade térmica molar do gás ideal (Passut-Danner, Yuan-Mok e Aly-lee)” Boletim Técnico da PETROBRAS 46 3 4 220 237 Brasil
- MELO, T.C.C. KRONENBERGER, S. 2005 “Evaluation of the Amazon forest low methane Natural Gas for vehicular applications” SAE 2005 Fuels & Lubricants Meeting & Exhibition, 2005-01-2161 Rio de Janeiro, Brasil May
- KLEEMAN, A. P. MENEGAZZI, P. HENRIOT, S. et al. 2003 “Numerical Study on knock for an SI engine by thermally coupling combustion chamber and cooling circuit simulation” SAE 2003 World Congress & Exhibition, 2003-01-0563 Detroit, MI, USA March
- STONE, R. 1999 Introduction to Internal Combustion Engines 3rd Warrendale, PA, USA Society of Automobile Engineers
- ABNT, NBR IS01585 1996 Veículos rodoviários - código de ensaio de motores - potência líquida efetiva Associação Brasileira de Normas Técnicas Rio de Janeiro, Brasil
- MELO, T.C.C. DIAS, A.L.F. 2004 “Experimental Methods for Reducing Uncertainty of Measurement on Vehicle Emission Testing” SAE 2004 Fuels & Lubricants Meeting & Exhibition, 2004-01-1961 Toulouse, France June
- BARROS, J.E.M. 2003 Internal Combustion Engines Study applying object oriented language Mechanical Engineer, UFMG Belo Horizonte, MG, Brazil
- BOHBOT, J. LAFOSSAS, F. A. ALBRECHT, P. et al. 2004 “A new coupling approach using a 1D system simulation software and a 3D combustion code applied to transient engine operation” SAE 2004 Powertrain & Fluid Systems Conference & Exhibition , 2004-01-3002 Tampa, FL, USA October
- GANESAN, V. 1996 Internal Combustion Engines 2nd New York, USA McGraw-Hill