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Analysis of Combustion Parameters and Their Relation to Operating Variables and Exhaust Emissions in an Upgraded Multivalve Bi-Fuel CNG SI Engine
Technical Paper
2004-01-0983
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The combustion propagation and burned-gas expansion processes in a bi-fuel CNG SI engine were characterized by applying a newly developed diagnostic tool, in order to better understand how these processes are related to the fuel composition, to the engine operating variables as well as to the exhaust emissions. The diagnostic tool is based on an original multizone heat-release model that is coupled with a CADmodel of the burned-gas containing surface for the computation of the burning speed and the burned-gas mean expansion velocity. Furthermore, the thermal and prompt NO sub-models, embedded in the diagnostic code, were employed to study the effects ofNO formation mechanisms and thermodynamic parameters on nitric oxide emissions.
A previously developed multivalve bi-fuel SI engine has been upgraded to take a wide experimental database of in-cylinder pressure time-histories, engine performance and pollutant emissions throughout an extended air-fuel ratio interval for both fuels, i.e., gasoline and CNG (up to the lean-combustion stability limit) and an enlarged speed range for CNG (up to 6500 rpm). In particular, the CNG pressure reducer upstream of the injection system was replaced to deliver the gaseous fuel at higher pressures and the CNG injectors were replaced with new injectors purposely designed and realized with larger flow nozzle areas. Experimental tests have thus been carried out in a broad interval of speeds (n = 2000-5500 rpm), loads (bmep = 200-790 kPa), relative air-fuel ratios (RAFR = 0.80-1.60) and spark advances (SA ranging from 8 deg retard to 8 deg advance with respect to MBT timing).
One of the main findings was that the ratio between the burning speed Sb and the laminar flame speed SL, at the point of the engine cycle where Sb peaks, scales with n. The scale factors were worked out for both gasoline and CNGoperations. The effects of operating engine variables on flame propagation parameters were analyzed.
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Catania, A., Misul, D., Spessa, E., and Vassallo, A., "Analysis of Combustion Parameters and Their Relation to Operating Variables and Exhaust Emissions in an Upgraded Multivalve Bi-Fuel CNG SI Engine," SAE Technical Paper 2004-01-0983, 2004, https://doi.org/10.4271/2004-01-0983.Also In
New Spark Ignition Engine and Component Design, and Spark Ignition Combustion
Number: SP-1828; Published: 2004-03-08
Number: SP-1828; Published: 2004-03-08
References
- Zhang, F.R. Okamoto, K. Morimoto, S. Shoji, F. “Methods of increasing the BMEP (Power Output) for Natural Gas Spark Ignition Engines,” SAE SP - 1371 ‘Combustion Processes in Engines Utilizing Gaseous Fuels’ 11 19 1998
- Kato, K. Igarashi, K. Masuda, M. Otsubo, K. Yasuda, A. Takeda, K. Sato, T. “Development of Engine for Natural Gas Vehicle,” SAE SP - 1436 ‘Combustion in SI Engines’ 52 60 1999
- Catania, A.E. Misul, D. Spessa, E. Martorana G. “Conversion of a Multivalve Gasoline Engine to Run on CNG,” SAE 2000 Transactions, Journal of Engines 109 809 817 2001
- Catania, A.E. d'Ambrosio, S. Mittica, A. Spessa, E. “Experimental Investigation of Fuel Consumption and Exhaust Emissions of a 16V Pent-Roof Engine Fuelled by Gasoline and CNG,” SAE 2001 Transactions, Journal of Engines 110 1213 1233 2002
- Soylu, S. “Combustion Analysis of a Natural Gas Engine” ASME Paper No. ICES2003-563, ASME-ICED 2003 Spring Technical Conference May 11-14 Salzburg, Austria 2003
- Kopecek, H. Charareh, S. Lackner, M. Forsich, C. Winter, F. Klausner, J. Herdin, G. Wintner, E. “Laser Ignition of Methane-Air Mixture at High Pressure and Diagnostics,” ASME Paper No. ICES2003-614, ASME-ICED 2003 Spring Technical Conference May 11-14 Salzburg, Austria 2003
- Gupta, S.B. Sekar, R.R. Xu, Z. Leong, K.H. Reed, C.B. “Laser Based Ignition of Natural Gas-Air Mixtures,” ASME Paper No. ICES2003-656, ASME-ICED 2003 Spring Technical Conference May 11-14 Salzburg, Austria 2003
- d'Ambrosio, S. Spessa, E. Vassallo, A. “Methods for Specific Emissions Evaluation in SI Engines Based on Calculation Procedures of Air-Fuel Ratio: Development, Assessment and Critical Comparison,” ASME Paper No. ICES2003-626, ASME-ICED Spring Technical Conference May 11-14 Salzburg, Austria 2003
- Catania, A.E. Misul, D. Mittica, A. Spessa, E. “A Refined Two-Zone Heat Release Model for Combustion Analysis in SI Engines,” JSME International Journal, Series B 46 1 75 85 2003
- Catania, A.E. Misul, D. Mittica, A. Spessa, E. “Unsteady Convection Model for Heat Release Analysis of IC Engine Pressure Data,” SAE 2000 Transactions, Journal of Engines 109 1610 1620 2001
- Catania A. Misul D. Spessa E. Vassallo A. “A Diagnostic Tool for the Analysis of Heat-Release, Flame Propagation Parameters and Nitric Oxide Formation in SI Engines,” COMODIA 2004 August 2-5 Yokohama, Japan 2004
- Spicher, U. Bäcker, H. “Correlation of Flame Propagation and In-Cylinder Pressure in a Spark Ignited Engine,” SAE Paper No. 902126 1990
- Hu, Z. Whitelaw, J.H. Vafidis, C. “Flame Propagation Studies in a Four-Valve Pentroof-Chamber Spark Ignition Engine,” SAE Paper No. 922321 1992
- Heywood, J.B. “Internal Combustion Engine Fundamentals,” McGraw-Hill International Editions 1988
- Fenimore, C.P. “The Formation of Nitric Oxide in Premixed Hydrocarbon Flames,” Thirteen Symposium (Int'l) on Combustion The Combustion Institute Pittsburgh 1971
- Lavoie, G.A. Blumberg, P.N. “Measurements of NO Emissions From a Stratified Charge Engine: Comparison of Theory and Experiment,” Combustion Science and Technology 8 25 37 1973
- Lavoie, G.A. Heywood, J.B. Keck, J.C. “Experimental and Theoretical Study of Nitric Oxide Formation in Internal Combustion Engines,” Combustion Science and Technology 1 313 326 1970
- Korematsu, J.T.K. “Study on Oxidation Processes of Unburnt HC in Exhaust System of Spark Ignition Engines,” SAE Paper No. 931985 1985
- Guezennec, Y.G. Hamada, W. “Two-Zone Heat Release Analysis of Combustion Data and Calibration of Heat Transfer Correlation in an I.C. Engine,” SAE Paper No. 1999-01-0218 1999
- Gatowski, J.A. Balles, E.N. Chun, K.M. Nelson, F.E. Ekchian, J.A. Heywood, J.B. “Heat Release Analysis of Engine Pressure Data,” SAE Trans., Journal of Engines 93 961 977 1984
- Chun, K.M. Heywood, J.B. “Estimating Heat-Release and Mass-of-Mixture Burned from Spark-Ignition Engine Pressure Data,” Combustion Science and Technology 54 133 143 1987
- Metghalchi, M. Keck, J.C. “Burning Velocities of Mixtures of Air with Methanol, Isooctane and Indolene at High Pressure and Temperature,” Combustion and Flame 48 191 210 1982
- D'Errico, G. Misul, D. Onorati, A. Spessa, E. “Integrated Fluid Dynamic Modeling and Combustion Diagnostics of a Multivalve SI Engine under Gasoline and CNG Operations,” SAE_NA 2003-01-18 6 th International Conference ‘ICE2003’ Sept. 14 19 2003
- Iljima, T. Takeno, T. “Effects of Temperature and Pressure on Burning Velocity,” Combustion and Flame 65 1986
- Miller, R. Davis, G. Lavoie, G. Newman, C. Gardner, T. “A Super-Extended Zel'dovich Mechanism for NOx Modeling and Engine Calibration,” SAE Paper No. 980781 1998
- Rublewski, M. Heywood, J.B. “Modeling NO Formation in Spark Ignition Engines with a Layered Adiabatic Core and Combustion Inefficiency Routine,” SAE Paper No. 2001-01-1011 2001