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Combustion Process Investigation in a Small SI Engine using Optical Diagnostics
Technical Paper
2010-01-2262
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Nowadays an elevated number of two, three and four wheels vehicles circulating in the world-wide urban areas is equipped with Port Fuel Injection Spark Ignition (PFI SI) engines. Their technological level is high, but a further optimization is still possible, especially at low engine speed and high load. To this purpose, the scientific community is now focused on deepening the understanding of thermo fluid dynamic phenomena that takes place in this kind of engine: the final purpose is to find key points for the reduction in engine specific fuel consumption and exhaust emissions without a decrease in performance.
In this work, the combustion process was investigated in an optically accessible single cylinder PFI SI engine. It was equipped with the head, injection device and exhaust line of a commercial small engine for two-wheel vehicles, it had the same geometrical characteristics in terms of bore, stroke and compression ratio. The combustion chamber was optically accessible through a quartz ring under the engine head and a sapphire window on the piston top. Cycle-resolved visualization was carried out to follow the flame propagation from the spark ignition until the late combustion phase. The visualization was performed from the bottom of the engine and from the lateral side with different camera inclinations. High spatial resolution visualization of the combustion process was carried out. Moreover two color pyrometry method was applied to evaluate the spatial distribution of diffusion flames temperature and soot concentration in the combustion chamber. UV-visible emission spectroscopy was used to identify the chemical species that feature the combustion process and to study the pollutants formation. The cyclic variability and the fuel deposits formation on the combustion chamber surfaces were also investigated. All the measurements carried out in the combustion chamber were correlated with the main engine parameters and exhaust emissions. The effect of the fuel injection phasing was tested. Two fuel injection strategies were considered: in the first one, the fuel injection started when the intake valves were open; in the second one the fuel injection occurred at closed intake valves.
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Tornatore, C., Merola, S., and Sementa, P., "Combustion Process Investigation in a Small SI Engine using Optical Diagnostics," SAE Technical Paper 2010-01-2262, 2010, https://doi.org/10.4271/2010-01-2262.Also In
References
- Drake, M.C. Haworth, D.C. 2007 Advanced gasoline engine development using optical diagnostics and numerical modeling Proceedings of the Combustion Institute 31 99 124
- Zhao, H. Ladommatos, N. 1998 Prog. Energy Combust. Sci. 24 221 255
- Hottel, H.C. Broughton, F.P. 1932 Ind. Eng. Chem. Anal. Ed. 4 166 174
- Costanzo, V.S. Heywood, J.B. “Mixture Preparation Mechanisms in a Port Fuel Injected Engine,” SAE Technical Paper 2005-01-2080 2005 10.4271/2005-01-2080
- Behnia, M. Milton, B.E. 2001 Fundamentals of fuel film formation and motion in SI engine induction systems Energy Conversion and Management 42 15-17 1751 1768
- Milton, B.E. Behnia, M. Ellerman, D.M. 2001 Fuel deposition and re-atomisation from fuel/air flows through engine inlet valves Int. Journal of Heat and Fluid Flow 22 3 350 357
- Gold, M.R. Arcoumanis, C. Whitelaw, J.H. Gaade, J. Wallace, S. 2000 Mixture Preparation Strategies in an Optical Four-Valve Port-Injected Gasoline Engine Int. J. of Engine Research 1 1 41 56
- Nogi, T. Ohyama, Y. Yamauchi, T. Kuroiwa, H. “Mixture Formation of Fuel Injection Systems in Gasoline Engines,” SAE Technical Paper 880558 1988 10.4271/880558
- Meyer, R. Heywood, J.B. “Liquid Fuel Transport Mechanisms into the Cylinder of a Firing Port-Injected SI Engine During Start Up,” SAE Technical Paper 970865 1997 10.4271/970865
- Zervas, E. 2004 Correlations between cycle-to-cycle variations and combustion parameters of a spark ignition engine Applied Thermal Engineering 24 14-15 2073 2081
- Bianco, Y. Cheng, W. Heywood, J. “The Effects of Initial Flame Kernel conditions on Flame Development in SI Engines,” SAE Technical Paper 912402 1991 10.4271/912402
- Witze, P. Hall, M. Bennet, M. “Cycle-resolved Measurements of Flame Kernel Growth and Motion Correlated with Combustion Duration,” SAE Technical Paper 900023 10.4271/900023
- Laux, C.O. Spence, T.G. Kruger, C.H. Zare, R.N. 2003 Optical diagnostics of atmospheric pressure air plasmas Plasma Sources Sci. Technol. 12 125 138
- Griem, H.R. 1964 Plasma Spectroscopy McGraw-Hill New York
- Kubota, Y. Ichiki, R. Hara, T. Yamaguchi, N. Takemura, Y. 2009 Spectroscopic Analysis Of Nitrogen Atmospheric Plasma Jet J. Plasma Fusion Res. SERIES 8 740 743
- Gaydon, A.G. Wolfhard, H.G. 1953 Mechanism of formation of CH, C2, OH and HCO radicals in flames Symposium (International) on Combustion 4 1 211 218
- Dieke, G.H. Crosswhite, H.M. 1962 The ultraviolet bands of OH J. Quant. Spectrosc. Radiat.Transfer 2 97 199
- Alkemade, C.Th.J. Herrmann, R. 1979 Fundamentals of Analytical Flame Spectroscopy Hilger Bristol, UK
- Levin, D.A. Laux, C.O. Kruger, CH. 1999 A general model for the spectral radiation calculation of OH in the ultraviolet J. Quant. Spectrosc. Radiat. Transfer. 61 377 392
- Zizak, G. Flame Emission Spectroscopy: Fundamentals and Applications Lecture given at the ICS Training Course on Laser Diagnostics of Combustion Processes NILES, University of Cairo Egypt 2000
- Higgins, B. McQuay, M.Q. Lacas, F. Candel, S. 2001 An experimental study on the effect of pressure and strain rate on CH chemiluminescence of premixed fuel-lean methane/air flames Fuel 80 11 1583 1591
- Higgins, B. McQuay, M.Q. Lacas, F. Rolon, J.C. Darabiha, N. Candel, S. 2001 Systematic measurements of OH chemiluminescence for fuel-lean, high-pressure, premixed, laminar flames Fuel 80 1 67 74
- Baulch, D.L. Cobos, C.J. Cox, R.A. Esser, C. Frank, P. Just, Th. Kerr, J.A. Pilling, M.J. Troe, J. Walker, R.W. Warnatz, J. 1992 Evaluated Kinetic Data for Combustion Modelling J. Phys. Chem. Ref. Data. 21 3 411 734
- Smith, W.H. 1969 Transition Probabilities for the Swan and Mulliken C2 Bands Astrophys. J. 156 791 794
- Goyette, A.N. Lawler, J.E. Anderson, L.W. Gruen, D.M. McCauley, T.G. Zhou, D. Krauss, A.R. C 2 Swan band emission intensity as a function of C 2 density Plasma Sources Sci. Technol. 7 2 149 157 1998
- Gaydon, A.G. 1940 The flame spectrum of carbon monoxide Proceedings of the Royal Society of London 176 967 505 521
- Dixon, R.N. 1963 The carbon monoxide flame bands Proceedings of the Royal Society of London 275 1362 431 446