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An Experimental Study of Fuel Composition and Combustion Chamber Deposit Effects on Emissions from a Spark Ignition Engine
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Abstract
Six chemically defined fuels have been run in a 2.0 liter production engine, in both a deposit-free and deposited state, at five different operating (speed/load) conditions. The fuel used to produce the deposits minimized the development of deposits in the intake system, so that primarily the effect of combustion chamber deposits were considered in this study. The six chemically defined fuels investigated were based on an iso-octane and toluene mix (base fuel). Methyl tertiary butyl ether, cyclohexane, diisobutylene, 1,2,4 trimethylbenzene and ethylbenzene were added to this base fuel to form five tertiary fuel mixtures. Engine-out emissions of speciated hydrocarbons, NOx, CO and CO2 were measured for the base fuel and five tertiary fuel mixtures in both the deposit-free and deposited state.
NOx emissions were seen to increase relative to the base fuel for the cyclohexane and ethylbenzene tertiary fuel mixtures. Nine major hydrocarbon emissions were found with engine runs on the base fuel, representing the partial oxidation products of iso-octane and toluene. The five tertiary fuel mixtures affected the distribution of the hydrocarbon emissions and in some case added new emissions. Most oxidation products were found to decrease with increasing load. Unburned fuel represented one-third to one-half of the hydrocarbon emissions.
After the development of combustion chamber deposits approximately a 30% increase in NOx emissions was observed. Also, unburned hydrocarbon emissions were found to increase approximately 25% with combustion chamber deposits. The extent to which combustion chamber deposits affected hydrocarbon emissions was found to be dependent on fuel structure. These findings indicate that the interaction of fuel structure with combustion chamber deposits should be considered in the development of reformulated gasolines if targeted emissions are to be maintained over the life of a vehicle.
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Harpster, M., Matas, S., Fry, J., and Litzinger, T., "An Experimental Study of Fuel Composition and Combustion Chamber Deposit Effects on Emissions from a Spark Ignition Engine," SAE Technical Paper 950740, 1995, https://doi.org/10.4271/950740.Also In
References
- Seinfeltmospheric J. H. Chemistry and Physics of Air Pollution John Wiley & Sons New York 1986
- Carter W. P. L. Development of Ozone Reactivity Scales for Volatile Organic Compounds Atmospheric Environment 1990
- Sawyer R. F. Reformulated Gasoline for Automotive Emissions Reduction Twenty-Fourth Symposium on Combustion 1992 1423
- Colucci J. M. Benson J. D. Impact of Reformulated Gasoline on Emissions from Current and Future Vehicles General Motors Research Laboratories 1991
- Lee B. Highlights of the Clean Air Act Amendments of 1990 J. Air Waste Manage. Assoc. 41 16 1991
- Bower Stanley L. Litzinger Thomas A. Frottier V. The Effect of Fuel Composition and Engine Deposits on Emissions from a Spark Ignition Engine SAE 1993
- Bower S. L. Litzinger T. A. Ritchey E. D. Fuel Composition Effects on Emissions from a Spark Ignition Engine 1992 1461
- Kaiser Edward W. et. al Effect of Fuel Structure on Emissions from a Spark-Ignited Engine 2. Naphthene and Aromatic Fuels Environmental Science & Technology 26 1581 1992
- Heywood J. B. Internal Combustion Engine Fundamentals Mcgraw-Hill New York 1988
- Obert E. F. Internal Combustion Engines and Air Pollution Harper & Row New York 1973
- Dempster Nicola M. Shore P. R. An Investigation into the Production of Hydrocarbon Emissions from a Gasoline Engine Tested on Chemically Defined Fuels SAE 1990
- Gatellier B. et. al. Hydrocarbon Emissions of SI Engines as Influenced by Absorption-Desorption in Oil Films SAE 1992
- Glassman I. Combustion Academic Press. Orlando 1987 2nd
- Dryer F.L. Brezinsky K. A flow Reactor Study of the Oxidation of n-Octane and Iso-Octane Combust. Sci. and Tech. 45 199 1986
- Litzinger T. A. The High Temperature Oxidation of Alkylated Aromatic Hydrocarbons Princeton University 1985
- Stanley J. Bower L. The Effects of Fuel Composition and Engine Deposits on the Emissions from a Spark Ignition Engine Pennsylvania State University 1993
- Kaiser Edward W. et. al Effect of Fuel Structure on Emissions from a Spark-Ignited Engine III. Olefinic Fuels Environmental Science & Technology 25 2005 1991
- Tsang W. Int. J. Chem. Kinet. 10 1119 1978
- Ninomiya J. S. Golovoy A. Effects of Air-Fuel Ratio on Composition of Hydrocarbon Exhaust from Isooctane Diisobutylene, Toluene, and Toluene-n-Heptane Mixture SAE 1969
- Siegel W. O. et. al. Speciated Hydrocarbon Emissions from Single Component Fuels 1. Effect of Fuel Structure Journal Air and Waste Management Assoc. 42 912 1992
- Studzinski W. M. et. al A Computational and Experimental Study of Combustion Chamber Deposit Effects on NO x Emissions SAE 1993