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The Effect of Fuel Characteristics on Combustion in a Spark-Ignited Direct-Injection Engine
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Abstract
An experimental study was conducted on a spark-ignited direct-injection engine burning fuels with different evaporation and autoignition characteristics. The test engine was a single-cylinder Direct-Injection Stratified-Charge (DISC) engine incorporating a combustion process similar to the Texaco Controlled Combustion System. Two fuels were tested and compared with a baseline gasoline fuel: diesel fuel, and gasoline mixed with an ignition improver. The tests were done at low to medium engine loads. Diesel fuel was found to have similar levels of hydrocarbon (HC) emissions as gasoline but had different characteristics. The optimum timing for diesel fuel was retarded from that for gasoline and combustion variability was much less with diesel than with gasoline. Gasoline with a commercial ignition improver normally used to increase the cetane number of diesel fuel was also tested. The effect of changing the autoignition quality of the fuel depended on the injector used. Two geometrically similar injectors that had substantially different emissions levels when run on pure gasoline were compared with gasoline mixed with ignition improver. The injector with the higher emissions was found to have a significant decrease in HC emissions when ignition improver was added to the gasoline. In conjunction with the drop in emissions, heat release analysis showed a secondary combustion burst retarded from the primary combustion event. From these experiments it was postulated that the spark-ignited direct-injection engines prefer volatile fuels with low octane (high cetane) ratings for optimal low load operation. However, with appropriate injection system controls, these engines will accept fuels with a range of characteristics.
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Frank, R. and Heywood, J., "The Effect of Fuel Characteristics on Combustion in a Spark-Ignited Direct-Injection Engine," SAE Technical Paper 902063, 1990, https://doi.org/10.4271/902063.Also In
References
- Duggal, V.K. Kuo, T.-W. Lux, F.B. “Review of Multi-fuel Engine Concepts and Numerical Modeling of In-Cylinder Flow Processes in Direct Injection Engines,” SAE paper 840005 , SAE Trans. 93 1984
- Enright, B. Borman, G.L. Myers, P.S. “A Critical Review of Spark Ignited Diesel Combustion,” SAE paper 881317 , SAE Trans. 97 1988
- Baranescu, G.S. “Some Characteristics of Spark-Assisted Direct-Injection Engine,” SAE paper 830589 1983
- Frank, R.M. “Sources of Unburned Hydrocarbon Emissions from a Direct-Injection Stratified-Charge Engine,” PhD Thesis Dept. of Mechanical Eng., M.I.T. 1989
- Alperstein, M. Schafer, G.H. Villforth, F.J. “Texaco's Stratified Charge Engine - Multifuel, Efficient, Clean, and Practical,” SAE paper 740563 1974
- Mitchell, E. Alperstein, M. Cobb, J.M. Faist, C.H. “A Stratified Charge Multifuel Military Engine - A Progress Report,” SAE paper 720051 1972
- Lewis, J.M. “UPS Multifuel Stratified Charge Engine Development Program - Field Test,” SAE paper 860067 1986
- Lewis, J.M. McBride, T.K. “UPS Multifuel Stratified Charge Engine Development - Progress Report,” SAE paper 831782 , SAE Trans. 92 1983
- Lewis, J.M. Tierney, W.T. “United Parcel Service Applies Texaco Stratified Charge Engine Technology to Power Parcel Delivery Vans - Progress Report,” SAE paper 801429 , SAE Trans. 89 1980
- Siewert, R.M. Groff, E.G. “Unassisted Cold Starts to -29°C and Steady State Tests of a Direct-Injection Stratified-Charge (DISC) Engine Operated on Neat Alcohols,” SAE paper 872066 , SAE Trans. 96 1987
- Kim, C. Foster, D.E. “Aldehyde and Unburned Fuel Emission Measurements from a Methanol-Fueled Texaco Stratified-Charge Engine,” SAE paper 852120 , SAE Trans. 94 1985
- Evers, L.W. Fleming, R.D. Hurn, R.W. “Efficiency and Emissions of a Stratified Charge Engine Optimized for Various Fuels,” SAE paper 780236 1978
- 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 paper 841359 , SAE Trans. 93 1984
- Chun, K. M. Heywood, J. B. “Estimating Heat-Release and Mass-of- Mixture Burned from Spark-Ignition Engine Pressure Data,” Combust. Sci. Technol. 54 133 144 1987
- Woschni, G. “A Universally Applicable Equation for the Instantaneous Heat Transfer Coefficient in the Internal Combustion Engine,” SAE paper 670931 , SAE Trans. 76 1967
- Sihling, K. Woschni, G. “Experimental Investigation of the Instantaneous Heat Transfer in the Cylinder of a High Speed Diesel Engine,” SAE paper 790833 , SP-449 1979
- Young, M. B. Lienesch, J. H. “An Engine Diagnostic Package (EDPAC) - Software for Analyzing Cylinder Pressure-Time Data,” SAE paper 780967 1978
- Rose, J.W. Cooper, J.R. “Technical Data on Fuel” British National Committee World Energy Conference 7th 1977
- Lefebvre, A.H. Gas Turbine Combustion Hemisphere Publishing Corporation NY 1983 335
- Arai, M. Tabata, M. Hiroyasu, H. Shimizu, M. “Disintegrating Process and Spray Characterization of Fuel Jet Injected by a Diesel Nozzle” SAE paper 840275 , SAE Trans. 93 1984
- Frank, R.M. Heywood, J.B. “Combustion Characterization in a Direct-Injection Stratified-Charge Engine and Implications on Hydrocarbon Emissions,” SAE paper 892058 , SAE Trans. 98 1989
- Frank, R.M. Heywood, J.B. “The Importance of Injection System Characteristics on Hydrocarbon Emissions from a Direct-Injection Stratified-Charge Engine,” SAE paper 900609 , SAE Trans. 99 1990
- Seko, T. Yoshida, Y. Yamaguchi, I. Sakai, T. Hori, M. Kim, Y.K. “Combustion Exhaust Emissions of the Spark-Assisted Methanol Diesel Engine,” SAE paper 861165 , SAE Trans. 95 1986
- LoRusso, J.A. Cikanek, H.A. “Direct Injection Ignition Assisted Alcohol Engine,” SAE paper 880495 , SAE Trans. 97 1988
- Lancaster, D.R. “Diagnostic Investigation of Hydrocarbon Emissions from a Direct-Injection Stratified-Charge Engine,” Stratified Charge Engines , I Mech E, C397/80 1980