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A Study of Natural Gas in an Air-Cooled Spark Ignition Engine
Published October 27, 1997 by Society of Automotive Engineers of Japan in Japan
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An experimental study was conducted to determine potential of natural gas in lowering exhaust emissions from small spark ignition engines. A single cylinder, four-stroke, air-cooled spark ignition engine was used in the study. The investigation showed that increasing engine compression ratio from 8:1 to 10:1 reduced penalty in power normally associated with natural gas engine. The engine was able to run very stable at equivalence ratio as lean as 0.65 while the same engine could not be run at equivalence ratio below 0.85 on gasoline. Best thermal efficiency and reduced emissions of hydrocarbons and oxides of nitrogen were realized around equivalence ratio 0.75. Reducing equivalence ratio further lowered emissions of oxides of nitrogen significantly while increase in hydrocarbons was small. Most of the hydrocarbons in exhaust were of the methane type which have low ozone forming reactivity.
CitationAsar, G., Varde, K., Sabry, T., and Sileem, A., "A Study of Natural Gas in an Air-Cooled Spark Ignition Engine," SAE Technical Paper 978488, 1997.
- U.S. Environmental Protection Agency Control of Air Pollution; Emission Standards for New Non Road Spark-Ignition Engines at or below 19 kW 40 CFR June 1995
- Burrahm , R. W. , White , J. J. , and Carroll , J. N. Small Utility Engine Emissions Reductions Using Automotive Technology SAE Paper 911805 1991
- Crabtree , D. , Xia , Z. , and Varde , K. S. An Investigation of Emission Control in Small Spark Ignition Engine SAE Paper 952079 1995
- Simons , G. R. , and Kittelson , D. B. Reducing Utility Engine Exhaust Emissions with a Thermal Rectors Proceedings Small Engine Technology Conference 45 56 Society of Automotive Engineers, Inc 1995
- Mikulic , L. , and Lenz H. P. Catalytic Exhaust Treatment for Small Two Stroke Spark Ignition Engines SAE Paper 845083 1984
- Wu , C. Y. Y. , Peng , Y. , and Gau , T. Emission Control of Four-Stroke Motorcycle Engine Proceedings Small Engine Technology Conference 29 38 Society of Automotive Engineers, Inc. 1995
- Castangna , F. , Favennec , J. , Mabilon , G. , and Pringent , M. The Catalytic Treatment of Small Two-Stroke Gasoline Engine Exhaust Proceedings of SETC 2 569 577 Italy 1993
- Monnier , G. , Duret , P. , and Glover , S. IAPAC- Compressed Air-Assisted Fuel Injection for High Efficiency, Low Emissions Marine Outboard Two-Stroke Engines JSAE Paper 911251, SETC Conference Japan 1991
- Jones , A. L. , and Evans , R. L. Comparison of Burning Rates in a Natural Gas Fueled Spark Ignition Engine Transactions of the ASME (Journal of Power) 107 908 913 1985
- Al-Himyary , T. J. , and Karim , G. A. A Correlation for the Burning Velocity of Methane-Air Mixtures at High Pressures and Temperatures Transactions of the ASME (Journal of Power) 109 439 442 1987
- Varde , K.S. , Patro , N. , and Drouillard , K. Exhaust Emissions from a Lean-Burn Natural Gas Fueled SI Engine SAE Paper 952222 1995
- Weaver , C. S. Natural Gas Vehicles - A Review of the Satte of the Art SAE Paper 892133 1989
- Hassaneen , A. , Varde , K. S. , Bawady , A. H. , and Abdul Aziz A. Z. M. Air-To-Fiel ratio Control and its effects in a Lean-Burn Natural Gas Engine Proceedings of ASME, ICE-Vol 26-1 53 61 1996