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Exhaust Hydrocarbon Emissions from Gasoline Engines - Surface Phenomena
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Abstract
A detailed understanding of the surface phenomena associated with exhaust hydrocarbon (HC) emissions is required to be certain that all avenues of emission control, internal to the combustion chamber, have been exploited. This paper presents information obtained on a single-cylinder research engine, which supports the following hypotheses: there exists a critical piston top land-to-bore clearance above which HC emissions decrease sharply; the presence of an oxidatively active catalytic surface in the combustion chamber increases HC emissions; using a clean engine operating on a fuel containing 5% lubricating oil, HC emissions increase within minutes to a level comparable to that obtained with equilibrium deposits; the first parcel of gas to leave the exhaust valve contains an order of magnitude lower concentration of HCs than does the total mixed exhaust; and a cylinder bore tapered outward towards the top eliminates oil-droplet formation in a motored engine.
In order to predict exhaust HC emissions from the top land volume, an equation is derived which accounts for the effects of piston and bore expansion, blowby, and cylinder-pressure ratio. This equation is applied to literature data obtained on the decrease of HC emissions with an increase in engine speed.
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Haskell, W. and Legate, C., "Exhaust Hydrocarbon Emissions from Gasoline Engines - Surface Phenomena," SAE Technical Paper 720255, 1972, https://doi.org/10.4271/720255.Also In
References
- Egerton A. “Sir Humphry Davy and the Royal Institution.” Seventh Symposium (International) on Combustion London Buterworth 1959 xxxvii
- Belles F. E. Swett C. C. “Ignition and Flammability of Hydrocarbon Fuels.” Basic Considerations in the Combustion of Hydrocarbon Fuels with Air, NACA Report 1300 1959 83
- Daniel W. A. “Flame Quenching at the Walls of an Internal Combustion Engine.” Sixth Symposium (International) on Combustion New York Reinhold Publishing Corp. 1957 886
- Daniel W. A. Wentworth J. T. “Exhaust Gas Hydrocarbons-Genesis and Exodus.” SAE Technical Progress Series 6 “Vehicle Emissions, Part 1.” New York Society of Automotive Engineers, Inc. 1964
- Beckman E. W. Fagley W. S. Sarto J. O. “Exhaust Emission Control by Chrysler-The Cleaner Air Package.” SAE Transactions 75 1967 660107
- Bruderrick H. Schneider W. Halasy I. “Quantitative Gas Chromatographic Analysis of Hydrocarbons with Capillary Columns and Flame Ionization Detectors.” Anal Chem 36 1964 461
- Bennett P. A. Murphy C. K. Jackson M. W. Randall R. A. “Reduction of Air Pollution by Control of Emission from Automotive Crankcases.” SAE Transactions 68 1960 514
- Wentworth J. T. “Piston and Ring Variables Affect Exhaust Hydrocarbon Emissions.” SAE Transactions 77 1968 680109
- Daniel W. A. “Engine Variable Effects on Exhaust Hydrocarbon Composition.” SAE Transactions 76 1967 670124
- Wentworth J. T. “Effect of Combustion Chamber Surface Temperature on Exhaust Hydrocarbon Concentration.” 710587 SAE Mid-Year Meeting Montreal June 1971
- LeFeuvre T. “Instantaneous Metal Temperatures and Heat Fluxes in a Diesel Engine.” University of Wisconsin, Mechanical Engineering Department 1968 SAE Transactions 78 1969
- Walker J. W. “Piston Temperature Measurements in a Watercooled Two-Stroke Cycle Spark Ignition Engine.” University of Wisconsin, Mechanical Engineering Department 1966
- Gross-Gromonski L. “Piston Temperature in Compression Ignition Engines.” SAE Transactions 76
- Robison J. A. Wentworth J. T. “Piston and Ring Variables Affect Exhaust Hydrocarbon Emissions.” SAE Transactions 77 1968 680109
- Taylor C. Rogowski A. “Scavenging the Two-Stroke Engine.” SAE Transactions 62 1954 486
- Mayer W. J. Krauss D. P. Moore C. P. Murphy C. B. “Oil-Consumption Measurements of Individual Cylinders in Automotive Engines.” 700055 SAE Automotive Engineering Congress Detroit 1970
- Hamilton W. Kammon K. R. Cambron R. B. Ott L. E. “Two Ring Piston Development.” SAE Transactions 78 1969