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Investigation into Crevice Out-Gassing of an Operating SI Engine with a Fast-FID
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 01, 1993 by SAE International in United States
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The action of crevices in an operating SI engine has been studied with a fast-FID. A single-cylinder Ricardo E6 research engine was fuelled with propane and operated at 1300 RPM. FID measurements in the exhaust port have shown that advancing the ignition timing from 30°BTDC (MBT) to 60°BTDC raises the HC concentration by 25% during the first 120°CA of the exhaust stroke and by 20% for the remainder of the stroke. A static “artificial” crevice of known volume, mounted inside the engine cylinder was used to study the differing HC outgassing characteristics at the two ignition timings. When sampling in-cylinder at the mouth of this crevice, the opposite effect of a 50% reduction in outgas HC concentration occurred when the ignition was advanced to 60°BTDC. It is argued that advancing the ignition causes earlier enflamement of the static crevice and induces burned as well as unburned gas to enter the crevice thereby diluting the HCs from this source. In contrast to this, it has been shown that displacement of the piston down the cylinder bore causes later enflamement of the top-land with advanced ignition and results in higher HC concentrations in the exhaust.
CitationPeckham, M. and Collings, N., "Investigation into Crevice Out-Gassing of an Operating SI Engine with a Fast-FID," SAE Technical Paper 932642, 1993, https://doi.org/10.4271/932642.
- Gatellier, B. Trapy, J. Herrier, D. Quelin, J.M. Galliot, F. 1992 “Hydrocarbon Emissions of SI Engines as Influenced by Fuel Absorption-Desorption in Oil Films.” SAE 920095
- Wentworth, J.T. 1972 “More on Origins of Exhaust Hydrocarbons-Effects of Zero Oil Consumption, Deposit Location, Surface Roughness.” SAE Trans. 720939
- Yamamoto, H. Horita, S. Matsuoka, T. 1992 “Surrounding Combustion Process (SCP)-New Concept for Lean Burn Engines.” SAE 920058
- Daniel, W.A. 1957 “Flame Quenching at the Walls of an Internal Combustion Engine.” Sixth Symposium (International) on Combustion
- Wentworth, J.T. 1968 “Piston and Ring Variables Affect Exhaust Hydrocarbon Emissions.” SAE 680109
- Wentworth, J.T. 1971 “The piston crevice volume effect on exhaust hydrocarbon emissions.” Combustion Science and Technology 4 97
- Reitz, R.D. Kuo, T. 1989 “Modeling of HC Emissions Due to Crevice Flows in Premixed-Charge Engines.” SAE 892085
- Kaiser, E.W. Rothschild, W.G. Lavoie, G.A. 1983 “Storage and Partial Oxidation of Unburned Hydrocarbons in Spark-ignited Engines-Effect of Compression Ratio and Spark Timing.” Combustion Science and Technology 36 171 189
- Peckham, M. Collings, N. 1992 “Study of Engine Wall Layer Hydrocarbons with a Fast-Response FID.” SAE 922237
- Finlay, I.C. Boam, D.J. Bingham, J.F. Clark, T.A. 1990 “Fast Response FID Measurement of Unburned Hydrocarbons in the Exhaust Port of a Firing Gasoline Engine.” SAE 902165
- Heywood, J.B. 1988 “Internal Combustion Engine Fundamentals.” McGraw-Hill
- Namazian, M. Heywood, J.B. 1982 “Flow in the Piston-Cylinder-Ring Crevices of a Spark-ignition Engine: Effect on Hydrocarbon Emissions, Efficiency and Power.” SAE 820088
- Weiss, P. Keck, J.C. 1981 “Fast Sampling Valve Measurements of Hydrocarbons in the Cylinder of a CFR Engine.” SAE 810149