This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Study of Engine Wall Layer Hydrocarbons with a Fast-Response FID
Annotation ability available
Sector:
Language:
English
Abstract
A fast-response FID has been used to study the concentration of hydrocarbon material at four different locations in a firing SI engine. These were: on the flat surface of the cylinder head, at the exhaust valve seat crevice, just downstream of the exhaust seat in the exhaust port and 20mm downstream from the valve stem in the exhaust manifold. A close-fitting sleeve arrangement enabled the sample tube to be positioned accurately flush with the head face and also to be slid away from the wall into the bulk gases whilst maintaining a gas-tight seal. In this way, wall effects could be noted by moving the probe position without stopping the engine and directly comparing with hydrocarbon levels in the bulk gas. Using propane in a fully-warmed up engine, results showed the presence of HCs residing in a 2mm layer adjacent to the wall after EVO and during the exhaust stroke. These could be detected flowing over the valve seat after EVO and were also observed at the manifold location. This indicated that quench and crevice HCs may be transported by engine gas dynamics within a layer adjacent to the head surface into the vicinity of the sampling points avoiding extensive oxidation in the bulk cylinder gases.
Recommended Content
Authors
Topic
Citation
Peckham, M. and Collings, N., "Study of Engine Wall Layer Hydrocarbons with a Fast-Response FID," SAE Technical Paper 922237, 1992, https://doi.org/10.4271/922237.Also In
References
- Daniel, W.A. “Flame Quenching at the Walls of an Internal Combustion Engine.” 6th Symp. Comb. 1957 886 894
- LoRusso, J.A. Kaiser, E.W. Lavoie, G.A. “In-Cylinder Measurements of Wall Layer Hydrocarbons in a Spark-Ignited Engine.” Comb. Sci. and Tech. 1983 33 75 112
- Haskell, W.W. Legate, C.E. SAE 720255
- Kaiser, E.W. LoRusso, J.A. Lavoie, G.A. Adamczyk, A.A. “The Effect of Oil Layers on the Hydrocarbon Emissions from Spark-Ignited Engines.” Comb. Sci. and Tech. 1982 28 69 73
- Collings, N. Willey, J. “Cyclically Resolved HC Emissions from a Spark Ignition Engine.” SAE 871691
- Sleightholme, G.R. “In-Cylinder Measurements of Charge Inhomogeneity in a Spark-ignited Engine.” SAE 900484
- Finlay, I.C. Boam, D.J. Bingham, J.F. Clark, T.A. “Fast Response FID Measurement of Unburned Hydrocarbons in the Exhaust Port of a Firing Gasoline Engine.” SAE 902165
- Namazian, M. Heywood, J.B. SAE 820088
- Lyford-Pike, E.J. Heywood, J.B. “Thermal Boundry Layer Thickness in the Cylinder of a Spark-Ignition Engine.” Int. Journal of Heat and Mass Transfer 1984 27 10 1873 1878