Browse Publications Technical Papers 2000-01-2038
2000-06-19

Modeling of Hydrocarbons Formation and Emission in Gas Engines 2000-01-2038

As standards for hydrocarbon emissions from vehicles become more stringent due to environmental concerns, considerable effort has been devoted to investigate the mechanisms of formation, transport, and oxidation of unburned hydrocarbons in spark ignition engines.
In order to understand controlling factors in the processes, a transient one-dimensional reactive-diffusive model has been formulated for simulating the oxidation process taking place in the reactive layer between hot burned gases and cold unreacted air-fuel mixture, and for estimating exhaust hydrocarbon emission levels from natural gas spark ignition engines.
The main innovation shown by the model is the consideration also of the expansion of crevice gas in the axial direction. The model takes into consideration the contribution of the top land piston-ring crevice phenomenon, this being the main unburned hydrocarbon source in natural gas engines.
A comparison of the simulation results with experimental emission measurements shows an underprediction of the calculated remaining hydrocarbons in cylinder, probably because of the one-step kinetic mechanism employed for the oxidation of methane.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Preview Document Add to Cart
Members save up to 16% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

LNG-Fuelled Engines and Fuel Systems for Medium-Speed Engines in Maritime Applications

2011-01-1998

View Details

TECHNICAL PAPER

Natural Gas and Biogas Use in Transit Bus Fleets - A Technical, Operational and Environmental Approach

2014-36-0194

View Details

TECHNICAL PAPER

Investigations on Combustion Process of Low-pressure CNG Compound Direct Injection Spark-ignited Engines

2010-32-0052

View Details

X