This content is not included in your SAE MOBILUS subscription, or you are not logged in.
The Effect of Mixing Rate, End of Injection, and Sac Volume on Hydrocarbon Emissions from a D.I. Diesel Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 12, 1983 by SAE International in United States
Annotation ability available
Some results of a systematic analysis of important sources of hydrocarbon emissions from a direct injection diesel engine are presented. The following sources are considered and investigated: (1) local over-mixing, (2) poor end of injection, (3) fuel emptying from sac volume.
The analysis uses systematic engine experiments and an existing two-dimensional thick evaporating spray model to determine the contribution of various hydrocarbon sources to the total hydrocarbon emissions in the exhaust.
The results show that at idle and light load conditions, local overmixing is the major source of hydrocarbon emissions. The amount of fuel over-mixed is directly controlled by mixing rate, ignition delay, and the lean limit of combustion. Mixing rate calculations show that the injection rate shape and nozzle geometry are more important than the physical properties of the fuel in determining the amount of fuel overmixed.
The results also show that for a low emission engine using timing advance at light loads for overmixing control, poor end of injection and fuel emptying from the sac volume can be important sources of hydrocarbons. The characterization of these sources and their effect on fuel evaporation and hydrocarbon emissions are discussed.
|Technical Paper||Strategies for Meeting Future Harmonised Emissions Standards if Sport Utility Vehicles with Direct Injection Diesel Engines|
|Technical Paper||Meeting the US 2007 Heavy-Duty Diesel Emission Standards - Designing for the Customer|
CitationYu, R., Kuo, T., Shahed, S., and Chang, T., "The Effect of Mixing Rate, End of Injection, and Sac Volume on Hydrocarbon Emissions from a D.I. Diesel Engine," SAE Technical Paper 831294, 1983, https://doi.org/10.4271/831294.
- Reitz R. D. Bracco F. V. “On the dependence of spray angle and other spray parameters on nozzle design and operating conditions,” SAE paper 790494 1979
- Kuo T.-W. “On the scaling of transient laminar, turbulent, and spray jets,” Department of Mechanical and Aerospace Engineering, Princeton University Ph.D. Thesis March 1982
- Yu R. C. Wong V. W. Shahed S. M. “Sources of hydrocarbon emissions from direct injection diesel engines,” SAE paper 80048
- Greeves G. Khan I. M. Wang C. T. H. Fenne I. “Origins of hydrocarbon emissions from diesel engines.” SAE paper 770259
- Burman P. G. DeLuca F. “Fuel injection system and control for internal combustion engines,” Simmons Boardman Publishing Co. New York 1962
- Rosselli A. Badgley P. “Simulation of the Cummins diesel injection system,” SAE paper 710570
- Ford H. S. Merrion D. F. Hames R. J. “Reducing hydrocarbons and odour in diesel exhaust by fuel injector design,” SAE paper 700734