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Diesel Combustion Improvements by the Use of Oxygenated Synthetic Fuels
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 01, 1997 by SAE International in United States
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In this paper results on in-cylinder pollutant concentration evolution during combustion of six different oxygenated fuels, in comparison with tetradecane and n-octane combustion, are presented. These four fuels are:
- Ethylene-Glygol-Dimethylether (monoglyme-C4H10O2),
- Diethylene-Glygol-Dimethylether (diglyme-C6H14O2),
- Diethylene-Glycol-Diethylether (diethyldiglycol-C8H18O3),
- butylether (C8H18O).
Two techniques were adopted on a single cylinder direct injection diesel engine: two-color pyrometry for the measurement of in-cylinder soot loading and a fast sampling valve for the measurements of in-cylinder combustion products. In addition, the sampling line downstream of the fast sampling valve was adapted for the in-cylinder aldehyde measurements.
The main results obtained provide information about the mechanisms that control soot evolution during diesel combustion. A large drop in the soot volume fraction and an increase in flame temperature were detected when oxygenated compounds were burnt. The reduction in the peak of the soot volume fraction is related to the oxygen content of the fuel. When fuels with the same number of carbon atoms are compared, the sharp increase of the fuel cetane number, unlike paraffinic fuels, does not produce an increase in soot formation.
In spite of the very high cetane number (about 100), the reduction of the pyrolysis phenomena also results from fast sampling valve measurements of intermediary pyrolysis products (acetylene, ethylene, etc.). Unlike the paraffinic fuels, the high flame temperature leads only to a moderate increase in NOx emissions.
Considering the molecular structure of these fuels, high aldehyde and carbonilic compound emissions are generally expected. However, the measurements of in-cylinder and exhaust aldehydes indicate that the reduction of the over-lean mixture zone, due to the high cetane number, combined with high combustion temperatures, lower the aldehyde emissions.
|Technical Paper||Improvement of Diesel Combustion and Emissions with Addition of Various Oxygenated Agents to Diesel Fuels|
|Technical Paper||Analysis of the Influence of Injection Timing on Diesel Combustion by the Two-Colour Method|
CitationBertoli, C., Del Giacomo, N., and Beatrice, C., "Diesel Combustion Improvements by the Use of Oxygenated Synthetic Fuels," SAE Technical Paper 972972, 1997, https://doi.org/10.4271/972972.
SAE 1997 Transactions - Journal of Fuels and Lubricants
Number: V106-4; Published: 1998-09-15
Number: V106-4; Published: 1998-09-15
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