Effects of Cetane Number, Aromatic Content and 90% Distillation Temperature on HCCI Combustion of Diesel Fuels National Research Council Canada

Format:

Conference/Event

Author/Creator:

Hosseini, Hosseini, author.

Contributor:

Chippior, Wallace

Dumitrescu, Cosmin Emil

Fairbridge, Craig

Guo, Hongsheng

Mitchell, Ken

Neill, W.

Conference Name:

SAE 2010 Powertrains Fuels & Lubricants Meeting (2010-10-25 : San Diego, California, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2010

Summary:

The effects of cetane number, aromatics content and 90%distillation temperature (T90) on HCCI combustion were investigatedusing a fuel matrix designed by the Fuels for Advanced CombustionEngines (FACE) Working Group of the Coordinating Research Council(CRC). The experiments were conducted in a single-cylinder,variable compression ratio, Cooperative Fuel Research (CFR) engine.The fuels were atomized and partially vaporized in the intakemanifold. The engine was operated at a relative air/fuel ratio of1.2, 60% exhaust gas recirculation (EGR) and 900 rpm. Thecompression ratio was varied over the range of 9:1 to 15:1 tooptimize the combustion phasing for each fuel, keeping otheroperating parameters constant.The results show that cetane number and T90 distillationtemperature significantly affected the combustion phasing. Cetanenumber was clearly found to have the strongest effect. An increasein cetane number or a decrease in the T90 distillation temperatureadvanced the combustion phasing. The cetane number effect isrelated to increased low temperature heat release (LTHR) withincreasing cetane number. The T90 effect is primarily due to achange in the physical delay period associated with preparation ofthe fuel-air mixture. At a similar combustion phasing, the high CNfuels exhibited significantly longer combustion duration than thelow CN fuels. The best fuel conversion efficiencies were generallyachieved with the four low cetane number fuels (FACE No. 1-4) asoptimized combustion phasing occurred at a higher compressionratio. However, the two fuels with high CN and low T90 (FACE No. 5and 7) also produced high fuel conversion efficiencies, although ata slightly lower compression ratio. These two fuels (FACE No. 5 and7) produced the lowest indicated specific HC (isHC) emissions. Thisis due to the combined effects of high fuel volatility andreactivity that resulted in a more efficient combustion process.FACE No. 8, which has high CN and high T90, produced notably higherisHC emissions when the combustion phasing was in the range of 0°to 10°CA, aTDC. FACE No. 6 and 8, which have high CN and high T90,produced higher isCO emissions when the combustion phasing wasretarded. The isNOx emissions were extremely low (below0.008 g/kWh) for all fuels. Aromatic content did not directlyaffect the combustion phasing or emissions behavior

Notes:

Vendor supplied data

Publisher Number:

2010-01-2168

Access Restriction:

Restricted for use by site license