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Journal Article

Transient Emissions Characteristics of a Turbocharged Engine Fuelled by Biodiesel Blends

2013-04-08
2013-01-1302
The effects of different biodiesel blends on engine-out emissions under various transient conditions were investigated in this study using fast response diagnostic equipment. The experimental work was conducted on a modern 3.0 L, V6 high pressure common rail diesel engine fuelled with mineral diesel (B0) and three different blends of rapeseed methyl esters (RME) (B30, B60, B100 by volume) without any modifications of engine parameters. DMS500, Fast FID and Fast CLD were used to measure particulate matter (PM), total hydrocarbon (THC) and nitrogen monoxide (NO) respectively. The tests were conducted during a 12 seconds period with two tests in which load and speed were changed simultaneously and one test with only load changing. The results show that as biodiesel blend ratio increased, total particle number (PN) and THC were decreased whereas NO was increased for all the three transient conditions.
Technical Paper

In-Cylinder Optical Study on Combustion of DMF and DMF Fuel Blends

2012-04-16
2012-01-1235
The bio-fuel, 2,5 - dimethylfuran (DMF) is currently regarded as a potential alternative fuel to gasoline due to the development of new production technology. However, little is known about the flame behavior in an optical engine. In this paper, high speed imaging (with intensifier) was used during the combustion of DMF and its blends with gasoline and ethanol (D50, D85, E50D50 and E85D15) in an SI optical engine. The flame images from the combustion of each fuel were analyzed at two engine loads: 3bar and 4bar IMEP. For DMF, D50 and E50D50, two modes were compared: DI and PFI. The average flame shapes (in 2D) and the average flame speeds were calculated and combined with mass fraction burned (MFB) data. The results show that when using DMF, the rate of flame growth development and flame speed is higher than when using gasoline. The differences in flame speed between DMF and gasoline is about 10% to 14% at low IMEP.
Technical Paper

Instantaneous PLII and OH* chemiluminescence study on wide distillation fuels, PODEn and ethanol blends in a constant volume vessel

2020-04-14
2020-01-0340
Wide distillation fuels (WD), whose volatility and cetane numbers are between gasoline and diesel, have been widely studied for premixed compression ignition (CI). While PODEs are ideal diesel alternative fuels due to their good volatility and high oxygen content, but the over high cetane numbers (>70) limit their use in premixed CI modes. In this paper, a PODE3-6 mixture (PODEn), ethanol and WD were mixed to adjust the characteristics of the fuels for emission control and combustion optimization. The newly designed fuels (WD-EP) were studied by OH* chemiluminescence in a constant volume vessel. Instantaneous PLII was also applied to reveal the soot distribution and evolution process. The Abel transformation was adopted to calculate the total soot of axisymmetric flame. The results show that when WD is blended with 20% PODEn-ethanol mixture fuel(70% PODEn and 30% ethanol by volume), the ignition delay and flame lift-off length are similar to WD.
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