Spray and Combustion Characteristics of Reformulated Biodiesel with Mixing of Lower Boiling Point Fuel

Senda, Jiro; Ikeda, Tomoki; Haibara, Teruaki; Sakurai, Sho; Wada, Yoshimitsu; Fujimoto, Hajime

doi:10.4271/2007-01-0621

Cited by 8 publications

(7 citation statements)

References 15 publications

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“…Several studies performed under room temperature or low-density conditions (mostly non-evaporative) report a faster axial penetration of the liquid-phase portion of the biodiesel spray [11][12][13]. Other experiments have shown similar results under comparable or more realistic conditions of a diesel engine [14][15][16].…”

Section: Introductionsupporting

confidence: 63%

“…Several studies performed under room-temperature or low-density conditions (mostly non-evaporative) report a faster axial penetration of the liquid-phase portion of the biodiesel spray. 12–14 Other experiments have shown similar results under comparable or more realistic conditions of a diesel engine. 15–17 However, under these evaporative engine conditions, the vapour-phase penetration of the fuel jet needs to be considered, since this ultimately affects the fuel–ambient mixing rate.…”

Section: Introductionmentioning

confidence: 55%

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Fundamental spray and combustion measurements of soy methyl-ester biodiesel

Nerva

Genzale

Kook

et al. 2012

International Journal of Engine Research

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Nerva, J.; Genzale, CL.; Kook, S.; García Oliver, JM.; Pickett, LM. (2013) soy methyl-ester biodiesel is injected into a constant-volume combustion facility. A range of optical diagnostics is performed, comparing biodiesel to a conventional #2 diesel at the same injection and ambient conditions. Schlieren imaging shows virtually the same vapor-phase penetration for the two fuels, while simultaneous Mie-scatter imaging shows that the maximum liquid-phase penetration of biodiesel is higher than diesel due to their different boiling-point temperatures. But the different liquid-phase penetration does not affect overall mixing rate and downstream vapor-phase penetration because each fuel spray has similar momentum and spreading angle. The ignition delay and lift-off length are only slightly less for biodiesel compared to diesel, consistent with the CN. Because of the similarity in lift-off length, the differences in equivalence ratio distribution at the lift-off length are mainly affected by the fuels oxygen content. For biodiesel, the equivalence ratio is reduced, which, along with the fuel molecular structure and oxygen content, significantly affects soot formation downstream. Spatially-resolved soot volume fraction measurements obtained by combining laser extinction measurements with planar laser-induced incandescence imaging show that the soot concentration can be reduced by an order of magnitude for biodiesel. These integrated measurements of spray mixing, combustion, and quantitative soot concentration provide new validation data for the development of CFD spray, combustion, and soot formation models suitable for the latest biofuels. AbstractThough biodiesel has begun to penetrate the fuel market, its effect on injection processes, combustion, and emissions formation under diesel engine conditions remains somewhat unclear. Typical tailpipe measurements from engines running biodiesel indicate that PM, CO and UHC are decreased, whereas NO X emissions tend to be increased. However, these observations are the result of complex interactions between physical and chemical processes occurring in the combustion chamber, for which understanding is still needed.To characterize and decouple the physical and chemical influences of biodiesel on spray mixing, ignition, combustion and soot formation, a soy methyl-ester biodiesel is injected into a constant-volume combustion facility under diesel-like operating conditions. A range of optical diagnostics is performed, comparing biodiesel to a conventional #2 diesel at the same injection and ambient conditions.Schlieren high-speed imaging shows virtually the same vapor-phase penetration for the two fuels, while simultaneous Mie-scatter imaging shows that the maximum liquid-phase penetration of biodiesel is higher than diesel. Differences in the liquid-phase penetration are expected because of the different boiling-point temperatures of the two fuels. But the different liquid-phase penetration does not affect overall mixing rate and downstream vapor-phase penetration because each...

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Section: Introductionsupporting

confidence: 63%

Section: Introductionmentioning

confidence: 55%

Fundamental spray and combustion measurements of soy methyl-ester biodiesel

Nerva

Genzale

Kook

et al. 2012

International Journal of Engine Research

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“…The investigations on the combustion of B100 [8,11] and its atomization [14] have been carried out, yet the authors did not analyze the influence of the temperature of the fuel on the quality of its atomization. The authors [13] used pure B100 as the alternative fuel for combustion as well as mixtures of fuels.…”

Section: Przegląd Literaturymentioning

confidence: 99%

“…Podejmowano badania spalania B100 [8,11] oraz jego rozpylenia [14], jednak autorzy nie rozpatrywali wpływu temperatury paliwa na jakość rozpylenia. Autorzy [13] jako paliwa alternatywne do spalania wykorzystali czysty B100 oraz mieszaniny paliw.…”

Section: Spread Between the Fuel Spraysunclassified

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The qualitative spray analysis of liquid fuel in high-pressure piezoelectric injection system

Wisłocki¹,

Pielecha²,

Czajka³

et al. 2010

Combustion Engines

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The paper presents the methodology and tests results of the influence of the fuel injection pressure and combustion chamber back pressure on the changes of the fuel spray geometrical parameters injection uniformity and its quality during the injection. While evaluating the geometrical fuel spray parameters the spray penetration, speed of propagation were taken into account and while evaluating the quality of the fuel atomization the outflow of the fuel from the injector were considered. The tests reported here were performed for one value of the air back pressure at the various injection pressures. The fuel doses were changed by modifying the duration of the injection. A significant influence of theses parameters on the values of the operating indexes of the injection and atomization processes has been noted.

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