Biodiesel combustion in an optical HSDI diesel engine under low load premixed combustion conditions

Fang, Tiegang; Lin, Yuan-Chung; Foong, Tien Mun; Lee, Chia-fon

doi:10.1016/j.fuel.2009.02.033

Cited by 82 publications

(42 citation statements)

References 45 publications

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“…Recent studies performed under high-temperature, but non-reactive, unsteady conditions showed that biodiesel can increases LL by up to 20% [5,6] or 100% [7] with respect to conventional diesel fuels. This behavior has been related to its higher density and lower volatility [7,8].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…PCCI evolved from the HCCI combustion model for the sake of better control over the start of combustion [43,116]. It can overcome problems in the HCCI model such as combustion noise and uncontrolled combustion phases.…”

Section: Premixed Charged Compression Ignition (Pcci)mentioning

confidence: 99%

Recent development of biodiesel combustion strategies and modelling for compression ignition engines

Azad

Rasul

Khan

et al. 2016

Renewable and Sustainable Energy Reviews

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“…The spray penetration and SMD were higher, while dispersion and cone angle were smaller for biodiesel, consistent with experimental trends reported in other literatures. 10,11 In terms of combustion, Fang et al 12 studied soybean biodiesel combustion in an optical high-speed direct-injection diesel engine. The direct combustion imaging showed that the ignition delay was extended with increasing biodiesel content due to the higher boiling point and poor air-fuel mixture formation.…”

Section: Introductionmentioning

confidence: 99%

Spray and combustion of waste cooking oil biodiesel in a compression-ignition engine

Hwang

Jung

Bae

2015

International Journal of Engine Research

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An experimental study was carried out to compare the spray and combustion characteristics of waste cooking oil biodiesel with those of conventional diesel in a common-rail direct-injection compression-ignition engine. The indicated mean effective pressure of approximately 0.7 MPa was tested under an engine speed of 800 r/min. The fuels were injected at an injection timing of 25 crank angle degree after top dead center with injection pressures of 80 and 160 MPa. The experiments were performed to investigate the combustion and emission characteristics in a metal engine, while spray and combustion flame characteristics in an optical engine. The morphological and compositional features of particulate matter were also analyzed by using transmission electron microscopy and thermogravimetric analysis. The direct imaging of the spray indicated a longer injection delay for waste cooking oil biodiesel. However, it exhibited longer liquid penetration length and narrower spray angle than diesel as the spray developed. Waste cooking oil biodiesel combustion showed a longer ignition delay with a slightly lower peak of in-cylinder pressure and heat release rate than diesel due to the deteriorated atomization and evaporation of fuel spray. In terms of emission, waste cooking oil biodiesel showed benefits in reduction of carbon monoxide, unburned hydrocarbon and particulate matter emissions. The particulate matter from waste cooking oil biodiesel was composed of smaller primary particles and more volatile organic fraction than diesel soot. The combustion flame imaging verified the retarded combustion phase of waste cooking oil biodiesel. Waste cooking oil biodiesel combustion showed lower flame luminosity accompanied by shorter visible flame duration, at both injection pressures. The flame spatial fluctuation and flame nonhomogeneity were also lower for waste cooking oil biodiesel.

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Biodiesel combustion in an optical HSDI diesel engine under low load premixed combustion conditions

Cited by 82 publications

References 45 publications

Fundamental spray and combustion measurements of soy methyl-ester biodiesel

Fundamental spray and combustion measurements of soy methyl-ester biodiesel

Recent development of biodiesel combustion strategies and modelling for compression ignition engines

Spray and combustion of waste cooking oil biodiesel in a compression-ignition engine

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