Effect of biodiesel unsaturated fatty acid on combustion characteristics of a DI compression ignition engine

Puhan, Sukumar; Saravanan, N.; Nagarajan, G.; Vedaraman, N.

doi:10.1016/j.biombioe.2010.02.017

Cited by 156 publications

(54 citation statements)

References 15 publications

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“…This could be explained as combustion is always enhanced by high air/fuel (A/F) mixture, good atomization, and spray characteristics [23]. Unsaturated oils enhance mixing, due to their loose bonds between the molecules [36]. Table 5 [37] displays the free fatty acid contents of the three tested VOs, and it can be seen that RapO contains the highest percentage of unsaturated fatty acids.…”

Section: Power and Torquementioning

confidence: 99%

Performance and Emissions of Sunflower, Rapeseed, and Cottonseed Oils as Fuels in an Agricultural Tractor Engine

Balafoutis

Fountas

Natsis

et al. 2011

ISRN Renewable Energy

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A comparative experimental investigation was conducted to evaluate the performance and exhaust emissions of an agricultural tractor engine when fueled with sunflower oil, rapeseed oil, and cottonseed oil and their blends with diesel fuel (20/80, 40/60 and 70/30 volumetrically). Tests were also carried out with diesel fuel to be used as a reference point. Engine power, torque, BSFC, thermal efficiency, NO x and CO 2 were recorded for each tested fuel. All vegetable oils resulted in normal operation without problems during the short-term experiments. The 20/80 blends showed unstable results, in comparison to higher oil content fuels. Power, Torque and BSFC were higher as oil content was increased in the fuel. Rapeseed oil fuels showed increased power, torque and thermal efficiency with simultaneous lower BSFC in comparison to the other two vegetable oils. Cottonseed oil fuels gave better engine performance than sunflower oil fuels. In all oil types, NO x emissions were augmented when fuel oil percentage was increased. Cottonseed oil fuels led to higher NO x emission increase compared to rapeseed oil fuels. CO 2 emissions showed a tendency to be increased as the oil content was evolved. The highest CO 2 emissions were given by cottonseed oil fuels, followed by rapeseed and sunflower oil.

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Section: Power and Torquementioning

confidence: 99%

Performance and Emissions of Sunflower, Rapeseed, and Cottonseed Oils as Fuels in an Agricultural Tractor Engine

Balafoutis

Fountas

Natsis

et al. 2011

ISRN Renewable Energy

View full text Add to dashboard Cite

show abstract

“…In other words, because their enthalpy of vaporization is higher than that of fuels with a branched molecular structure, they have low bulk modulus, low ignition delay, lower fuel injection during premixing, and lower NO x emissions. 10 According to reports in the literature, [34][35][36][37] NO x emissions increase in response to increasing flame front and combustion chamber temperatures. Under severe operating conditions with high engine load, the temperature of the flame front and the combustion chamber directly affect the combustion process, altering the NO x emissions.…”

Section: Resultsmentioning

confidence: 99%

Biodiesel Glycerides from the Soybean Ethylic Route Incomplete Conversion on the Diesel Engines Combustion Process

Cataluña

Shah

Pelisson

et al. 2017

J. Braz. Chem. Soc.

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An evaluation was made to determine the effect of the glycerides presence resulting from the incomplete conversion of soybean biodiesel produced via alkaline catalysis and ethylic route on engine performance, and emissions in formulations containing 10 and 20% (m/m) of biodiesel used as additives in base diesel with low sulfur content and cetane ratings of 45 and 50. By way of comparison, similar formulations were used with soybean biodiesel methyl route with low concentration of glycerides. Tests on a diesel cycle engine with a mechanical fuel injection system indicated that the presence of glycerides decreases the volatility of biodiesel and increase the cetane number of fuels. The higher the cetane number, the higher the particulate matter emissions and the lower the unburned hydrocarbon emissions. Formulations with cetane number 50 showed higher emissions of particulate matter. The presence of glycerides in biodiesel reduces the fuel's vapor pressure, thereby increasing the cetane number and emissions of particulate matter and lower emissions of unburned hydrocarbons. The specific consumption of fuels formulated with biodiesel increases due to its lower enthalpy of combustion and to the presence of glycerides in fuels formulated with soybean biodiesel produced via the ethanol route.

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“…It increases the intermolecular forces between fuel molecules, strengthening the weak intermolecular forces between hydrocarbon chains in diesel fuel [26]. Lower viscosity of CME biodiesel blends is related to the fuel carbon size and chain length of fatty acid, as explained in [27,28]. A long chain fatty acid leads to a bigger carbon size and also longer carbon chains (14 and above), which will increase fuel viscosity.…”

Section: Fuel Propertiesmentioning

confidence: 99%

Combustion and Emission Characteristics of Coconut-Based Biodiesel in a Liquid Fuel Burner

et al. 2017

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This paper presents an investigation on the combustion performance of different Coconut Methyl Ester (CME) biodiesel blends with Conventional Diesel Fuel (CDF) under B5 (5% CME, 95% CDF), B15 (15% CME, 85% CDF), and B25 (25% CME, 75% CDF) conditions. The performances of these fuels were evaluated based on the temperature profiles of the combustor wall and emission concentration of Oxides of Nitrogen (NO x ), Sulphur Dioxide (SO 2 ), and Carbon Monoxide (CO). The fuel properties of the CME biodiesel blends were measured and compared with CDF. All tested fuels were combusted using an open-ended combustion chamber at three different equivalence ratios, i.e., lean fuel to air mixture (Φ = 0.8), stoichiometry (Φ = 1.0), and rich fuel to air mixture (Φ =1.2), using a standard solid spray fuel nozzle. The results indicated that CME biodiesel blends combust at a lower temperature and produce less emission in comparison with CDF for all equivalence ratios. Moreover, the increase of CME content in biodiesel blends reduced the temperature of the combustor wall and the emission concentration. Results also proved that the utilization of biodiesel is beneficial to various industrial applications, especially in the transportation sector due to it being environmentally friendly, and serves as an alternative to petroleum diesel fuel.

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Effect of biodiesel unsaturated fatty acid on combustion characteristics of a DI compression ignition engine

Cited by 156 publications

References 15 publications

Performance and Emissions of Sunflower, Rapeseed, and Cottonseed Oils as Fuels in an Agricultural Tractor Engine

Performance and Emissions of Sunflower, Rapeseed, and Cottonseed Oils as Fuels in an Agricultural Tractor Engine

Biodiesel Glycerides from the Soybean Ethylic Route Incomplete Conversion on the Diesel Engines Combustion Process

Combustion and Emission Characteristics of Coconut-Based Biodiesel in a Liquid Fuel Burner

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