Analytical study for atomization of biodiesels and their blends in a typical injector: Surface tension and viscosity effects

Ejim, Chidirim; Fleck, Brian A.; Amirfazli, A.

doi:10.1016/j.fuel.2006.11.006

Cited by 301 publications

(150 citation statements)

References 13 publications

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“…Diesel and biodiesel fuels have several different properties which can decrease engine performance and increase emissions. For example, the high viscosity and surface tension of biodiesel affect atomisation by increasing the mean droplet size, which in turn increases spray tip penetration [6][7][8][9][10][11][12][13]. Considering the differences between diesel and biodiesel fuels, the optimum parameter of diesel engines may not seem suitable for biodiesel.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Injection Timing on the Performance of a Diesel Engine Using Diesel-Biodiesel Blends

Rostami¹,

Ghobadian²,

Kiani³

2014

Int. J. Automot. Mech. Eng.

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In this study, the effect of fuel injection timing on the performance of a diesel engine was investigated experimentally and analytically using diesel-biodiesel blends. Different experiments were carried out on the diesel engine at engine speeds of 1200, 1600, 2000 and 2400 rpm. The injection timing was regulated for 10, 15 and 20 degree crank angle before top dead centre. The experimental results of engine torque, brakespecific fuel consumption (BSFC), cylinder pressure, and exhaust gas temperature for fuel blends of B20, B40, and B100 at different engine speeds and injection timings were recorded. The results showed that advancing the fuel injection timing for fuel blends of B20, B40, and B100 increased engine torque by approximately 2.1%, 2.9% and 6.3%, respectively, and decreased maximum BSFC by approximately 2.7%, 3.3% and 6.6%, respectively. Then, an artificial neural network (ANN) was used to predict engine performance. The injection timing, engine speed, and fuel blends were used as input parameters whereas engine performance parameters such as engine torque, BSFC, peak cylinder pressure, and exhaust gas temperature were used as the output parameters. The results showed that an ANN is a good tool to predict engine performance.

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Section: Introductionmentioning

confidence: 99%

Effect of the Injection Timing on the Performance of a Diesel Engine Using Diesel-Biodiesel Blends

Rostami¹,

Ghobadian²,

Kiani³

2014

Int. J. Automot. Mech. Eng.

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“…Sauter Mean Diameter (SMD) is de ned as the diameter of a sphere that has the same volume/surface area ratio as the entire spray. The SMD correlation has been presented by Ejim et al [40] …”

Section: Resultsmentioning

confidence: 99%

Probing into the Effects of Fuel Injection Pressure and Nozzle Hole Diameter on Spray Characteristics under Ultra-high Injection Pressures Using Advanced Breakup Model

2016

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Abstract. In this article, non-evaporating and non-reacting diesel spray is modeled under ultra-high injection pressure using an Eulerian-Lagrangian scheme. This is accomplished in order to probe into the e ects of injection pressure, nozzle diameter, and ambient density on spray characteristics. An advanced hybrid breakup model that takes into consideration the transient processes during spray injection has been added to the open source code, OpenFOAM. Reynolds-Average Navier-Stokes (RANS) equations are solved using the standard k " turbulence model and the fuel droplet is tracked by a Lagrangian scheme. Published experimental data have been used for validation of spray characteristics at 15 kg/m 3 ambient density and injection pressures of 100, 200 and 300 MPa. Also, three nozzle diameters of 0.08, 0.12 and 0.16 mm have been implemented for investigating the e ect of this parameter on spray formation. Computed spray shape, jet penetration, spray volume, equivalent ratio along the injector axis and Sauter Mean Diameter (SMD) illustrate good agreement with experimental data of a single hole nozzle and symmetric spray. The e ects of fuel injection pressure, nozzle hole diameter and ambient density on main spray parameters are presented. It is concluded that the numerical model presented here is quite suitable for accurately predicting diesel spray shapes under ultra-high injection pressures.

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“…This leads to poor atomization losses inherent to fuel burning. EJIM et al (2007) explain that binary mixtures with higher proportions of biodiesel can still provide adequate atomization characteristics of mixture formation in a diesel engine. Combining this factor to increases cetane number values of the mixtures containing higher biodiesel levels, there may be improvements in fuel burning in the combustion chamber.…”

Section: Resultsmentioning

confidence: 99%

“…EJIM et al (2007) argue that binary mixtures with higher proportions of diesel oil can still provide adequate atomization characteristics of the mixture formation in a diesel engine. In turn, CASTELLANELLI et al (2008) report that in studies using different blends of soybean ethyl biodiesel in a direct injection engine, the B2, B5 and B10 biodiesel blends showed similar performance to diesel.…”

Section: Introductionmentioning

confidence: 99%

Perfomance evaluation of a direct injection engine using different blends of soybean (Glycine max) methyl biodiesel

et al. 2011

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Diesel fuel is used widely in Brazil and worldwide. On the other hand, the growing environmental awareness leads to a greater demand for renewable energy resources. Thus, this study aimed to evaluate the use of different blends of soybean (Glycine max) methyl biodiesel and diesel in an ignition compression engine with direct injection fuel. The tests were performed on an electric eddy current dynamometer, using the blends B10, B50 and B100, with 10; 50 e 100% of biodiesel, respectively, in comparison to the commercial diesel B5, with 5% of biodiesel added to the fossil diesel. The engine performance was analyzed trough the tractor power take off (PTO) for each fuel, and the best results obtained for the power and the specific fuel consumption, respectively, were: B5 ( ). The best performance occurred with the use of B5 and B10 fuel, without significant differences between these blends. The B100 fuel showed significant differences compared to the other fuels.KEYWORDS: dynamometer, power, specific consumption. AVALIAÇÃO DO DESEMPENHO DE UM MOTOR DE INJEÇÃO DIRETA SOB DIFERENTES MISTURAS DE BIODIESEL METÍLICO DE SOJA (Glycine max)RESUMO: O óleo diesel combustível é utilizado em grande escala no País e no mundo. Por outro lado, a crescente conscientização ambiental acarreta em maior demanda por recursos energéticos renováveis. Assim, o presente trabalho objetivou avaliar o uso de diferentes misturas de biodiesel metílico de soja (Glycine max) e diesel mineral em um motor de ignição por compressão e injeção direta de combustível. Os procedimentos de ensaio foram realizados em um dinamômetro elétrico de correntes parasitas, utilizando as proporções de mistura B10, B50 e B100, com 10; 50 e 100% de biodiesel, respectivamente, em comparação ao diesel comercial B5, com 5% de biodiesel adicionado ao diesel fóssil. O desempenho do motor foi analisado através da tomada de potência do trator (TDP) para cada mistura, sendo que os melhores resultados obtidos para potência e consumo específico de combustível, respectivamente, foram: B5 (44,62 kW; 234,87

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Analytical study for atomization of biodiesels and their blends in a typical injector: Surface tension and viscosity effects

Cited by 301 publications

References 13 publications

Effect of the Injection Timing on the Performance of a Diesel Engine Using Diesel-Biodiesel Blends

Effect of the Injection Timing on the Performance of a Diesel Engine Using Diesel-Biodiesel Blends

Probing into the Effects of Fuel Injection Pressure and Nozzle Hole Diameter on Spray Characteristics under Ultra-high Injection Pressures Using Advanced Breakup Model

Perfomance evaluation of a direct injection engine using different blends of soybean (Glycine max) methyl biodiesel

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