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An investigation of droplet mean diameters and fuel consumption for straight vegetable oil

Kolodnytska R., Ilchenko A.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

2006

z. 68 [231]

95-102

Alternatives to the use of diesel in compression ignition engine are straight vegetable oil (SVO) and biodiesel. SVO is suitable as a fuel for diesel engine in case of: (1) relatively high temperature of SVO; (2) SVO and diesel blends; (3) a two tank system where vehicle is started up and shut down on a diesel and then switched over to a second tank on SVO. There are problems such as poor atomisation and coking tendencies due to significantly higher viscosity of SVO in comparison with diesel fuel. It is important to study the spray parameters during SVO injection. The new formula for the Sauter Mean Diameters (SMD) for rapeseed oil, biodiesel and diesel fuel blends was proposed. It is predicted that the SMD is expected to be proportional to Eggers length parameter [.....] for realistic fuel values of dynamic viscosity µ, surface tension δ and density ρ. Experimental studies of rapeseed oil and diesel blends were conducted on truck GAZ-33060 without any engine modification. The fuel consumption (in term of litre per kilometre) increased with the increase in proportion of rapeseed oil in the blend that has good agreement with theoretical model.

An evaluation of models for biodiesel injection sprays

Kolodnytska R.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

2004

z. 62 [209]

185--193

There is a tendency to use biodiesel (methyl ester of rapeseed oil in particular), rapeseed oil and their blends with diesel as an alternative fuel for diesel engines. The mathematical modelling of the fuel spray is a wide-spread approach lo facilitate the problem solving in this area. The paper studies three types of the models, namely Sazhin's model, Reitz's wave breakup model, and Lishevsky's model. For the models, the relationship between respective model parameters has been defined and the parameter's values have been calculated using experimental data. Given the values, some main spray characteristics have been computed. Based on the characteristics' values, an evaluation of the models has been performed and the following conclusions have been made: (1) the models discussed do not enable to compute all characteristics needed all together; (2) some models do not indicate the increase of the spray penetration for rapeseed oil and biodiesel in comparison with diesel; (3) in case of biodiesel, it seems promising to develop a hybrid model based on the wave breakup model and using empirical formulae of Lishevsky's model. For rapeseed oil, the possibility to employ the models discussed should be studied further and will probably require more experimental data.