JSME International Journal Series B Fluids and Thermal Engineering
Online ISSN : 1347-5371
Print ISSN : 1340-8054
ISSN-L : 1340-8054
Application of a Combustion Model to a Diesel Engine Fueled with Vegetable Oils
Rosca RADURakosi EDWARDIulian-Agape COMSAGaiginschi RADU
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2001 Volume 44 Issue 4 Pages 634-640


The paper presents the application of a three component model to the theoretical study of the combustion process of a Diesel engine fueled with sunflower oil and sunflower oil-Diesel fuel mixtures. The model assumes that the working fluid consists of three components: the fresh air, the flame and the burned gases.
The combustion model uses the energy conservation equation:
vc·Qc·dξα=dUα+dLα+dQ, [1]
where vc is the fuel cyclic dose, Qc is the fuel heating value, ξα=v/vc, v is the quantity of burned fuel up to the moment α, Uα is the internal energy of the working fluid, Q is the heat exchanged through the cylinder walls and Lα is the mechanical work.
The heat release law was assumed to be a Vibe type one:
ξα=Rc·[1−exp(−6.9·AmPp+1)]+(1−Rc)·[1−exp(−6.9·Amd+1)], [2]
·Ap=(α−αd)/(αP−αd) and A=(α−αd)/(αF−αd);
·αd-start of combustion angle;
·αf-end of combustion angle;
·αP-end of rapid combustion angle.
Using Eqs. [1] and [2] we have obtained the cylinder pressure during combustion, for the vegetable fuels taken into account; the peak values were confirmed during the experiments.

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© 2001 by The Japan Society of Mechanical Engineers
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