COMPARISION OF MODEL CALCULATIONS AND EXPERIMENTAL RESULTS OF DIESEL ENGINE FUELLED WITH BIODIESEL

Abstract. This paper describes the results of the investigation the aim of which was to find out the impact of biodiesel and its blends on engine dynamical and economical parameters. A model for in-cylinder thermodynamics is implemented for easy simulation of internal combustion engine performance. The model is verified with the experimental data from an engine fuelled with biodiesel (RME). The experimental investigation was carried out on a direct injection diesel engine XD2P with industrial application located at the Engine Testing and Biofuels Laboratory. The tests were performed using regular diesel fuel (DD), 5 %, 20 %, 35 % and 100 % biodiesel blends (5RME, 20RME, 35RME, 100RME). Biodiesel used for blending meets the EN14214 standard. The present analysis reveals, via diagrams and formulas, how the main engine performance parameters can be affected by the testing conditions and biodiesel addition quantity. The results indicate that power for biodiesel and blends is lower than with ordinary diesel. The reduction in the torque and increase in fuel consumption are also observed. The matching between the experimental and predicted results is not higher than 3 %, with exception of some parameters at different engine speeds. Another situation is according to the fuel consumption, which is more affected by biodiesel addition, especially, when the addition exceeds 10 %