Experimental and numerical evaluation of combustion analysis of a DI diesel engine

In this study investigated both experimentally and numerically in detail the combustion characteristics of a diesel engine operating with biodiesel fuel produced from fig seed oil at full load and different speeds. The biodiesel was subsequently blended with diesel fuel in different blend ratios of 5%, 10% and 20% by volume of biodiesel. AVL Fire software was used in numerical study. The results showed that it was confirmed that the numerical model is consistent. Heat release rate, p-V diagram, charge change process, mass fraction burned, cyclic differences, burning duration, turbulence velocity distribution and mixture formation were evaluated. Experimental results showed that when biodiesel fuel blends were used, the in-cylinder pressure and heat release rate increased. In addition, the pumping loss was slightly improved. Maximum heat release rates of diesel, 5%, 10% and 20% biodiesel blended are 30.17 J/°, 32.2 J/°, 35.25 J/°and 34.23 J/°, respectively at 2000 rpm. It could be said that biodiesel blended fuels burn faster and burn more fuel in mass than diesel fuel. Mass fraction burned of diesel, 5%, 10% and 20% biodiesel blended are 0.32%, 0.51%, 1.04%, and 0.78%, respectively at 2000 rpm and TDC. As a result, B10 fuel increases the combustion quality and this is the recommended blending ratio for fig seed oil biodiesel and diesel.