TY - JOUR
TI - The determination of optimum injection pressure in an engine fuelled with soybean biodiesel/diesel blend
AU - Çelik M Bahattin
AU - Şimşek Doğan
JN - Thermal Science
PY - 2014
VL - 18
IS - 1
SP - 229
EP - 238
PT - Article
AB - In this study, the optimum blend rate and injection pressure in a  four-stroke, single cylinder, direct injection diesel engine using soybean  methyl ester were investigated experimentally. The tests were conducted at  two stages. Firstly, the engine was tested with diesel fuel, B25 (25%  biodiesel+75% diesel fuel), B50, B75 and B100 fuels at full load and at a  constant speed. According to the test results, it was determined that the  most suitable fuel was B25 in terms of performance and emission. Secondly,  the engine was tested at different loads with diesel fuel at original  injection pressure and with B25 at different injection pressures (160, 180,  200, 220, 240 bar) for comparison. It was determined from tests performed  with B25 that the most suitable injection pressure in terms of performance  and emissions was 220 bar. The specific fuel consumption and power values of  the B25 were found to be nearly the same as those of diesel fuel at 220 bar  injection pressure. In addition, HC, CO, and smoke emissions were reduced by  about 33%, 9% and 20%, respectively. On the other hand, NOx emission  increased by about 12%.