Experimental Investigation of Effect of Injection Pressure on Performance of a Diesel Engine using Blends of Biodiesel and Diesel

Biodiesel is an alternative fuel for diesel engine. Considering the differences between diesel and biodiesel fuels, engine condition should be modified based on the fuel or fuel blends to achieve optimum performance. In this study, performance of a diesel engine using biodiesel was investigated. Different experiments were carried out on a diesel engine using different blends of diesel and biodiesel fuels choosing speeds of 1200, 1600, 2000, and 2400 rpm. During experiments, the fuel injection pressure into cylinder was regulated on 185, 200 and 215 bar. The results of torque and brake specific fuel consumption for fuel blends of B20, B40, and B100 in different engine speeds and injection pressures were recorded and compared. The results of this research work showed that increasing fuel injection pressure for fuel blends of B20, B40, and B100 increased torque about 4.9%, 6.5% and 8.1% respectively and decreased maximum brake specific fuel consumption about 12%, 12.6% and 9.2% respectively. Also, the exhuast gas temperature and peak pressure of cylinder were increased by increasing the injection pressure.