Analysis of the Effect of Biodiesel Mixtures on Pressure, Temperature, and Heat Release Rate in Diesel Engines

Abstract

This study analyzes the effect of biodiesel blends on the combustion characteristics of diesel engines, including in-cylinder pressure, in-cylinder temperature, and Rate of Heat Release (ROHR) at 75% and 100% loads. The fuels used were pure diesel (DB100) and biodiesel blends with compositions F10B10, F20B10, F20B20, and F30B10. The results showed that peak in-cylinder pressure increased with the use of biodiesel. At 75% load, the maximum pressure for DB100 was 69 bar, while F30B10 reached 72 bar. At 100% load, the maximum pressure for DB100 was 70 bar, while F30B10 increased to 74 bar. In addition, the in-cylinder temperature also increased with the biodiesel blend. At 75% load, the peak temperature for DB100 was recorded at 1480 K, while F20B20 reached 1550 K. At 100% load, the temperature increased to 1600 K for DB100 and 1700 K for F10B10. ROHR analysis showed that biodiesel increased energy release compared to pure diesel. At 75% load, DB100 had a peak ROHR of 52,000 kW, while F30B10 reached 57,000 kW. At 100% load, DB100 recorded a ROHR of 48,000 kW, while F30B10 increased to 58,000 kW. The results of this study indicate that biodiesel blends can improve combustion efficiency, which is characterized by increased pressure, temperature, and heat release. However, this increase can also cause an increase in NOₓ emissions, so an emission mitigation strategy is needed to balance energy efficiency and environmental impacts.