March 10~14, 2015 GWANGJU, KOREA, The 21st International Symposium on Alcohol Fuels
Title : Effects of Pilot Injection Strategies on Flame Temperature and Soot Distributions in an Optical Single-Cylinder CI Engine Fueled with Biodiesel and Conventional Diesel
Authors : Joonho Jeon, Sungwook Park
Speaker : Joonho Jeon
Abstract : Among alternative fuel, biodiesel has been emerged as an eco-friendly fuel in the compression-ignition engine. The investigations of biodiesel combustion have been performed with various aspects and methodologies. In this study, the effect of pilot injection strategies on flame temperature and soot distribution was conducted experimentally using an optical CI engine fueled with biodiesel. The pilot injection decreases the pressure rise rate and rapid combustion starting, increasing ambient temperature and pressure before the main injection. The endoscopy system captured the spray development and combustion processes in the cylinder. In addition, obtained pictures were used to estimate the flame temperature and soot distribution using the post-processing program. In this study, the KIVA/CHEMKIN code was used to enhance the understanding of pilot combustion characteristics. Numerical results supported more information which cannot be obtained from physical experiments. The experimental conditions were composed of various pilot injection timings and quantities. Furthermore, engine speed and other conditions were fixed to investigate only the effect of pilot injection. The experimental results showed that flame temperature was decreased with the increase in pilot fuel mass. Biodiesel combustion generated high flame temperature and low soot concentrations compared to the neat diesel combustion.
March 10~14, 2015 GWANGJU, KOREA, The 21st International Symposium on Alcohol Fuels
Title : Effects of Pilot Injection Strategies on Flame Temperature and Soot Distributions in an Optical Single-Cylinder CI Engine Fueled with Biodiesel and Conventional Diesel
Authors : Joonho Jeon, Sungwook Park
Speaker : Joonho Jeon
Abstract : Among alternative fuel, biodiesel has been emerged as an eco-friendly fuel in the compression-ignition engine. The investigations of biodiesel combustion have been performed with various aspects and methodologies. In this study, the effect of pilot injection strategies on flame temperature and soot distribution was conducted experimentally using an optical CI engine fueled with biodiesel. The pilot injection decreases the pressure rise rate and rapid combustion starting, increasing ambient temperature and pressure before the main injection. The endoscopy system captured the spray development and combustion processes in the cylinder. In addition, obtained pictures were used to estimate the flame temperature and soot distribution using the post-processing program. In this study, the KIVA/CHEMKIN code was used to enhance the understanding of pilot combustion characteristics. Numerical results supported more information which cannot be obtained from physical experiments. The experimental conditions were composed of various pilot injection timings and quantities. Furthermore, engine speed and other conditions were fixed to investigate only the effect of pilot injection. The experimental results showed that flame temperature was decreased with the increase in pilot fuel mass. Biodiesel combustion generated high flame temperature and low soot concentrations compared to the neat diesel combustion.