SIMULATION OF THE EFFECTS OF SPRAY ANGLE AND PISTON BOWL DIAMETER ON THE EXHAUST GAS EMISSION OF PPCI DIESEL ENGINE

• Main Author: Farrosy, Ogya
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/79584
• Institution: Institut Teknologi Bandung

Diesel engine is a type of combustion engine commonly used in heavy-duty vehicles. Diesel engine is known for its higher thermal efficiency compared to gasoline engine because of its combustion system. One of the main challenges faced by diesel engine is pollutant control. One of the efforts to control emission formation in diesel engine is through combustion chamber geometry design to create better mixing of fuel with air. This final project discusses CFD (Computational Fluid Dynamics) simulation of combustion process inside a cylinder-shaped PPCI (Partially Premixed Compression Ignition) diesel engine combustion chamber. Simulation is done by modeling a 45o cut of a combustion chamber in 3 dimension. Spray angle and piston bowl diameter-to-bore ratio (Db/B) is varied to observe their effects on soot, hydrocarbon, NOx, and CO emission. Simulation result shows that spray angle has a significant effect on the amount of CO, HC, and soot emission, however its effect on NOx emission is not significant. Reduction of spray angle causes up to 55% reduction in CO emission, and also up to 76% reduction in HC emission. However reduction of spray angle also causes increase in soot emission by up to 631%. Piston bowl diameter-to-bore ratio (Db/B) have an effect on the amount of CO, HC, soot, and NOx emission. Reduction of Db/B ratio in general causes up to 35% reduction in NOx emission and 48% in HC emission, but it causes an increase by up to 92% in CO emission and up to 129% in soot emission.