Mississippi State University
Date of Degree
Graduate Thesis - Open Access
Master of Science
James Worth Bagley College of Engineering
Department of Mechanical Engineering
Diesel and biodiesel combustion in a light duty compression ignition engine were simulated during a closed cycle, using a commercial computational fluid dynamics (CFD) code, CONVERGE. The corresponding computational domain was constructed for the engine based on combustion chamber geometry and compression ratio measurements. Submodels were calibrated for simulation. The results were able to capture the experimental pressure and apparent heat release rate trends for both fuels over a range of engine loads and fuel injection timings. NOx emissions trends were captured for diesel, while under-predicted for biodiesel. The NOx trends were also analyzed based on the thermal NO mechanism. A new modular tool in Matlab was developed for studying the residence time. It was found that high in-cylinder temperatures and their residence time are critical in NOx formation.
Wang, Zihan, "A Computational Study of Diesel and Biodiesel Combustion and Nox Formation in a Light-Duty Compression Ignition Engine" (2012). Theses and Dissertations. 80.