Computational fluid dynamics (CFD) modelling of hydrogen combustion in a spherical combustor

In this thesis, the combustion and emission performances of hydrogen have been numerically investigated in a spherical combustor. Hydrogen combustion was modelled by using CFD code Ansys Fluent.This thesis consists of six chapters. Introduction and literature survey were given at the first part of thesis. Then, general information about hydrogen energy combustion, air pollution, NOx emission and decrease techniques of NOx emissions are given at the second part. In the third chapter, general information about CFD modelling and the fundamental equations were mentioned. CFD modelling for a spherical combustor and boundary condutions were determined at the fourth part. In the fifth chapter, CFD modelling results were presented in figures. Finally conclusions and advices for future studies were given at the final chapter of this thesis.As a result of modelling, temperature, velocity and NOx emission distributions have been performed. Hydrogen combustion was modelled different thermal powers (40 and 60 kW) and different excess air ratios (?=0.9, ?=1.0, ?=1.1 and ?=1.2). According to this results, the value of NOx emissions in high temperature zones were more than the value of NOx emissions in low temperature zones. Also, the flame temperature decreased with increasing excess air ratio in all thermal power conditions.