| The objectives of this thesis are the investigation of the characteristics of partially premixed disk-stabilized flames. Among them, chemical reaction and NO/NOx emission in partially premixed disk-stabilized flame are the main topics. The present work includes experimental studies and numerical modelling.; An intensive experimental investigation been carried out to study the characteristics of chemical reaction, NO/NOx emissions and visual characteristics of a partially premixed bluff-body stabilized flame.; In order to understand better the mechanism of chemical reaction and the NOx, formation of the flame, two factors, the Spatial Reaction Index (SRI) and the Modified Mixture Fraction (MMF), have been established respectively.; A numerical model for the disk-stabilized flame, which provided the information about its detailed chemical reactions and NOx formation by burning butane in air, has been developed. Predictions obtained by using the model were compared with the experimental results.; By carrying out the preset experimental and numerical studies, I have made the following contributions towards a better understanding of the partially premixed bluff body stabilized flame. (1) A non-traditional approach, the image-processing technique, has been applied to analyze the visual characteristics of the partially premixed disk-stabilized flame. (2) The present experimental results provide an excellent database for predicting the NO/NOx formation mechanisms in the disk-stabilized flame. (3) A Spatial Reaction Index (SRI), which is the ratio of O2 chemical reaction rate to O2 mass transfer rate, based on the present experimental results has been proposed. (4) A Modified Mixture Fraction (MMF), which is the mess ratio of the carbon containing species to all gaseous species, has also been proposed based on the present experimental findings. (5) A numerical model of the disk-stabilized flame, which is based on the calculation codes of a Perfect Stirred Reactor, has been developed. (Abstract shortened by UMI.)... |
