Flame Analysis System for Methane-Ammonia Diffused Gas Using Schlieren Technique

Abstract

Optical diagnostics utilizing imaging system have been significant in the experiments of combustion and fluids. Nonetheless, the majority of imaging techniques primarily focus on the analysis of premixed flames. As the interest in alternative fuel systems utilizing diffused gas increases, there is a high demand for the advancement of methods that enable the analysis of diffused flames. The objective of this research is to create a novel Schlieren system by utilizing the Z-type Schlieren technique in experimental settings, building upon the conventional methodology. Additionally, various aspects of fluid mechanics and combustion, including Schlieren imaging, have been explored through the application of multiple optical methods. Schlieren technique is an effective method for combustion diagnostics, based on the fact that light rays are bent whenever they encounter changes in the density of a fluid. Schlieren system is generally used to visualize the flow away from the surface of an object. This research applied the well-known Schlieren setup to analyze methane-ammonia diffused gas from which the hot air around the flames could be visualized. The setup has been designed by using Z-type Schlieren technique to emphasize the three major aspects of light (refraction, coma, and astigmatism). By implementing this system, the diffused flame initialization, formation, lift off and blow out could be projected and analyzed for methane-ammonia diffused flame.