Premixed hydrogen combustion is increasingly important as a technology for decarbonizing high-temperature industrialprocesses. The design flexibility enabled by additive manufacturing provides new opportunities to realizecomplex burner geometries that are difficult or impossible to produce with conventional methods. By coupling it withgeometry optimization based on numerical simulations, the development of burners with increased stability, extendedfuel and power flexibility, and reduced pollutant emissions becomes possible. In this study, three different modularburner nozzle designs are systematically compared with respect to these optimization targets using a newly developeddiagnostic framework. Distinct differences between the nozzle configurations are identified in terms of their operationalrange, as characterized by flame stability maps. Simultaneous OH and CH2O planar laser-induced fluorescence(PLIF), in combination with OH* chemiluminescence measurements, are employed to analyze the main location ofheat release. Complementary infrared measurements of both the nozzle and the flame temperature (at a fixed locationin the flames) reveal strong correlations between flame stability characteristics, heat release location, and a possiblefeedback into the nozzle material. We conclude that these mainly result from the difference between the local mixturedistribution of the nozzles. Based on this experimental framework, the characterization and evaluation of optimizeddesign geometries become possible.
Faderl et al. (Mon,) studied this question.