Análisis de reflujo de flama en combustores tangenciales de flujo giratorio

Premixed lean combustion is widely used in Combustion Processes due to the benefi ts of good fl ame stability and blowoff limits coupled with low NOx emissions.However, the use of novel fuels and complex fl ows have increased the concern about fl ashback, especially for the use of syngas and highly hydrogen enriched blends.Thus, this paper describes a combined practical and numerical approach to study the phenomenon in order to reduce the eff ect of fl ashback in a pilot scale 100 kW tangential swirl burner.Natural gas is used to establish the baseline results and eff ects of diff erent parameters changes.The fl ashback phenomenon is studied with the use of high speed photography.The use of a central fuel injector demonstrates substantial benefi ts in terms of fl ashback resistance, eliminating coherent structures that may appear in the fl ow channels.The critical boundary velocity gradient is used for characterization, both via the original Lewis and von Elbe formula and via analysis using CFD and investigation of boundary layer conditions in the fl ame front.