Turbulens perdületes láng akusztikai diagnosztikája

Abstract

In order to fulfill the continuously stringent emission standards, lean premixed flames are used. However, such an operation results in an operation near the lean blowout limit which can be diagnosed by acoustic devices. During the investigation, a 15 kW lean premixing prevaporizing-type swirl burner was used. Diesel oil was utilized as fuel which was atomized by an airblast atomizer. Depending on the swirl number, straight, V-shaped, and in the transition regime both can be observed. Therefore, a bistable region separates the two regimes in which the equivalent sound pressure level was investigated and its relation to the flame shapes.