G0600-7-5 Characteristics of flame propagating in a premixed burner with swirling flow

Abstract

Lean premixed combustion is one of the most efficient techniques to reduce nitrogen oxide(NOx) emission. However, a lean premixed combustor has a risk of flashback. In this study, we present characteristics of flame propagating in a premixed burner with swirling flow in order to investigate unsteady flame behavior in a gas turbine premixed burner. During flashback, the flame propagating upstream was visualized with a high-speed camera. Moreover, we established the technique to measure the instantaneous flow fields in a model premixed burner using stereo PIV. As a result, characteristics of flame behavior propagating upstream were examined And it was found that a low velocity region existed in the vicinity of the flame tip and vortex core of swirling flow existed along the center axis with precession movement In this paper, the relationship between the flow field in the model premixed burner and the flame behavior was discussed in detail.