Visualization of flashback in a premixed burner with swirling flow

Abstract

In this study, the measurement object is a flame propagating in a premixed burner with swirling flow in order to investigate unsteady flame behavior in a gas turbine premixer. During flashback, the flame propagating upstream was visualized with a high-speed camera. Moreover, we established the technique to measure the instantaneous flow fields of unburned fuel-air mixture in a swirling premixed burner using particle image velocimetry (PIV). As a result, the 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. The relationship between low velocity region and flame behavior was discussed in detail.