Abstract
Flame stabilization (holding) in gas turbines is most often done by formation of swirl. The swirling motion may lead to vortex break-down which allows transport of hot gases back towards the fresh mixture and thereby maintains the flame. However, swirling jets are inherently unstable. This instability affects also the flame even without acoustical feedback. The talk shall describe experimental and Large Eddy Simulation (LES) of premixed flames in an academic burner, resembling modern industrial gas turbine burners. The experiments include measuring simultaneously the velocity and concentration fields. These results are compared to the LES data. Mechanisms for flame stabilizations are discussed.
