Abstract
The present study is an experimental investigation on the effect of axial and transverse acoustic excitation on a swirl-stabilized flame. A single burner test-rig with transverse extensions to facilitate transverse acoustic excitation is employed in this experimental study. The swirl flow is established using a generic radial swirl generator. Results presented here include phase-averaged crosswise flow field oscillations at isothermal flow conditions and partial orthogonal decomposition (POD) analysis of flow field acquired in the streamwise plane at isothermal and reacting conditions. Through analysis of radial velocity profile oscillations obtained from crosswise measurements and modal decomposition of the velocity field in the streamwise direction, conclusions have been derived for flow and flame response to transverse forcing. It is found that while out-of-phase transverse forcing can interact with natural helical oscillations in the swirl flow, the effect of in-phase forcing is dominantly observed in the form of flow response to induced axial oscillations. The study complements previous investigations on swirl flow and flame interaction with transverse acoustics, and provides information for future efforts on the issue of thermoacoustic instability in annular combustors.
Published Version
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