This contribution demonstrates the use of a compact high repetition rate pulsed high power LED light source in
combination with a high speed camera to obtain high speed shadowgraphs of an airblasted spray in a fired research
combustor at medium pressures. The temporally resolved structures are subjected to conventional spectral analysis
and exhibit very dominant fundamental frequencies throughout the visualized spray structures. The image data is
further compared to time series of drop-sizing measurements made by a phase Doppler instrument. The periodicity
is attributed to a spiraling spray release from the nozzle lip that is believed to be induced by a precessing vortex or
vortices orbiting around the burner axis