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Effect of the Precessing Vortex Core on Primary Atomization

Effect of the Precessing Vortex Core on Primary Atomization
Autor:

Bärow, Enrico
Gepperth, Sebastian
Koch, Rainer
Bauer, H.-J.

Links:
Quelle:

Zeitschrift für Physikalische Chemie
Band 229, Heft 6, Seiten 909–929
ISSN (Online) 2196-7156
ISSN (Print) 0942-9352, March 2015

Datum: März, 2015

The present work is focused on the airblast atomization in a gas turbine model combustor. Swirl flows in such combustion chambers form an inner recirculation zone that can develop a precessing vortex core. This instability affects the velocity field at the exit of the nozzle, where the fuel is atomized. The influence of the precessing vortex core on the airblast atomization is examined in this work. The flow field in the combustion chamber is examined under reacting and non-reacting conditions. The velocity amplitudes under reacting conditions are more than twice as high compared to non-reacting conditions. The influence of the precessing vortex core on the airblast atomization process is examined in detail at an atomization test rig with a perspex nozzle. High speed shadowgraphy and POD analysis have been performed of the liquid film on the prefilmer as well as on the ligaments formed at the atomizing edge. It was observed that although the PVC does affect the liquid film flow of the prefilming surface, it does not affect the breakup into ligaments, i. e. primary atomization.