Analysis of Unsteady Motion with Respect to Noise Sources in a Gas Turbine Combustor: Isothermal Flow Case |
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| Authors: | F Flemming C Olbricht B Wegner A Sadiki J Janicka F Bake U Michel B Lehmann I Röhle |
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| Institution: | (1) Institute for Energy and Powerplant Technology, Darmstadt University of Technology, Petersenstr. 30, D-64287 Darmstadt, Germany;(2) DLR – Institute of Propulsion Technology, German Aerospace Center, Müller-Breslau-Str. 8, D-10623 Berlin, Germany |
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| Abstract: | In order to evaluate the direct and indirect contributions to the total combustion noise emission, a combustion chamber consisting
of a swirl burner and an exit nozzle of Laval-shape, representing a gas turbine combustor, is investigated by means of experiments
and large eddy simulation. Focused on the isothermal flow case first and encouraged by a good overall agreement between the
LES and the experimental data for the flow field, a first characterisation of the flow with respect to noise sources is performed.
To analyse acoustic properties of the flow, time and length scales are evaluated inside the combustor. Furthermore, the evidence
for the existence of a precessing vortex core (PVC), typical for configurations with swirl, is revealed. Finally, the effect
of the PVC on the flow inside the Laval nozzle is discussed. |
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| Keywords: | gas turbine combustor large eddy simulation noise sources length scales precessing vortex core |
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