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- W4236047977 abstract "Coherent flow structures in shear flows are generated by instabilities intrinsic to the hydrodynamic field. In a combustion environment, these structures may interact with the flame and cause unsteady heat release rate fluctuations. Prediction and modeling of these structures is thereby highly wanted for thermo-acoustic prediction models. In this work we apply hydrodynamic linear stability analysis to the time-averaged flow field of swirl-stabilized combustors obtained from experiments. Recent fundamental investigations have shown that the linear eigenmodes of the mean flow accurately represent the growth and saturation of the coherent structures. In this work biglobal and local stability analysis is applied to the reacting flow in an industry-relevant combustion system. Both the local and the biglobal analysis accurately predicts the onset and structure of a self-excited global instability that is known in the combustion community as a precessing vortex core (PVC). However, only the global analysis accurately predicts a globally stable flow field for the case without the oscillation, while the local analysis wrongly predicts an unstable global growth rate. The predicted spatial distribution of the amplitude functions using both analysis agree very well to the experimentally identified global mode. The presented tools are considered as very promising for the understanding of the PVC and physics based flow control." @default.
- W4236047977 created "2022-05-12" @default.
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- W4236047977 date "2015-06-15" @default.
- W4236047977 modified "2023-10-03" @default.
- W4236047977 title "Global and Local Hydrodynamic Stability Analysis as a Tool for Combustor Dynamics Modeling" @default.
- W4236047977 doi "https://doi.org/10.1115/gt2015-44173" @default.
- W4236047977 hasPublicationYear "2015" @default.
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