Impact of wall heat transfer in Large Eddy Simulation of flame dynamics in a swirled combustion chamber
| Autor: | Davide Laera, Pasquale Walter Agostinelli, Thierry Poinsot, Isaac Boxx, Laurent Gicquel |
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| Rok vydání: | 2021 |
| Předmět: |
Work (thermodynamics)
Materials science Conjugate Heat Transfer Thermoacoustic instabilities General Chemical Engineering Flow (psychology) General Physics and Astronomy Energy Engineering and Power Technology Large Eddy Simulation Turbulent flames 01 natural sciences 010305 fluids & plasmas Physics::Fluid Dynamics 0103 physical sciences Dynamic mode decomposition kHz validation data Boundary value problem 010306 general physics Physics::Atmospheric and Oceanic Physics flame dynamics General Chemistry Mechanics wall heat transfer swirl Fuel Technology LES Heat transfer Combustor Combustion chamber Large eddy simulation |
| Zdroj: | Combustion and Flame |
| DOI: | 10.5281/zenodo.6602121 |
| Popis: | Large Eddy Simulation (LES) is a fundamental research tool to study gas turbines and aero-engine combustors. In LES, although rarely addressed systematically, it is known that thermal boundary conditions control the heat transfer between the flow and the combustor walls. This work presents a study on the impact of thermal wall boundary conditions for the PRECCINSTA test bench, operated by the German Space Agency (DLR). Two approaches are tested: Heat Resistances Tuning (HRT), where a local resistance is tuned using experimental temperature data, and full Conjugate Heat Transfer (CHT), where the chamber wall-temperature is solved and coupled to the flow computation. Results reveal that the HRT method captures the mean flame correctly but the predicted flame becomes unstable and responds to a thermoacoustic oscillation which is not observed experimentally. On the contrary, using CHT, the flame is correctly predicted and stable as in the experiments. Finally, to understand the differences between the HRT and the CHT simulations, Dynamic Mode Decomposition (DMD) analysis is performed showing that the correct response of the flame branches to the pressure oscillations is recovered only in the CHT simulations for which thermoacoustically stable operations are retrieved. |
| Databáze: | OpenAIRE |
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