Assessment of LES of intermittent soot production in an aero-engine model combustor using high-speed measurements

Autor: B. Franzelli, L. Tardelli, M. Stöhr, K.P. Geigle, P. Domingo
Přispěvatelé: Laboratoire d'Énergétique Moléculaire et Macroscopique, Combustion (EM2C), CentraleSupélec-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), DLR Institut für Verbrennungstechnik / Institute of Combustion Technology, Deutsches Zentrum für Luft- und Raumfahrt [Stuttgart] (DLR), Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU), This work was performed using HPC resources from GENCI-CINES (Grant 2021-A0112B12029). B. Franzelli acknowledges the support of the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (., European Project: 690724.,SOPRANO, European Project: 757912,SOTUF
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Proceedings of the Combustion Institute
Proceedings of the Combustion Institute, 2022, ⟨10.1016/j.proci.2022.09.060⟩
ISSN: 1540-7489
DOI: 10.1016/j.proci.2022.09.060⟩
Popis: International audience; Soot production in turbulent flames is an extremely intermittent phenomenon since it is the result of specific thermochemical conditions occasionally occurring in space and time. In realistic configurations such as the swirling flames used in gas-turbines, the presence of large-scale flow motions can additionally affect soot formation processes, leading to even more pronounced intermittency. Classically, the validation of numerical simulations is performed by comparing time-averaged results with experimental data of the phenomenon under investigation. This comparison can be considered as rigorous only if a statistically converged numerical representation is obtained. In case of sporadic events such as intermittent soot formation in turbulent flames, this means to perform the simulation over thousands of milliseconds of physical time, which can have extremely high CPU demands when performing Large Eddy Simulation (LES). In this work, a possible strategy to overcome this issue is proposed based on the use of high-speed measurements and numerically synthesized signals from LES. To illustrate the approach, numerical and experimental soot light scattering signals are considered here by looking at the model aero-engine combustor developed at DLR for the study of pressurized swirled sooting flames. The light scattering signal is numerically synthesized from an LES. Experimental high-speed measurements are used to statistically account for the high temporal and spatial variability of soot when considering time intervals similar to what is today achievable with LES. The feasibility of this approach is finally demonstrated by comparing numerical results to the ensemble of possible soot production states observed experimentally in the DLR burner allowing to eventually validate the present LES results.
Databáze: OpenAIRE
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