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Numerical study of an unstable premixed laminar flame and numerical Luenberger observers

Abstract : Combustion is a chemical reaction process present in almost all social sectors, being responsible for more than 80% of the energy primary conversion. For instance, in aircraft engines, the combustion and acoustic coupling may lead to thermoacoustic instabilities that could damage the engines, causing failures. This work focuses on the modelling, characterization and control of combustion instabilities, through computational approaches. More precisely, reactive computational fluid dynamic models, reduced order models and state observer design are used. The unstable combustion processes studied were shown to exhibit a rich frequency spectrum, and the corresponding gain and phase were favourably compared to experiments. An observer was designed using artificial neural network techniques, and its application to non linear systems evidenced the low error estimation of systems states.
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https://pastel.archives-ouvertes.fr/tel-03417236
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Submitted on : Friday, November 5, 2021 - 3:59:11 PM
Last modification on : Wednesday, November 17, 2021 - 12:31:07 PM
Long-term archiving on: : Sunday, February 6, 2022 - 7:20:31 PM

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  • HAL Id : tel-03417236, version 1

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Louise da Costa Ramos. Numerical study of an unstable premixed laminar flame and numerical Luenberger observers. Automatic Control Engineering. Université Paris sciences et lettres, 2021. English. ⟨NNT : 2021UPSLM024⟩. ⟨tel-03417236⟩

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