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Analytical methods for azimuthal thermo-acoustic modes in annular combustion chambers

Bauerheim, Michaël and Poinsot, Thierry Analytical methods for azimuthal thermo-acoustic modes in annular combustion chambers. (2015) Annular Research Brief of CTR. 77-88.

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Official URL: https://ctr.stanford.edu/sites/g/files/sbiybj7546/f/10_poinsot.pdf


Large power densities in gas turbines can be accompanied by combustion instabilities (Culick & Kuentzmann 2006; Lieuwen & Yang 2005) due to a coupling between the flames and acoustics, creating high pressure and heat release oscillations in the chamber. Such oscillations may destroy the whole propulsion system and combustion instabilities have been a key issue for aeronautics and propulsion systems (Candel 2002; Culick & Kuentzmann 2006; Lieuwen & Yang 2005) especially in high-performance engines (Harrje & Reardon 1972; Culick 1987) for a long time. Full-scale experiments in this field are difficult (Poinsot et al. 1987; Lee & Lieuwen 2003; Lee & Anderson 1999) and numerical simulations have been used heavily to replicate the complex mechanisms involved in combustion instabilities in full-scale geometries (Wolf et al. 2009; Staffelbach et al. 2009; Wolf et al. 2010). These simulations are not sufficient to understand or control unstable modes: low-order models and theory on simplified geometries (Dowling 1995, 1997; Kopitz et al. 2005; Nicoud et al. 2007) are needed to guide both large-eddy simulations (LES) and experiments. Annular chambers used in gas turbines sometimes exhibit a specific class of unstable modes: azimuthal modes (Figure 1) propagating along the azimuthal direction eθ and not only in the longitudinal direction ez (Candel 1992; Crighton et al. 1992; Lieuwen & Yang 2005; O’Connor et al. 2015). Mechanisms leading to azimuthal instabilities are more complex than those encountered in longitudinal configurations.

Item Type:Article
Audience (journal):International journal (no peer-reviewed)
Uncontrolled Keywords:
Institution:Other partners > Airbus (FRANCE)
French research institutions > Centre National d'Études Spatiales - CNES (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > EDF (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
French research institutions > Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE)
Other partners > Total (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Centre Européen de Recherche et Formation Avancées en Calcul Scientifique - CERFACS (FRANCE)
Other partners > Météo France (FRANCE)
Other partners > SAFRAN (FRANCE)
Laboratory name:
Deposited On:18 Jun 2019 11:44

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