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LES and acoustic analysis of thermo-acoustic instabilities in a partially premixed model combustor

Hernández, Ignacio and Staffelbach, Gabriel and Poinsot, Thierry and Román Casado, Juan C. and Kok, Jim B.W. LES and acoustic analysis of thermo-acoustic instabilities in a partially premixed model combustor. (2013) Comptes Rendus de l'Academie des Sciences - Séries II, Mécanique, 341 (1-2). 121-130. ISSN 1631-0721

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Official URL: http://dx.doi.org/10.1016/j.crme.2012.11.003

Abstract

Numerical simulations were performed using Large Eddy Simulation (LES) and acoustic analysis tools to study thermo-acoustic instabilities in an academic burner. The configuration studied corresponds to a methane/air burner installed at the University of Twente (The Netherlands). It operates under fuel-lean partially premixed conditions at atmospheric pressure, and was built to study thermo-acoustic instabilities in conditions representative of gas turbine Lean Premixed systems: gaseous fuel is injected upstream of the combustor and has a limited time to mix with air. Even though the objective is to burn in a premixed mode, the actual regime corresponds to a partially premixed flame where strong equivalence ratio variations are created especially during combustion instabilities. Capturing these modes with LES is a challenge: here, simulations for both stable and unstable regimes are performed. In the unstable case, the limit cycle oscillations (LCO) are characterized and compared to experimental results. Reasonable agreement is found between simulations and experiments.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The original publication is available at http://www.sciencedirect.com
HAL Id:hal-00930014
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > University of Twente (NETHERLANDS)
Laboratory name:
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Deposited By: Thierry POINSOT
Deposited On:14 Jan 2014 10:10

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