Comptes Rendus
Combustion, flow and spray dynamics for aerospace propulsion
LES and acoustic analysis of thermo-acoustic instabilities in a partially premixed model combustor
Comptes Rendus. Mécanique, Volume 341 (2013) no. 1-2, pp. 121-130.

Numerical simulations were performed using Large Eddy Simulation (LES) and acoustic analysis tools to study thermo-acoustic instabilities in a methane/air academic 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.

Des simulations numériques sont effectuées avec des outils dʼanalyse acoustique et de Simulation aux Grandes Échelles (SGE) pour étudier des instabilités thermo-acoustiques dans un brûleur académique méthane/air installé à lʼUniversité de Twente (Pays Bas). Le dispositif fonctionne aux régimes pauvres à pression atmosphérique et a été conçu pour être enclin aux instabilités thermo-acoustiques. Cʼest une configuration proche des systèmes LPP installés dans les turbines à gaz : le fuel est injecté pur en amont de la chambre mais a peu de temps pour se mélanger avec lʼair. Le système fonctionne donc avec de grandes variations de richesse, surtout pendant les modes instables. Prévoir ces modes avec la LES est un défi. Ici, des simulations sont faites pour des régimes stables et instables. Dans le cas instable, les oscillations du cycle limite sont caractérisées et comparées aux résultats expérimentaux. Un bon accord est trouvé entre simulations et expériences.

Published online:
DOI: 10.1016/j.crme.2012.11.003
Keywords: Combustion, Thermo-acoustics, Limit cycles, Large Eddy Simulation
Mot clés : Combustion, Thermo-acoustique, Cycles limite, Simulation aux Grandes Échelles

Ignacio Hernández 1; Gabriel Staffelbach 1; Thierry Poinsot 2; Juan C. Román Casado 3; Jim B.W. Kok 3

1 CERFACS, 42, Avenue Gaspard-Coriolis, 31057 Toulouse, France
2 CNRS, Institut de Mécanique des Fluides, 31400 Toulouse, France
3 University of Twente, Laboratory of Thermal Engineering, P.O. Box 217, 7500 AE Enschede, The Netherlands
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Ignacio Hernández; Gabriel Staffelbach; Thierry Poinsot; Juan C. Román Casado; Jim B.W. Kok. LES and acoustic analysis of thermo-acoustic instabilities in a partially premixed model combustor. Comptes Rendus. Mécanique, Volume 341 (2013) no. 1-2, pp. 121-130. doi : 10.1016/j.crme.2012.11.003. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2012.11.003/

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