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

I. Hernandez, G. Staffelbach, T. Poinsot, J.C. Roman Casado, Jacobus B.W. Kok

Research output: Contribution to journalArticleAcademicpeer-review

25 Citations (Scopus)

Abstract

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
Original languageEnglish
Pages (from-to)121-130
JournalComptes rendus mécanique
Volume341
Issue number1-2
DOIs
Publication statusPublished - 2013

Keywords

  • METIS-295550
  • IR-85351

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