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Assessment of thermoacoustic instabilities in a partially premixed model combustor using URANS approach

Authors
Journal
Applied Thermal Engineering
1359-4311
Publisher
Elsevier
Publication Date
Volume
71
Issue
1
Identifiers
DOI: 10.1016/j.applthermaleng.2014.06.068
Keywords
  • Partially Premixed Combustion
  • Thermoacoustic Instabilities
  • Combustion Modeling
  • Heat Transfer
  • Rans Solver
  • Limit Cycle Of Pressure Oscillations
Disciplines
  • Musicology
  • Physics

Abstract

Abstract The paper presents a numerical study of the mechanisms driving thermoacoustic instabilities in a lean partially premixed combustor in conditions representative of gas turbine combustion systems. Various combustion models and modeling approaches able to predict the onset of thermoacoustic instabilities are examined and applied to the experimental test rig in order to assess their validity. The influence of the imposed acoustic and thermal boundary conditions on characterization of the coupling between heat release rate fluctuations and the acoustic field is investigated. Predicted data is used to improve the understanding of mutual interactions between pressure fluctuations and unsteady heat release in the unstable combustors which play an essential role in characterizing limit-cycle behavior. The mean convective time delay between heat release and the perturbation in the flow is used to determine the stability condition of the combustor. The study shows that heat transfer is important parameter regulating pressure oscillations.

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