What is it about?
Thermoacoustic combustion instabilities are a severe challenge for the development of reliable, low-emission and flexible combustion technology for propulsion and power generation. These self-excited instabilities result from feedback between flow, flame and acoustics. Unless effectively controlled, they can lead to limited operating range, increased emissions, or even rapid destruction of a combustion systems
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Why is it important?
Intrinsic thermoacoustic (ITA) modes results from a flow/flame/acoustic feedback mechanism that has escaped attention until recently. The ITA feedback loop may be described as follows: An upstream velocity disturbance induces a modulation of the heat release rate, which in turn generates an acoustic wave traveling in the upstream direction, where it influences the acoustic velocity and thus closes a feedback loop. This feedback has important consequences for the dynamics and stability of combustion processes. This paper reports for the first time on ITA modes observed in high-resolution simulations of a premixed laminar flame in an anechoic environment. This gives convincing evidence that such "intrinsic modes" - first described and discussed by the group at TU/e - are not merely an artefact of simplistic low-order models. Our results were corroborated by Courtine et al (CNF 162, 11, 2015).
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This page is a summary of: Numerical study on intrinsic thermoacoustic instability of a laminar premixed flame, Combustion and Flame, September 2015, Elsevier,
DOI: 10.1016/j.combustflame.2015.06.003.
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