Failure of thermoacoustic instability control due to periodic hot gas ingestion in Helmholtz dampers

Miniero, Luigi; Mensah, Georg A.; Bourquard, Claire; Noiray, Nicolas

doi:10.1016/j.jsv.2022.117544

Cited by 10 publications

(1 citation statement)

References 42 publications

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“…Typical examples of the former are noise suppression appliances in steam piping [12][13][14] of nuclear power plants or exhaust mufflers of internal combustion engines [15], where apart from the classical passive approach used for decades, there have also been recent developments on active solutions [16]. A representative case of the thermoacoustic instability control is a Helmholtz resonator, which, although a well-studied system, is still an area of active research due to the challenges posed by nonlinear effects exacerbated by the extreme environment in a combustion chamber [17]. Practical aspects of aeroacoustic instabilities, on the other hand, could be aiming at suppressing the effect [16] or exploiting it in a controlled fashion such as the design of a musical instrument [18] or an aeroacoustic limit cycle scatterer [19].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear acoustics of an aperture under grazing flow

Stoychev,

Pedergnana,

Noiray

2024

Proc. R. Soc. A.

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This work presents a mathematical model of a dynamically forced, acoustically compact aperture subject to one-sided mean grazing flow in two or three dimensions. By contrast to other simplified theoretical representations of a grazed aperture, the one proposed in this contribution considers some of the nonlinear effects a reduced order model should naturally inherit from the conservation equations governing the primary system’s dynamics. Furthermore, unlike other nonlinear developments, this one is able to reproduce the acoustic forcing amplitude dependence of the fundamental-frequency-based impedance, measured in recent experiments, without relying on empirical parameters. This nonlinear model offers further insight into the dominant physical mechanisms determining the aforementioned behaviour and allows reasonable a priori estimates of the aeroacoustic dynamics of the aperture. This could be used as a building block of more sophisticated systems or for the derivation of even simpler representations suitable for acoustic network modelling.

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