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• W4313368004 endingPage "117544" @default.
• W4313368004 startingPage "117544" @default.
• W4313368004 abstract "Passive damping devices such as Helmholtz dampers are often employed in gas turbines to mitigate thermoacoustic instabilities. The periodic ingestion of the combustion chamber hot gas in the resonant cavity of Helmholtz dampers can be a serious issue, if not considered in the design phase of these devices. The periodic hot gas ingestion modulates the density in the damper neck and thereby the damper’s resonance frequency. This effect, combined with the nonlinearities in the acoustic damping caused by the periodical reversal of the flow direction in the neck, can prevent the intended control of the thermoacoustic feedback. Despite its relevance for gas turbine design, this topic has not received significant attention in literature. This study presents experimental and theoretical investigations of that problem. A physics-based model is derived with a few empirical parameters, calibrated with data which were collected from an experimental setup comprising a tunable Helmholtz damper connected to a combustor operated at atmospheric pressure. This model of noise-driven coupled oscillators with nonlinear damping and stiffness is capable of reproducing the bistable dynamics observed in the experiments for specific ranges of equivalence ratios. The model is then used to draw general conclusions about the robustness of dampers with respect to this unwanted phenomenon. In particular, the influence of the geometry and flow conditions on the damping and stiffness nonlinearities, which both participate to possible failure of the passive control, is described. We show that in the case of broadband dampers, the effect of the nonlinear stiffness is weaker than the one of damping nonlinearity, and that it can become significant for more narrow-band dampers. The results can be used for designing acoustic dampers that are robust with regard to the risk of spontaneous loss of thermoacoustic stability due to periodic hot gas ingestion." @default.
• W4313368004 created "2023-01-06" @default.
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• W4313368004 date "2023-03-01" @default.
• W4313368004 modified "2023-10-18" @default.
• W4313368004 title "Failure of thermoacoustic instability control due to periodic hot gas ingestion in Helmholtz dampers" @default.
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• W4313368004 doi "https://doi.org/10.1016/j.jsv.2022.117544" @default.
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