2017
DOI: 10.1115/1.4035201
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Acoustic Damper Placement and Tuning for Annular Combustors: An Adjoint-Based Optimization Study

Abstract: Thermoacoustic instabilities pose a major threat to modern gas turbines. The use of acoustic dampers, like Helmholtz resonators, has proven useful for the mitigation of such instabilities. However, assessing the effect of acoustic dampers on thermoacoustic modes in annular combustion chambers remains an intricate task. This results from the implicit nature of the thermoacoustic Helmholtz equation associated with the high number of possible parameter values for the positioning of the dampers and their impedance… Show more

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Cited by 28 publications
(32 citation statements)
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“…Different symmetry-breaking perturbations to the burners were studied with higher-order perturbation adjoint theory in [171]. In eigenvalue optimization, Mensah and Moeck [172] calculated the optimal placement and tuning of acoustic dampers in an annular combustor; while Aguilar and Juniper [173,174] eliminated thermoacoustic oscillations by shape optimization. Recently, Silva et al [175] applied adjoint methods to calculated the critical flame index with relevance to intrinsic thermoacoustic modes.…”
Section: Thermoacousticsmentioning
confidence: 99%
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“…Different symmetry-breaking perturbations to the burners were studied with higher-order perturbation adjoint theory in [171]. In eigenvalue optimization, Mensah and Moeck [172] calculated the optimal placement and tuning of acoustic dampers in an annular combustor; while Aguilar and Juniper [173,174] eliminated thermoacoustic oscillations by shape optimization. Recently, Silva et al [175] applied adjoint methods to calculated the critical flame index with relevance to intrinsic thermoacoustic modes.…”
Section: Thermoacousticsmentioning
confidence: 99%
“…A detailed explanation of the Helmholtz equation as applied to thermoacoustics is given by Nicoud et al [40,197]. The advantage of the Helmholtz-equation framework is that it can tackle three-dimensional geometries, with the con that it holds for very small mean-flow Mach numbers and requires numerical discretization, such as finite elements (e.g., [40,166,172,[199][200][201][202]), finite volumes (e.g., [164]) or finite difference. This model is applied in Sec.…”
Section: Helmholtz Equationmentioning
confidence: 99%
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