Thermoacoustic modal instability and its suppression with locally resonant flexible membranes

Liu, Yang; Du, Jingtao; Li, Cheng

doi:10.1016/j.combustflame.2021.111859

Cited by 5 publications

(6 citation statements)

References 38 publications

(40 reference statements)

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“…Based on our previous study, 7 it was found that the instabilities of thermoacoustic modes are determined by the relationship between the flame position and the acoustic mode shape. More specifically, the system is stable when the flame is located at the pressure drop (PD) region, but instable at the pressure rise (PR) part, which is consistent with the well-known Rayleigh criterion.…”

Section: Numerical Results and Analyses A Mode Classification Inside ...mentioning

confidence: 99%

“…The similarity (and the tiny differences) among them is due to the vibration behavior of each membrane-cell, which is identical but installed at different locations. Based on the aforementioned PD-PR criterion, 7 it is anticipated that these DMC modes would feature similar stability properties. It should be noted that the highorder mode characteristics are of less concern in practice.…”

Section: Numerical Results and Analyses A Mode Classification Inside ...mentioning

confidence: 99%

“…( 25) represents the velocity fluctuation generated by the unsteady rate of the flame heat release. In this work, a linear n-s flame model is adopted, 7 with the coefficient of heat release rate written as…”

Section: Model Descriptionmentioning

confidence: 99%

“…4,5 In that sense, acoustic modal characteristics exert vital influence on TAI. 6,7 In addition to acoustic modes, which mainly depend on the system geometry, intrinsic modes were also shown to exist by recent research. [8][9][10] Studies show that the heat source or flame can give rise to a completely new family of system modes due to the local feedback loop formed in the coupled system.…”

Section: Introductionmentioning

confidence: 99%

“…28 The underlying control mechanism underpinning the modal instability was revealed in the context of locally resonant flexible membranes. 7 Studies show two different physical processes associated with acoustic and intrinsic modes, respectively. Despite their demonstrated success, passive methods are usually effective over a narrow frequency range or for specific targeted modes, thus, showing limited control capability, especially in complex combustion operating conditions.…”

Section: Introductionmentioning

confidence: 99%

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Multi-modal thermoacoustic instability suppression via locally resonant and Bragg bandgaps

Liu

2022

The Journal of the Acoustical Society of America

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Thermoacoustic instability is a common occurrence in combustors, yielding self-sustained oscillations and causing potential risk, such as severe structural damage. In this paper, modal instability suppression inside a duct is studied using periodically arranged membranes within the framework of a linear heat release n- τ model embedded into a fully coupled energy-based model. The periodic arrangement of the membranes along the duct sidewall enables locally resonant and Bragg scattering bandgaps, shown to be conducive for the stabilization of unstable thermoacoustic modes. Eigen-modes are classified into different groups, which call for specific control actions in relation with the bandgap frequencies. While multi-modal instability control of low-order modes can be achieved through the tuning of the resonant bandgaps, the densely packed modal cluster, regrouping modes featuring similar mode shapes, requires proper adjustment of the flame position for avoiding modal instability. Compared with the Bragg bandgaps, locally resonant bandgaps, which should be formed near the unstable modes even without stringent periodicity, are shown to play a decisive role in the control process. Meanwhile, strict periodicity is not necessary for the proposed control strategy, showing the practicability of the proposed control strategy. The study shows a promising route to achieve simultaneous suppression of multi-modal instability.

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Section: Numerical Results and Analyses A Mode Classification Inside ...mentioning

confidence: 99%

Section: Numerical Results and Analyses A Mode Classification Inside ...mentioning

confidence: 99%

Section: Model Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multi-modal thermoacoustic instability suppression via locally resonant and Bragg bandgaps

Liu

2022

The Journal of the Acoustical Society of America

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Entropy generation and CO2 emission in presence of pulsating oscillations in a bifurcating thermoacoustic combustor with a Helmholtz resonator at off-design conditions

Guan

Becker

Zhao

et al. 2023

Aerospace Science and Technology

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Effect of entropy waves on the thermoacoustic instability of choked outlet combustion chambers

Tang,

Du,

Liu

2024

Aerospace Science and Technology

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Thermoacoustic modal instability and its suppression with locally resonant flexible membranes

Cited by 5 publications

References 38 publications

Multi-modal thermoacoustic instability suppression via locally resonant and Bragg bandgaps

Multi-modal thermoacoustic instability suppression via locally resonant and Bragg bandgaps

Entropy generation and CO2 emission in presence of pulsating oscillations in a bifurcating thermoacoustic combustor with a Helmholtz resonator at off-design conditions

Effect of entropy waves on the thermoacoustic instability of choked outlet combustion chambers

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