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http://hdl.handle.net/10397/95527
Title: | Thermoacoustic modal instability and its suppression with locally resonant flexible membranes | Authors: | Liu, Y Du, J Cheng, L |
Issue Date: | Mar-2022 | Source: | Combustion and flame, Mar. 2022, v. 237, 111859 | Abstract: | Thermoacoustic oscillation and instability are a common occurrence in many industrial problems. Investigations on the interplay among different types of modes, their evolution process and coupling with add-on control devices are of vital importance to guide the development of proper control strategies. Using a linear heat release n-τ model inside a duct, these issues are investigated in this paper based on a fully coupled energy-based model. Studies allow the classification and quantification of different types of eigen-modes, as well as their stability and controllability features. Using flush-mounted flexible membranes over the duct wall, possible suppressions of unstable modes and the underlying control mechanisms are revealed with particular focus on cases involving small time delay and interaction indices. Numerical analyses show that thermoacoustic instability of the system can be controlled via creating strong vibro-acoustic coupling, via two different physical processes for acoustic and intrinsic modes. For the former, the acoustic modal pressure distribution should be positively altered in the vicinity of the heat source to create a favorable pressure state scenario, in agreement with Rayleigh criterion. For the latter, control is achieved indirectly through a proper alteration of the nearby acoustic modes, thus affecting their coupling with the targeted intrinsic mode. In both cases, a successful suppression of the thermoacoustic modal instability can be materialized through a proper adjustment of the physical parameters of the membranes and their installation locations. | Keywords: | Intrinsic mode Modal instability control N-τ model Thermoacoustic oscillation |
Publisher: | Elsevier | Journal: | Combustion and flame | ISSN: | 0010-2180 | DOI: | 10.1016/j.combustflame.2021.111859 | Rights: | © 2021 The Combustion Institute. Published by Elsevier Inc. All rights reserved. © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Liu, Y., Du, J., & Cheng, L. (2022). Thermoacoustic modal instability and its suppression with locally resonant flexible membranes. Combustion and Flame, 237, 111859 is available at https://dx.doi.org/10.1016/j.combustflame.2021.111859. |
Appears in Collections: | Journal/Magazine Article |
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Liu_Thermoacoustic_Modal_Instability.pdf | Pre-Published version | 1.68 MB | Adobe PDF | View/Open |
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