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- W4294875219 abstract "Abstract This paper presents the investigation of high-frequency thermoacoustic driving mechanisms in gas turbine reheat combustion systems. Reheat flames are stabilised by both autoignition and propagation and, as a result, additional thermoacoustic driving mechanisms are present compared with more conventional swirl-stabilised combustors. Two self-excited thermoacoustic modes have been observed in a 1 MW reheat test rig at atmospheric pressure. One of these modes is intermittently unstable, while the other mode exhibits high-amplitude limit-cycle behaviour. The underlying driving mechanisms of each individual mode have been investigated separately in previous works and, in this paper, the two modes are directly compared to understand why these instabilities are each associated with different driving phenomena. It is shown that, due to the different flame regimes present in the reheat combustor, the potential for flame-acoustic coupling is highly dependent on the thermoacoustic mode shape. Different interactions between the reheat flame and acoustics are possible depending on the orientation of the acoustic pressure nodes and antinodes relative to the autoignition- and propagation-stabilised flame regions, with the strongest coupling occurring when a pressure antinode is located close to the autoignition zone. This provides insight into the significance of the different driving mechanisms and contributes to the ongoing development of models to allow prediction and mitigation of thermoacoustic instabilities in reheat combustion systems, which are crucial for reliable combustor designs in the future." @default.
- W4294875219 created "2022-09-07" @default.
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- W4294875219 date "2022-09-07" @default.
- W4294875219 modified "2023-10-02" @default.
- W4294875219 title "High-Frequency Mode Shape Dependent Flame-Acoustic Interactions in Reheat Flames" @default.
- W4294875219 doi "https://doi.org/10.1115/1.4055531" @default.
- W4294875219 hasPublicationYear "2022" @default.
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