Plasma assisted thermoacoustic stabilization of a transiently operated sequential combustor at high pressure
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Date
2024
Publication Type
Journal Article
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Abstract
This study demonstrates the stabilization of a thermoacoustic instability in a sequential combustor at elevated pressure conditions using Nanosecond Repetitively Pulsed Discharges (NRPD). Sequential combustors operating at constant pressure offer several advantages over their conventional counterparts, including increased fuel flexibility and a wider operating range. In this work, we investigate the control of thermoacoustic instabilities with NRPD up to 6 bar, in both stationary and transient modes of operation. Two types of transient scenarios are considered. In the first transient scenario, the combustor pressure is linearly increased from 4 to 5 bar, which corresponds to an increase of the overall thermal power from 273 kW to 341 kW, while continuously employing NRPD to ensure the thermoacoustic stabilization of the system. In the second transient case, the tunable outlet orifice of the sequential combustor at a pressure level of 5 bar is progressively swept such that the area ratio between the orifice and the combustion chamber cross-section ranges from 0.75 to 0.82. In both cases, the NRPD shows remarkable performance in suppressing the thermoacoustic instability at ultra-low plasma power compared to the combustor thermal power, down to about 1×10−2%. This achievement opens the way for further developments toward commercial application of NRPD-based plasma assisted combustion in sequential combustors.
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published
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Volume
40 (1-4)
Pages / Article No.
105518
Publisher
Elsevier
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Subject
Thermoacoustics; Active control; Sequential combustion; Plasma-assisted combustion
Organisational unit
09471 - Noiray, Nicolas / Noiray, Nicolas
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Funding
820091 - ThermoacOustic instabilities contRol in sequential Combustion cHambers (EC)