Matteo Impagnatiello, Quentin Malé, Nicolas Noiray
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The results demonstrate that NRPDs initiate reacting kernels upstream of the second stage combustion chamber, which interact with the acoustic field and with the main flame brush, thereby significantly impacting the scattering matrix coefficients. An analysis of the system’s acoustic power amplification characteristics in absence of NRPDs underscores the system’s capability to amplify the incident acoustic power between 300 and 450 Hz, up to a maximum of +160%. This highlights the potential of the second stage to drive system destabilization. In contrast, with NRPDs, the system’s response is more balanced, with maximum amplification factor consistently below +25% across the entire spectrum. To shed light on this behavior, the relation between heat release rate and pressure fluctuations is examined at 327 Hz. As opposed to the main flame brush, plasma-induced kernels generate heat release fluctuations that are out-of-phase with the pressure fluctuations. Hence, NRPDs induce a drastic reduction in the component of the sequential stage heat release fluctuations that is coherent with the acoustic field and participates to the acoustic power amplification, thanks to the change in the flame morphology they induce.","PeriodicalId":408,"journal":{"name":"Proceedings of the Combustion Institute","volume":null,"pages":null},"PeriodicalIF":5.3000,"publicationDate":"2024-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Acoustic scattering of a sequential combustor controlled with non-equilibrium plasma: A numerical study\",\"authors\":\"Matteo Impagnatiello, Quentin Malé, Nicolas Noiray\",\"doi\":\"10.1016/j.proci.2024.105389\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"This study aims to investigate the impact of Nanosecond Repetitively Pulsed Discharges (NRPDs) on the acoustic scattering properties of the second stage of a Constant Pressure Sequential Combustor (CPSC). Despite the proven capability of NRPDs to stabilize such systems, a comprehensive understanding of the NRPDs-flame-acoustic interaction is lacking. To address this knowledge gap, Large Eddy Simulations (LESs) with state-of-the-art plasma modeling are combined with methods from system identification to characterize the system’s acoustic response both in the absence and presence of NRPDs. The results demonstrate that NRPDs initiate reacting kernels upstream of the second stage combustion chamber, which interact with the acoustic field and with the main flame brush, thereby significantly impacting the scattering matrix coefficients. An analysis of the system’s acoustic power amplification characteristics in absence of NRPDs underscores the system’s capability to amplify the incident acoustic power between 300 and 450 Hz, up to a maximum of +160%. This highlights the potential of the second stage to drive system destabilization. In contrast, with NRPDs, the system’s response is more balanced, with maximum amplification factor consistently below +25% across the entire spectrum. To shed light on this behavior, the relation between heat release rate and pressure fluctuations is examined at 327 Hz. As opposed to the main flame brush, plasma-induced kernels generate heat release fluctuations that are out-of-phase with the pressure fluctuations. 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Acoustic scattering of a sequential combustor controlled with non-equilibrium plasma: A numerical study
This study aims to investigate the impact of Nanosecond Repetitively Pulsed Discharges (NRPDs) on the acoustic scattering properties of the second stage of a Constant Pressure Sequential Combustor (CPSC). Despite the proven capability of NRPDs to stabilize such systems, a comprehensive understanding of the NRPDs-flame-acoustic interaction is lacking. To address this knowledge gap, Large Eddy Simulations (LESs) with state-of-the-art plasma modeling are combined with methods from system identification to characterize the system’s acoustic response both in the absence and presence of NRPDs. The results demonstrate that NRPDs initiate reacting kernels upstream of the second stage combustion chamber, which interact with the acoustic field and with the main flame brush, thereby significantly impacting the scattering matrix coefficients. An analysis of the system’s acoustic power amplification characteristics in absence of NRPDs underscores the system’s capability to amplify the incident acoustic power between 300 and 450 Hz, up to a maximum of +160%. This highlights the potential of the second stage to drive system destabilization. In contrast, with NRPDs, the system’s response is more balanced, with maximum amplification factor consistently below +25% across the entire spectrum. To shed light on this behavior, the relation between heat release rate and pressure fluctuations is examined at 327 Hz. As opposed to the main flame brush, plasma-induced kernels generate heat release fluctuations that are out-of-phase with the pressure fluctuations. Hence, NRPDs induce a drastic reduction in the component of the sequential stage heat release fluctuations that is coherent with the acoustic field and participates to the acoustic power amplification, thanks to the change in the flame morphology they induce.
期刊介绍:
The Proceedings of the Combustion Institute contains forefront contributions in fundamentals and applications of combustion science. For more than 50 years, the Combustion Institute has served as the peak international society for dissemination of scientific and technical research in the combustion field. In addition to author submissions, the Proceedings of the Combustion Institute includes the Institute''s prestigious invited strategic and topical reviews that represent indispensable resources for emergent research in the field. All papers are subjected to rigorous peer review.
Research papers and invited topical reviews; Reaction Kinetics; Soot, PAH, and other large molecules; Diagnostics; Laminar Flames; Turbulent Flames; Heterogeneous Combustion; Spray and Droplet Combustion; Detonations, Explosions & Supersonic Combustion; Fire Research; Stationary Combustion Systems; IC Engine and Gas Turbine Combustion; New Technology Concepts
The electronic version of Proceedings of the Combustion Institute contains supplemental material such as reaction mechanisms, illustrating movies, and other data.