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Keywords: thermoacoustics
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Proceedings Papers

Proc. ASME. GT2023, Volume 3B: Combustion, Fuels, and Emissions, V03BT04A010, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-102853
... with elliptic reacting jets in cross-flow is examined, operating under lean-premixed conditions at elevated pressure and exhibiting high-frequency transverse mode shapes. It can be seen that depending on the orientation of the elliptical shape of the jet to the crossflow, thermoacoustic modes can be suppressed...
Proceedings Papers

Proc. ASME. GT2023, Volume 3A: Combustion, Fuels, and Emissions, V03AT04A032, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-101500
... Abstract Knowledge of flame responses to acoustic perturbations is of utmost importance to predict thermoacoustic instabilities in gas turbine combustors. However, measuring transfer functions linking acoustic quantities upstream and downstream of flames is very challenging in practical systems...
Proceedings Papers

Proc. ASME. GT2023, Volume 3A: Combustion, Fuels, and Emissions, V03AT04A028, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-101460
... extrapolate the heat release rate field in physical space beyond the observed window in the experiments, and in parameter space to smaller perturbation amplitudes. We then convert the periodic heat release rate field into a distributed n-τ model, which we enter into a thermoacoustic Helmholtz solver. We find...
Proceedings Papers

Proc. ASME. GT2023, Volume 3A: Combustion, Fuels, and Emissions, V03AT04A069, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-102543
.... The MLP-CAE provides a building block towards a potential shift away from a purely 0D analysis with the assumption of acoustic compactness of the flame. When combined with an acoustic network, the generated flame fields could provide more physical insight in the thermoacoustic dynamics of combustion...
Proceedings Papers

Proc. ASME. GT2022, Volume 2: Coal, Biomass, Hydrogen, and Alternative Fuels; Controls, Diagnostics, and Instrumentation; Steam Turbine, V002T05A001, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-80650
... Abstract Thermoacoustic instabilities have plagued the operation of gas turbine engines for years and significant research is being conducted in detecting and understanding them. In this paper, an output only identification technique is employed for a noise induced dynamical system representing...
Proceedings Papers

Proc. ASME. GT2022, Volume 3A: Combustion, Fuels, and Emissions, V03AT04A023, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-80725
... Abstract Thermoacoustic instabilities in annular or circular combustors are often coupled with azimuthal modes. These modes can be characterized by a spin ratio, which quantifies the dominant mode between two counter-rotating waves, and a phase difference between them, which is directly related...
Proceedings Papers

Proc. ASME. GT2021, Volume 3A: Combustion, Fuels, and Emissions, V03AT04A022, June 7–11, 2021
Publisher: American Society of Mechanical Engineers
Paper No: GT2021-58862
... at very high pressure. In this context, thermoacoustic instabilities may occur within the combustion chamber. The unsteady heat released by the flame generates pressure waves, which are coupled to the inlet air velocity by a feedback loop. This loop amplifies the instabilities of the inlet air velocity...
Proceedings Papers

Proc. ASME. GT2021, Volume 3A: Combustion, Fuels, and Emissions, V03AT04A037, June 7–11, 2021
Publisher: American Society of Mechanical Engineers
Paper No: GT2021-59098
... Proceedings of ASME Turbo Expo 2021 Turbomachinery Technical Conference and Exposition GT2021 June 7-11, 2021, Virtual, Online GT2021-59098 EXPERIMENTAL INVESTIGATION OF FUEL STAGING EFFECT ON MODAL DYNAMICS OF THERMOACOUSTIC AZIMUTHAL INSTABILITIES IN A MULTI-NOZZLE CAN COMBUSTOR J. Kim, W...
Proceedings Papers

Proc. ASME. GT2021, Volume 4: Controls, Diagnostics, and Instrumentation; Cycle Innovations; Cycle Innovations: Energy Storage; Education; Electric Power, V004T07A003, June 7–11, 2021
Publisher: American Society of Mechanical Engineers
Paper No: GT2021-59688
... Abstract Thermoacoustics (TA) engines and refrigerators typically run on the Stirling cycle with acoustic networks and resonators replacing the physical pistons. Without moving parts, these TA machines achieve a reasonable fraction of Carnot’s efficiency. They are also scalable, from fractions...
Proceedings Papers

Proc. ASME. GT2021, Volume 4: Controls, Diagnostics, and Instrumentation; Cycle Innovations; Cycle Innovations: Energy Storage; Education; Electric Power, V004T09A006, June 7–11, 2021
Publisher: American Society of Mechanical Engineers
Paper No: GT2021-59317
... Abstract Understanding thermoacoustic instabilities is essential for the reliable operation of gas turbine engines. To complicate this understanding, the extreme sensitivity of gas turbine combustors can lead to instability characteristics that differ across a fleet. The capability to monitor...
Proceedings Papers

Proc. ASME. GT2021, Volume 6: Ceramics and Ceramic Composites; Coal, Biomass, Hydrogen, and Alternative Fuels; Microturbines, Turbochargers, and Small Turbomachines, V006T03A013, June 7–11, 2021
Publisher: American Society of Mechanical Engineers
Paper No: GT2021-59844
... Proceedings of ASME Turbo Expo 2021 Turbomachinery Technical Conference and Exposition GT2021 June 7-11, 2021, Virtual, Online GT2021-59844 THERMOACOUSTIC BEHAVIOUR OF A HYDROGEN MICROMIX AVIATION GAS TURBINE COMBUSTOR UNDER TYPICAL FLIGHT CONDITIONS David Abbott*1, Alessandro Giannotta1, Xiaoxiao...
Proceedings Papers

Proc. ASME. GT2012, Volume 2: Combustion, Fuels and Emissions, Parts A and B, 479-490, June 11–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: GT2012-68698
... The adoption of lean premixed prevaporised combustion systems can reduce NO x emissions from gas turbines, but unfortunately also increases their susceptibility to thermoacoustic instabilities. Initially, acoustic waves can produce heat release fluctuations by a variety of mechanisms, often...
Proceedings Papers

Proc. ASME. GT2011, Volume 2: Combustion, Fuels and Emissions, Parts A and B, 259-268, June 6–10, 2011
Publisher: American Society of Mechanical Engineers
Paper No: GT2011-45246
... 07 05 2012 Intense research on the thermoacoustic stability of premixed gas turbine combustors in the past two decades has led to an improved understanding of instabilities of longitudinal modes in the sub-kHz range and predictive tools for thermoacoustic stability analysis have also...
Proceedings Papers

Proc. ASME. GT2011, Volume 2: Combustion, Fuels and Emissions, Parts A and B, 277-288, June 6–10, 2011
Publisher: American Society of Mechanical Engineers
Paper No: GT2011-45255
... for developing control strategies. Combustion Instabilities G-Equation Thermoacoustics Gas Turbines Premixed Flames Proceedings of The ASME Turbo Expo ASME2011 June 06-11, 2011, Vancouver, Canada GT2011-45255 LOW-ORDER MODELLING OF DUCTED FLAMES WITH TEMPORALLY VARYING EQUIVALENCE RATIO IN REALISTIC...
Proceedings Papers

Proc. ASME. GT2011, Volume 2: Combustion, Fuels and Emissions, Parts A and B, 1205-1215, June 6–10, 2011
Publisher: American Society of Mechanical Engineers
Paper No: GT2011-46503
... an unstable thermoacoustic mode is inherently nonlinear, a comprehensive explanation for success (or failure) of open-loop control has not been found. The present work contributes to the understanding of this process in that it interprets open-loop forcing at non-resonant frequencies in terms of the flame’s...
Proceedings Papers

Proc. ASME. GT2008, Volume 3: Combustion, Fuels and Emissions, Parts A and B, 527-538, June 9–13, 2008
Publisher: American Society of Mechanical Engineers
Paper No: GT2008-50755
... 04 08 2009 Evaluation of thermoacoustic properties of gas turbine combustion systems during the design phase is crucial to meet time to market requirements for advanced new gas turbines. During the design phase the impact of design changes on engine performance need to be assessed...
Proceedings Papers

Proc. ASME. GT2007, Volume 2: Turbo Expo 2007, 607-617, May 14–17, 2007
Publisher: American Society of Mechanical Engineers
Paper No: GT2007-27796
... 10 03 2009 In early design phases new burner concepts are mostly tested in single or multi burner test rigs. These test rigs generally exhibit a different acoustic behavior than the full scale engine. The acoustic behavior, however, is crucial to predict whether thermoacoustic...
Proceedings Papers

Proc. ASME. GT2006, Volume 1: Combustion and Fuels, Education, 639-647, May 8–11, 2006
Publisher: American Society of Mechanical Engineers
Paper No: GT2006-90875
... cooling were combined with a reduced chemical scheme that predicts NOx emissions. Good agreement of the calculated flame position and shape with experimental data was found. gas turbine combustor laser diagnostics thermoacoustics numerical simulation 1 Copyright © 2006 by ASME flame position...