Results 151 to 160 of about 1,003 (200)
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Intrinsic thermoacoustic instabilities
Progress in Energy and Combustion Science, 2023Camilo F Silva
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Thermoacoustic Instabilities in an Annular Rijke Tube
Volume 2: Combustion, Fuels and Emissions, Parts A and B, 2010 Thermoacoustic instabilities are a major concern in the design of gas turbine combustors. Most modern combustion chambers have an annular shape with multiple circumferentially arranged burners and, accordingly, suffer often from azimuthal instability modes.
Jonas P. Moeck +2 more
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Effects of liquid fuel/wall interaction on thermoacoustic instabilities in swirling spray flames
Combustion and Flame, 2020 Euler-Lagrange Large Eddy Simulations of the effect of spray/wall interactions on thermoacoustic instabilities in swirling spray ...
Davide Laera +2 more
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Modelling of Thermoacoustic Combustion Instabilities Phenomena: Application to an Experimental Test Rig [PDF]
Energy Procedia, 2014 Lean premixed combustion chambers fuelled by natural gas and used in modern gas turbines for power generation are often affected by combustion instabilities generated by mutual interactions between pressure fluctuations and heat oscillations produced by ...
Davide Laera +2 more
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Thermoacoustic Instabilities in Counterflow Diffusion Flames [PDF]
, 2019 Thermoacoustic instabilities arise in combustion systems from a coupling between the unsteady heat release of the flame and the underlying acoustic field. Although thermoacoustics have been studied extensively with regards to premixed flames, where the fuel and oxidizer are fully mixed before combustion, the study of thermoacoustics in diffusion flames
Yao, Matthew X.
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Onset of flame-intrinsic thermoacoustic instabilities in partially premixed turbulent combustors
International Journal of Spray and Combustion Dynamics, 2018 We investigate the onset of thermoacoustic instabilities in a turbulent combustor terminated with an area contraction. Flow speed is varied in a swirl-stabilized, partially premixed combustor and the system is observed to undergo a dynamical transition ...
Meenatchidevi Murugesan +1 more
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Thermoacoustic instabilities: Modeling and control
IEEE Transactions on Control Systems Technology, 2003The goal of this study was twofold. First, modeling strategies were proposed to characterize the dynamics driving the thermoacoustic instabilities in a swirl-stabilized premixed burner. Second, this model was used to synthesize controllers in order to apply active control strategies to suppress this phenomenon.
Daniel U. Campos-Delgado +5 more
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Adaptive control for thermoacoustic combustion instabilities
Proceedings of the 2001 American Control Conference. (Cat. No.01CH37148), 2001Thermoacoustic instabilities in combustion processes involve pressure and velocity limit cycling oscillations that can have adverse effects on system performance. Using a nonlinear state space model for combustion processes that captures the coupling between unsteady combustion and acoustics, a direct adaptive control framework is used to design high ...
Natasa A. Kablar +2 more
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Thermoacoustic instability in solid media
The Journal of the Acoustical Society of America, 2018The exploration of thermoacoustic oscillations can be traced back to the 19th century when Sondhauss (1850) performed an experimental investigation that marked the birth of modern thermoacoustic research. Since then, several practical applications of the basic thermoacoustic effect were explored and ultimately led to the design of engineering devices ...
Haitian Hao +3 more
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Nonlinear saturation of the thermoacoustic instability
The Journal of the Acoustical Society of America, 2000A weakly nonlinear theory of the thermoacoustic instability in gas-filled tubes is developed in the time domain by exploiting the difference between the instability time scale and the period of standing waves. By carrying the expansion to fourth order in the perturbation parameter, explicit results for the initial growth, nonlinear evolution, and final
Karpov, S., Prosperetti, A.
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