Results 161 to 170 of about 2,929 (210)

Nonlinear saturation of thermoacoustic instability

The Journal of the Acoustical Society of America, 1999
In earlier work [Watanabe et al., J. Acoust. Soc. Am. 102, 3484–3496 (1997)] a quasi-one-dimensional nonlinear model for thermoacoustic devices was developed. The model reduces exactly to the well-known Rott theory upon linearization, but numerical work has shown that it is also able to predict nonlinear features in agreement with experiment.
Sergey Karpov, Andrea Prosperetti
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Thermoacoustic Sources and Instabilities

1992
Thermoacoustics deals with the acoustics of flows in which the variation of entropy plays a significant role. A range of processes are thermoacoustic sources. For example, unsteady combustion, diffusion of heat and mass and turbulent two-phase flows all generate sound.
D. G. Crighton, A. P. Dowling, J. E. Ffowcs Williams, M. Heckl, F. G. Leppington   +4 more
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Hybrid Control for Thermoacoustic Instabilities

Dynamic Systems and Control: Volume 1, 2000
Abstract The complex interactions between acoustics and unsteady combustion is the driving energy mechanism for transmuting self-excited pressure and velocity oscillations in combustion systems. These oscillations, known as thermoacoustic instabilities, can have adverse effects on system performance.
Wassim M. Haddad, VijaySekhar Chellaboina, Nataša A. Kablar   +2 more
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Identification of a model for thermoacoustic instabilities in a Rijke tube

IEEE Transactions on Control Systems Technology, 2002
In a large class of processes characterized by the presence of a heating source placed in a finite volume, the interaction between the flow field and the heat release mechanism can lead to unsteady fluctuations, known as thermoacoustic instabilities.
Sergio Bittanti, Antonio De Marco, Guido Poncia, Walter Prandoni   +3 more
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Model refinement for the active control of thermoacoustic instability

IEEE Conference on Decision and Control and European Control Conference, 2011
Active control has been shown as a feasible technology for suppressing thermoacoustic instability in continuous combustion systems, and the control strategy design is substantially dependent on the reliability of the flame model. In this paper, refinement of G-equation flame model for the dynamics of lean premixed combustion is investigated. Precisely,
Xiaochuan Yuan, Keith Glover
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Thermoacoustic instability of a plasma

Soviet Physics Journal, 1988
The possibility of the onset of a self-excited instability in a high-temperature plasma as a result of energy released in thermonuclear interactions between ions is discussed, and the resulting instability conditions are used to investigate the behavior of a linear pinch.
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Thermoacoustic Instability in Solid Rocket Motor: Non-Normality and Nonlinear Instabilities

48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, 2010
An analytical framework is developed to understand and predict the thermoacoustic instability in solid rocket motors, taking into account the non-orthogonality of the eigenmodes of the unsteady coupled system. The coupled system comprises the dynamics of the acoustic field and the propellant burn rate.
Mariappan, Sathesh, Sujith, R. I.
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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, Markus Paul, Christian Oliver Paschereit   +2 more
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Actively passive control of thermoacoustic instability

The Journal of the Acoustical Society of America, 2017
In this work, experimental studies of actively passive control of perforated liner with a bias flow on mitigating thermoacoustic instability are performed. For this, a well-designed Rijke-type thermoacoustic combustor with a perforated liner implemented is designed. A premixed propane-fueled flame is confined in the bottom half.
Dan Zhao, Ashique Akram Tarique, Shen Li
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Impact of Linear Coupling on Thermoacoustic Instabilities

Combustion Science and Technology, 2008
There have been conflicting opinions in literature, about the consequences of ignoring the linear coupling terms in finite-dimensional thermoacoustic models. We try to clarify this issue in this paper. We study consequences of ignoring the linear coupling terms on the non-normal thermoacoustic interactions in a horizontal Rijke tube.
K. S. Kedia, S. B. Nagaraja, R. I. Sujith   +2 more
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