Results 171 to 180 of about 2,865 (193)

Intrinsic thermoacoustic instability of premixed flames

Combustion and Flame, 2015
Abstract The thermoacoustic stability of velocity sensitive premixed flames is investigated. A causal representation of the flow-flame-acoustic interactions reveals a flame-intrinsic feedback mechanism. The feedback loop may be described as follows: An upstream velocity disturbance induces a modulation of the heat release rate, which in turn ...
Thomas Emmert, Sebastian Bomberg, Wolfgang Polifke   +2 more
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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 Instabilities in Solid Rocket Motors

45th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2009
This work describes an unreported instability in so lid rocket motors found out by numerical simulations. A detailed numerical study s hows that this instability is thermoacoustic and results from a coupling between acoustic velocity and aluminum combustion heat release.
Stany Gallier, Emmanuel Radenac, Franck Godfroy   +2 more
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Thermoacoustic Instability in Two-Dimensional Fluid Complex Plasmas

Physical Review Letters, 2018
Thermoacoustic instability in a fluid monolayer complex plasma is studied for the first time. Experiments, theory, and simulations demonstrate that nonreciprocal effective interactions between particles (mediated by plasma flows) provide positive thermal feedback leading to acoustic sound amplification.
Kryuchkov, Nikita, Yakovlev, Egor, Gorbunov, Evgeny, Couëdel, Lénaïc, Lipaev, Andrey, Yurchenko, Stanislav   +5 more
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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 Instability

2021
R. I. Sujith, Samadhan A. Pawar
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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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Time-Averaged Gradient Control of Thermoacoustic Instabilities

Journal of Propulsion and Power, 2003
Active control of thermoacoustic instabilities has been an important topic of research for many years. In particular, adaptive-control approaches are continually investigated because of their potential ability to adjust to changing and unknown operating conditions. Most adaptive controllers are model based and require accurate knowledge of the plant to
Michael A. Vaudrey, William T. Baumann, William R. Saunders   +2 more
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Linear thermoacoustic instability in the time domain

The Journal of the Acoustical Society of America, 1998
An approximate time-domain description of the development of the thermoacoustic instability in gas-filled tubes is developed by exploiting the difference between the instability time scale and the period of standing waves. The perturbation results compare very favorably with the exact frequency-domain theory of Rott.
S. Karpov, A. Prosperetti
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Thermoacoustic Instabilities in Counterflow Diffusion Flames

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
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