Results 131 to 140 of about 3,434 (176)

Thermoacoustic Instability in a Rijke Tube: Non-Normality and Nonlinearity

13th AIAA/CEAS Aeroacoustics Conference (28th AIAA Aeroacoustics Conference), 2007
The role of non-normality and nonlinearity in thermoacoustic interaction in a Rijke tube is investigated in this paper. The heat release rate of the heating element is modeled by a modified form of King’s law. This fluctuating heat release from the heating element is treated as a compact source in the one-dimensional linear model of the acoustic field.
Balasubramanian, Koushik, Sujith, R. I.
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The Rijke tube — A thermo-acoustic device

Resonance, 2003
The Rijke tube is simply a cylindrical tube with both ends openand a heat source placed inside it. The heat source may be aflame or an electrical heating element. Traditionally, the tube ispositioned vertically on a stand (or even in your hand) and theheat source is introduced from below into the tube (
Shekhar M Sarpotdar, N Ananthkrishnan, S D Sharma   +2 more
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Modeling of Unstable Regimes in a Rijke Tube

5th International Symposium on Fluid Structure Interaction, Aeroelasticity, and Flow Induced Vibration and Noise, 2002
In the ducts with mean flows and heat sources, excitation of acoustic eigen modes is possible when unsteady heat release is coupled with pressure perturbations. The simplest device for studying the fundamental principles of thermoacoustic instabilities in the presence of a mean flow is a Rijke tube.
K. I. Matveev, F. E. C. Culick
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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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Electroacoustic control of Rijke tube instability

Journal of Sound and Vibration, 2017
Abstract Unsteady heat release coupled with pressure fluctuation triggers the thermoacoustic instability which may damage a combustion chamber severely. This study demonstrates an electroacoustic control approach of suppressing the thermoacoustic instability in a Rijke tube by altering the wall boundary condition.
Yumin Zhang, Lixi Huang
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One-dimensional model for the Rijke tube

Journal of Fluid Mechanics, 1989
We develop a simple model in which longitudinal, compressible, unsteady heat transfer between heater and gas is computed in the small-Mach-number limit. This calculation is used to determine the transfer function of the heater, which plays an important role in the stability limits of the thermoacoustic instability of the Rijke tube.
Nicoli, C., Pelcé, P.
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Active control of the noise from a rijke tube

Journal of Sound and Vibration, 1986
Instabilities caused by flames or other heat sources in resonators can be suppressed with a feedback system. It consists of a microphone inside the resonator, a phase-shifter, an amplifier and a loudspeaker at one end of the resonator. The pressure field produced by the loudspeaker changes the boundary conditions at the end of the resonator.
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The Rijke tube as an initial value problem

3rd AIAA/CEAS Aeroacoustics Conference, 1997
The extension of Computational Aeroacoustics (CAA) techniques to the study of thermoacoustic oscillations requires careful consideration of the fundamental mechanisms and validation of the approach when possible. A straightforward example of a system in which thermoacoustic oscillations may arise is provided by the Rijke tube.
Douglas Nark, Jay Hardin, Douglas Nark, Jay Hardin   +3 more
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Nonlinear feedback control of thermoacoustic oscillations in a Rijke tube

2014 IEEE 23rd International Symposium on Industrial Electronics (ISIE), 2014
Flow disturbances could undergo transient growth to trigger thermoacoustic instability in a combustion system with non-orthogonal eigenmodes. In this work, nonlinear feedback control of thermoacoustic oscillations in a Rijke-type combustion system is considered. A generalized thermoacoustic model with distributed monopole-like actuators is proposed. To
Jaime Rubio Hervas, Dan Zhao, Mahmut Reyhanoglu   +2 more
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Control laboratory experiments in thermoacoustics using the Rijke tube

2014 American Control Conference, 2014
We report on experiments that investigate the dynamics, identification and control of thermoacoustic phenomena in a Rijke tube apparatus. These experiments are relatively simple to construct and conduct in a typical, well-equipped undergraduate controls laboratory, yet allow for the exploration of rich and coupled acoustic and thermal dynamics, the ...
Jonathan P. Epperlein, Bassam Bamieh, Karl Johan Åström   +2 more
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