Results 161 to 170 of about 2,865 (193)

A Comprehensive Review on Filled Carbon Nanotubes: Synthesis, Properties and Applications. [PDF]

Chem Rev
Sandoval S, Gonçalves G, Pérez Barrio J, Kharlamova MV, Tobías-Rossell G.   +4 more
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Thermoacoustic instability in solid media

The Journal of the Acoustical Society of America, 2018
The 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, Carlo Scalo, Mihir Sen, Fabio Semperlotti   +3 more
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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 instabilities: Modeling and control

IEEE Transactions on Control Systems Technology, 2003
The 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.
D.U. Campos-Delgado, B.B.H. Schuermans, K. Zhou, C.O. Paschereit, E.A. Gallestey, A. Poncet   +5 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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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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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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Adaptive control for thermoacoustic combustion instabilities

Proceedings of the 2001 American Control Conference. (Cat. No.01CH37148), 2001
Thermoacoustic 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 ...
N.A. Kablar, T. Hayakawa, W.M. Haddad
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Thermoacoustic instabilities of lean disc flames

Fuel, 2016
Abstract The present work evaluates impinging lean disc flames, stabilized on a Helmholtz resonator, under thermoacoustic oscillations. These unsteady flames were found to oscillate with either one single frequency ( f ) or two simultaneous frequencies ( f , 2 f ).
B.F.C. Cintra, E.C. Fernandes
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Nonlinear saturation of the thermoacoustic instability

The Journal of the Acoustical Society of America, 2000
A 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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