Results 171 to 180 of about 124,231 (205)
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Actively passive control of thermoacoustic instability
The Journal of the Acoustical Society of America, 2017In 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, 2008There 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 +2 more
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Subcritical thermoacoustic instabilities in a premixed combustor
14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference), 2008Subcritical thermoacoustic instabilities are investigated in a premixed combustor test rig with a swirl-stabilized burner. Triggering of limit cycle oscillations from initially stable states as well as hysteresis in the variation of the preheat temperature and the air and gas mass flows is found. The stable fixed point and the stable limit cycle in the
Jonas Moeck +4 more
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Linear thermoacoustic instability in the time domain
The Journal of the Acoustical Society of America, 1998An 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 of lean disc flames
Fuel, 2016Abstract 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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Thermoacoustic Flow Instability in a Scramjet Combustor
41st AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2005*† ‡ § ¶ This paper deals with the thermoacoustic instability and ensuing flow oscillation in a scramjet engine, a phenomenon commonly known as combustion instability. The analysis is based on a quasi-one-dimensional treatment of unsteady flow motion, which simulates the main features of the oscillatory flowfields in both the isolator and combustor ...
Fuhua Ma +4 more
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Identification and active control of thermoacoustic instabilities
Proceedings of the 2001 IEEE International Conference on Control Applications (CCA'01) (Cat. No.01CH37204), 2002This paper presents an implementation of identification and acoustic control of thermoacoustic instabilities on a swirl-stabilized spray combustor. Loudspeakers located upstream of the burner were used as control actuators in the closed-loop system.
D.U. Campos-Delgado +3 more
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Low order modeling of thermoacoustic instabilities
2022Pollution and The Greenhouse Effect are a concern in our society. The high levels of CO2, NOx, ozone, and methane gasses are alarming and have pushed gas turbine industries to develop more environmentally friendly combustors. In the past years, Lean Premixed Combustors have been identified as a potential solution.
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