Limits of achievable performance of controlled combustion processes

Banaszuk, Andrzej; Mehta, Prashant G.; Jacobson, C.A.; Khibnik, Alexander I.

doi:10.1109/tcst.2006.879980

Cited by 25 publications

(15 citation statements)

References 32 publications

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“…These principles explain peak-splitting phenomena that have been observed in several fl owcontrol settings, including combustion instabilities (Banaszuk et al, 2006b) and cavity oscillations . Here, one sees that the area of attenuation, for which log|S(iw)| < 0, is balanced by an equal area of amplifi cation, for which log|S(iw)| > 0.…”

Section: E Sensitivity Function and Fundamental Limitationsmentioning

confidence: 79%

“…This mechanism of oscillations in fl uids has been discovered in a variety of applications as well, including combustion instabilities (Banaszuk et al, 2006b), fl utter in turbomachinery (Rey et al, 2003), and cavity fl ows . If such a system is forced by noise, it can exhibit narrow-band oscillations as well, in much the same way that a tuning fork would continue to ring at a single frequency if it were continually forced at random frequencies.…”

Section: Characterizing Nonlinear Oscillationsmentioning

confidence: 90%

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Fundamentals and Applications of Modern Flow Control

Joslin¹,

Miller²,

Miller³

2009

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Section: E Sensitivity Function and Fundamental Limitationsmentioning

confidence: 79%

Section: Characterizing Nonlinear Oscillationsmentioning

confidence: 90%

Fundamentals and Applications of Modern Flow Control

Joslin¹,

Miller²,

Miller³

2009

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“…Lei et al 24 used perforated liner at various equivalence ratios and could achieve damping of the instability in the model test of a combustor. Various active control methods in closeloop form have been reported to suppress noisy combustion instabilities, which comprised of modulating the fuel flow rate, [25][26][27] air flow rate, 28,29 air-fuel mixing in pre-mixer, 30 and phase shift. [31][32][33][34] A review of the practical methods to implement feedback control techniques both on the laboratory scale and on largescale combustors is provided by Dowling and Morgans.…”

Section: Introductionmentioning

confidence: 99%

Experiments on heat content inside a Rijke tube with suppression of thermo-acoustics instability

Deshmukh

Sharma

2016

International Journal of Spray and Combustion Dynamics

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The present work describes the occurrence of thermo-acoustic instability inside a horizontal Rijke tube and its suppression using an open loop active control technique. The Rijke tube is provided with a co-axial pre-mixed gas burner as the source of heat, which could be placed at any desired position. Radial injection of air (less than 3% of the total mass flow) through micro-jets into the flame is used as a control technique to suppress the thermo-acoustic instability. The rise in heat content inside the Rijke tube, estimated from the temperature mapping, clearly shows reduction in the heat loss as a result of complete suppression of the thermo-acoustic instability. However, the stability achieved passively by means of a slight shift in the burner position does not result in any change in the heat content. There is a visible change in the appearance of the burner flame when the above two methods are used to suppress the thermo-acoustic instability. The flame is seen to significantly shrink in length and spread radially when the control technique was applied. The flame dynamics is believed to determine the heat loss and hence the heat content inside the Rijke tube.

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“…The fundamental limitations of the ACCS, including the feedback delay issue were noted in [3] using frequency domain reasoning that was focused on a specific example and characterized the nonlinearities through a describing function. This paper shows that the limitations exist in a simple averaged dynamics model with just two states.…”

Section: Introductionmentioning

confidence: 99%

Amplitude and phase control in active suppression of combustion instability

Gorinevsky

Overman²,

Goeke³

2012

2012 American Control Conference (ACC)

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Abstract-This paper provides stability analysis for phase shifting active combustion control system where modulation of the fuel flow is used to suppress thermo-acoustic instability. The analysis is based on Krylov-Bogolubov averaged model for the oscillations with the external periodic forcing. The amplitude dynamics and phase dynamics are described by nonlinear first order models. The control inputs are the amplitude and phase of forcing (fuel modulation). The analysis demonstrates that phase dynamics and amplitude dynamics are each unstable in the desired target regime. Practical stabilizing control approaches and their limitations in the presence of feedback delays are discussed and analyzed. The analysis in this paper is verified in detailed simulations and validated in experiments with a jet engine scale combustor rig.

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Limits of achievable performance of controlled combustion processes

Cited by 25 publications

References 32 publications

Fundamentals and Applications of Modern Flow Control

Fundamentals and Applications of Modern Flow Control

Experiments on heat content inside a Rijke tube with suppression of thermo-acoustics instability

Amplitude and phase control in active suppression of combustion instability

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