Three-step approach for prediction of limit cycle pressure oscillations in combustion chambers of gas turbines

Iurashev, Dmytro; Campa, Giovanni; Anisimov, Viatcheslav V.; Cosatto, Ezio

doi:10.1080/13647830.2017.1349343

Cited by 7 publications

(9 citation statements)

References 32 publications

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“…½T ðxÞ À T k ðxÞ 2 dx (6) in the frequency range ½0; x max , where x max is taken as the maximum angular frequency for which the FTF data are available. In practice, FTFs tend to decay strongly beyond a certain cut-off frequency (low-pass filter), and often FTF data are available for the whole frequency range of interest, i.e.…”

Section: Methods To Determine the Coupling Coefficientsmentioning

confidence: 99%

“…However, the physical interpretation of this time-domain function is not obvious. Some authors regard it as an ‘amplitude-dependent impulse response’, 6 , 10 but this is misleading. In fact, this time-domain function is not an amplitude-dependent IR, if one takes the literal meaning: the response to an impulse with a given peak value (amplitude).…”

Section: Introductionmentioning

confidence: 99%

“…Iurashev et al. 6 extended the approach by Komarek and Polifke 21 into the nonlinear domain. Their FDF data came from CFD simulations and comprised a total of 16 data points (four excitation frequencies with four excitation amplitudes).…”

Section: Introductionmentioning

confidence: 99%

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Analytical approximations for heat release rate laws in the time- and frequency-domains

Gopinathan

Bigongiari

Heckl

2020

International Journal of Spray and Combustion Dynamics

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This paper focusses on the relationship between the heat release rate and the acoustic field, which is a crucial element in modelling thermoacoustic instabilities. The aim of the paper is twofold. The first aim is to develop a transformation tool, which makes it easy to switch between the time-domain representation (typically a heat release law involving time-lags) and the frequency-domain representation (typically a flame transfer function) of this relationship. Both representations are characterised by the same set of parameters n1, n2, …, nk. Their number is quite small, and they have a clear physical meaning: they are time-lag dependent coupling coefficients. They are closely linked to the impulse response of the flame in the linear regime in that they are proportional to the discretised (with respect to time) impulse response. In the nonlinear regime, the parameters n1, n2, …, nk become amplitude-dependent. Their interpretation as time-lag dependent coupling coefficients prevails; however, the link with the impulse response is lost. Nonlinear flames are commonly described in the frequency-domain by an amplitude-dependent flame transfer function, the so-called flame describing function. The time-domain equivalent of the flame describing function is sometimes mistaken for a ‘nonlinear impulse response’, but this is not correct. The second aim of this paper is to highlight this misconception and to provide the correct interpretation of the time-domain equivalent of the flame describing function.

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Section: Methods To Determine the Coupling Coefficientsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analytical approximations for heat release rate laws in the time- and frequency-domains

Gopinathan

Bigongiari

Heckl

2020

International Journal of Spray and Combustion Dynamics

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“…Simulations with more elaborate flame models (three time-lags, rather than just a single time-lag; amplitude-dependent FTF) were performed in Iurashev et al. 33 Parameter studies again gave clear evidence for the presence of an unstable ITA mode: its frequency was almost independent of the temperature in the combustion chamber.…”

Section: Intrinsic Thermoacoustic Modesmentioning

confidence: 99%

“…This analytical FDF was subsequently used successfully 33 in a stability analysis of the BRS burner, which was modelled as a low-order network. Limit cycle amplitudes and frequencies were predicted for various combustion chamber lengths.…”

Section: Application To a Laboratory Test Rig With A Swirl Flamementioning

confidence: 99%

Advances by the Marie Curie project TANGO in thermoacoustics

Heckl

2019

International Journal of Spray and Combustion Dynamics

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This paper gives an overview of the research performed by the project TANGO-an Initial Training Network (ITN) with an international consortium of seven academic and five industrial partners. TANGO is the acronym for 'Thermoacoustic and Aeroacoustic Nonlinearities in Green combustors with Orifice structures'). The researchers in TANGO studied many of the intricate physical processes that are involved in thermoacoustic instabilities. The paper is structured in such a way that each section describes a topic investigated by one or more researchers. The topics include:

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Modeling and analysis of premixed flame dynamics by means of distributed time delays

Polifke

2020

Progress in Energy and Combustion Science

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Three-step approach for prediction of limit cycle pressure oscillations in combustion chambers of gas turbines

Cited by 7 publications

References 32 publications

Analytical approximations for heat release rate laws in the time- and frequency-domains

Analytical approximations for heat release rate laws in the time- and frequency-domains

Advances by the Marie Curie project TANGO in thermoacoustics

Modeling and analysis of premixed flame dynamics by means of distributed time delays

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