Prediction of Stability Limits for Lp and LPP Gas Turbine Combustors

Lohrmann, Martin; Büchner, H.

doi:10.1080/00102200500241040

Cited by 20 publications

(26 citation statements)

References 12 publications

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“…For example, Lean Premixed Prevaporized (LPP) systems are being developed (Lohrmann and Buechner, 2005;Sommerer et al, 2004) to take advantage of the lean combustion regime in terms of pollutants production, especially nitrogen dioxide (Lefebvre, 1999). However, LPP burners are likely to be subject to combustion instabilities (Lieuwen and Yang, 2005;Poinsot and Veynante, 2005), which consist in an unfavorable coupling between acoustics and combustion.…”

Section: Introduction and Objectivesmentioning

confidence: 99%

Acoustic modeling of perforated plates with bias flow for Large-Eddy Simulations

Mendez

Eldredge

2009

Journal of Computational Physics

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The study of the acoustic effect of perforated plates by Large-Eddy Simulations is reported. The ability of compressible Large-Eddy Simulations to provide data on the flow around a perforated plate and the associated acoustic damping is demonstrated. In particular, assumptions of existing models of the acoustic effect of perforated plate are assessed thanks to the Large-Eddy Simulations results. The question of modeling the effect of perforated plates is then addressed in the context of thermoacoustic instabilities of gas turbine combustion chambers. Details are provided about the implementation, validation and application of a homogeneous boundary condition modeling the acoustic effect of perforated plates for compressible Large-Eddy Simulations of the flow in combustions chambers cooled by full-coverage film cooling.

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Section: Introduction and Objectivesmentioning

confidence: 99%

Acoustic modeling of perforated plates with bias flow for Large-Eddy Simulations

Mendez

Eldredge

2009

Journal of Computational Physics

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“…As a consequence, the delay of the flame transfer function (FTF) decreases. Lohrmann and Buechner [13] also observed a diminution of the delay of the flame response at higher preheat temperatures and a strong impact of the preheat temperature on the amplitude response of the flame. They explain the smaller delay with an increase of the turbulent flame speed at higher preheat temperatures, which moves the main reaction zone closer to the nozzle outlet.…”

Section: Introductionmentioning

confidence: 92%

“…However, to the first order, the response of such a flame is related to its length and position (e.g., see Refs. [13,41]). Consequently, the fact that the instability frequency is well predicted provides an indirect validation of the computed flame shape and position: the frequency of the unstable mode is mainly imposed by the geometry and the sound speed field; with an incorrect delay in the LES, no instability would be observed at this frequency.…”

Section: Unstable Mode and Flame Characteristicsmentioning

confidence: 99%

Influence of Heat Transfer and Material Temperature on Combustion Instabilities in a Swirl Burner

Kraus

Selle

Poinsot

et al. 2016

Volume 4A: Combustion, Fuels and Emissions

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 17948 The current work focuses on the large eddy simulation (LES) of combustion instability in a laboratory-scale swirl burner. Air and fuel are injected at ambient conditions. Heat conduction from the combustion chamber to the plenums results in a preheating of the air and fuel flows above ambient conditions. The paper compares two computations: In the first computation, the temperature of the injected reactants is 300 K (equivalent to the experiment) and the combustor walls are treated as adiabatic. The frequency of the unstable mode (% 635 Hz) deviates significantly from the measured frequency (% 750 Hz).In the second computation, the preheating effect observed in the experiment and the heat losses at the combustion chamber walls are taken into account. The frequency (% 725 Hz) of the unstable mode agrees well with the experiment. These results illustrate the importance of accounting for heat transfer/losses when applying LES for the prediction of combustion instabilities. Uncertainties caused by unsuitable modeling strategies when using computational fluid dynamics for the prediction of combustion instabilities can lead to an improper design of passive control methods (such as Helmholtz resonators) as these are often only effective in a limited frequency range.

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“…Obtaining knowledge of the flame dynamics remains a significant area of research and many studies, both experimental [10][11][12][13][14][28][29][30][31][32] and theoretical [2,3,9,[15][16][17][18], have been aimed at achieving greater understanding of the flame response to perturbations. The flame is known to behave as a low pass filter with respect to excitations, exhibiting a response at low frequencies which rolls off at higher frequencies.…”

Section: Introductionmentioning

confidence: 99%

Measurements of ensemble averaged flame dynamics using spatially resolved analysis

Ranalli

Martin

Vandsburger

2011

Experimental Thermal and Fluid Science

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Prediction of Stability Limits for Lp and LPP Gas Turbine Combustors

Cited by 20 publications

References 12 publications

Acoustic modeling of perforated plates with bias flow for Large-Eddy Simulations

Acoustic modeling of perforated plates with bias flow for Large-Eddy Simulations

Influence of Heat Transfer and Material Temperature on Combustion Instabilities in a Swirl Burner

Measurements of ensemble averaged flame dynamics using spatially resolved analysis

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