Dynamic response of turbulent swirling flames to acoustic perturbations

Borghesi, Giulio; Biagioli, Fernando; Schuermans, Bruno

doi:10.1080/13647830902829383

Cited by 19 publications

(3 citation statements)

References 21 publications

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“…However, the complex ow-elds in gas turbine combustors do not allow for such simplifying assumptions, as the ow may be highly three dimensional. Swirling ows, for example, commonly used to stabilize ames in gas turbine engines, have not been faithfully modelled by this approach [22,68,69]. Proper modelling of swirl-stabilized combustors therefore requires a better understanding of swirling ows, and how they behave in acoustic elds.…”

Section: Flame Sheet Modellingmentioning

confidence: 99%

Thermo-acoustic velocity coupling in a swirl stabilized gas turbine model combustor

Caux-Brisebois

Steinberg

Arndt

et al. 2014

Combustion and Flame

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ii Acknowledgements The fact that the cover page of this thesis reads Vincent R. Caux-Brisebois is a misleading proposition that the content of this work is the product of a single man's endeavour.Although nothing would please me more than adding the names of all those who made this possible, the imposed front-to-back limit of 100 pages would hardly allow the table of contents to be published. Nevertheless, I will try to show my appreciation to all those who made this possible in the short space that is available to me.The second name that would go on the cover page of this document is without doubt Prof. Adam M. Steinberg's. In fact, if the degree of MASc. were not conditional to this dissertation, I would likely insist that it be written above mine. Prof. Steinberg is one of the few supervisors that I have known to always work with his door wide open. At any time during his long working hours, any student can walk in and ask any question knowing he or she will be well received, treated fairly, and perhaps most importantly, get the help they need. The work presented in this thesis would not have been possible without his valuable input, guidance, and hard work. Though I could go on about why Prof. Steinberg is a model supervisor, I have to cut this discussion short for the sake of space, and take this opportunity to thank the second reader of this dissertation, Prof. C. P. T. Groth, for taking some time out of his already-full schedule to review this work.

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Section: Flame Sheet Modellingmentioning

confidence: 99%

Thermo-acoustic velocity coupling in a swirl stabilized gas turbine model combustor

Caux-Brisebois

Steinberg

Arndt

et al. 2014

Combustion and Flame

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“…the fluctuation of axial velocity due to this mode amounts to a rather strong, fourfold, the imposed fluctuation in bulk flow velocity through the burner. It is worth mentioning that the displacement of the CRZ apex was found in [18] as the driving mechanism for the flame dynamic response (the FTF). The premixed flame in fact stabilizes and moves together with the apex of the CRZ, especially in the case of the CRZ structure investigated here.…”

Section: Resultsmentioning

confidence: 99%

Investigation of the Dynamic Response of Swirling Flows Based on LES and Experiments

Biagioli

Lachaux

Narendran

2014

Flow Turbulence Combust

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The dynamic response of a swirling flow undergoing vortex breakdown is investigated via Large Eddy Simulation (LES) and experiments in a water flow facility. The investigation is carried out following previous work on the link between thermoacoustic combustion instabilities and coherent structures in lean premixed gas turbine combustors. The velocity field transfer function is obtained in LES from the Unit Impulse Response determined via application of a low intensity broadband noise perturbation of the inflow mass flow rate and the Wiener-Hopf filtering method. In the experiments, harmonic fluctuations in the water flow rate through the swirler are generated via a piston mounted on the side wall of the test facility and activated with a low frequency linear motor. The velocity field transfer function is then obtained via phase averaging applied to Particle Image Velocimetry snapshots which are collected at prescribed values of the harmonic phase. The analysis, which is carried out in terms of coherent structures identified via Proper Orthogonal Decomposition, gives numerical transfer functions with amplitude and phase consistent with the experimental ones.

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“…Under the effect of acoustic forcing, the annular jet formed in the swirling flow fluctuates, and the vortex breakdown bubble is dynamically displaced. This results in deformations of the flame front and oscillations of the flame anchor point (Borghesi, Biagioli, Schuermans 2009;Gatti et al 2019;Thumuluru and Lieuwen 2009). If the fuel is injected close to or inside the swirler, a situation which is typically found in practical systems, acoustic perturbations at the injector generate fluctuations in the mixture ratio.…”

Section: Introductionmentioning

confidence: 99%

Combustion Dynamics of Annular Systems

Vignat

Durox

Schuller

et al. 2020

Combustion Science and Technology

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New results on the dynamics of annular combustors during ignition and combustion instabilities will be reviewed. Ignition dynamics is considered first by examining experiments carried out in a system comprising a plenum feeding premixed gaseous reactants through multiple swirling injectors and an annular combustor formed by two concentric transparent quartz walls allowing full optical access to the flame. The analysis focuses on the "light-round" process during which the flame spreads from one injector to the next eventually leading to established flames on each injector. The transparent lateral walls allow a full view of the flame propagation from a spark igniter located in the neighborhood of one injector. High speed imaging is used to examine flame displacement and deduce the ignition delay yielding a full light around of the annular combustor. Changes associated to operation with spray flames are then discussed. The second part of this article is concerned with combustion instabilities of annular systems coupled by azimuthal modes. This type of oscillation has received considerable attention in recent years because the underlying coupling is often observed in the advanced premixed combustion architectures used in modern gas turbines. Recent studies have allowed a detailed examination of the dynamics of annular devices comprising multiple swirling injectors. Experiments on annular systems and single sector configurations provide new insight on the coupling process between acoustics and unsteady combustion. Results for self-sustained combustion oscillations coupled by azimuthal modes are presented for operation with gaseous premixed reactants and with spray flames.

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Dynamic response of turbulent swirling flames to acoustic perturbations

Cited by 19 publications

References 21 publications

Thermo-acoustic velocity coupling in a swirl stabilized gas turbine model combustor

Thermo-acoustic velocity coupling in a swirl stabilized gas turbine model combustor

Investigation of the Dynamic Response of Swirling Flows Based on LES and Experiments

Combustion Dynamics of Annular Systems

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