Dynamic Response of Turbulent Low Emission Flames at Different Vortex Breakdown Conditions

Biagioli, Fernando; Paikert, B.; Génin, Franklin; Noiray, Nicolas; Bernero, Stefano; Syed, Khawar

doi:10.1007/s10494-012-9431-y

Cited by 9 publications

(11 citation statements)

References 19 publications

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“…It has been shown in [8] that the Flame Transfer Function receives a significant contribution from fluctuations in flame surface area driven by the dynamic response in shape and position of the CRZ which indeed controls flame stabilization. Assuming the flame to be attached to the apex of the CRZ, flame surface area fluctuations are produced by axial fluctuations of the flame anchoring location which strongly depends upon the dynamic displacement of the CRZ.…”

Section: Introductionmentioning

confidence: 99%

“…Assuming the flame to be attached to the apex of the CRZ, flame surface area fluctuations are produced by axial fluctuations of the flame anchoring location which strongly depends upon the dynamic displacement of the CRZ. More specifically a novel methodology was developed in [8] which allows determining the contribution of flow coherent structures to the classic Flame Transfer Function (FTF) used in thermoacoustic stability analysis of combustion systems. This methodology, which relies on Large Eddy Simulation, makes use of the Wiener-Hopf (W-H) filtering technique [9] combined with the Proper Orthogonal Decomposition (POD) [10].…”

Section: Introductionmentioning

confidence: 99%

“…Typical FTFs predicted with LES in [8] for lean premixed flames stabilized in a swirling flow subject to vortex breakdown are shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

“…A deeper insight into the flame dynamic response has been obtained in [8] via the decomposition of the FTF first into two contributions driven by turbulent flame speed and flame surface area fluctuations and then into sub-contributions related to coherent structures using the POD method. Results obtained from this approach are shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…FTF from LES as calculated in[8] in case of a swirl stabilized flame at different values of the air excess factor. Left: FTF from experiments, Right: FTF from LES function inFig.…”

mentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Typical FTFs predicted with LES in [8] for lean premixed flames stabilized in a swirling flow subject to vortex breakdown are shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…FTF from LES as calculated in[8] in case of a swirl stabilized flame at different values of the air excess factor. Left: FTF from experiments, Right: FTF from LES function inFig.…”

mentioning

confidence: 99%

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

Biagioli

Lachaux

Narendran

2014

Flow Turbulence Combust

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Acoustic forcing on swirling flow: experiments and simulation

2014

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We investigated the effect of sound irradiated from loudspeakers on the flow of preheated air in the combustion chamber of a swirl burner. The temporally periodic pattern of the flow generated by the sound was detected by fast particle image velocimetry (PIV), with a repetition rate that was adapted to the observation of 12 phase angles of the irradiated monochromatic sound. The strong observed movement of the air is related to the movement by the sound itself, as determined by the pressure measurements with microphones. The PIV measurements reveal also a nonlinear interaction between the irradiated sound and the precession of the vortex core. The accuracy of the sound measurements was tested by determining in quiescent air the acoustic velocity by microphones and as well by PIV; good agreement was obtained thereby. Numerical calculations, using large eddy simulation and accounting for the sound forcing by variation in the mass flow at the inlet of the computational domain, approximately reproduce some of the experimental results.

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An experimental study of interacting swirl flows in a model gas turbine combustor

2018

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Dynamic Response of Turbulent Low Emission Flames at Different Vortex Breakdown Conditions

Cited by 9 publications

References 19 publications

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

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

Acoustic forcing on swirling flow: experiments and simulation

An experimental study of interacting swirl flows in a model gas turbine combustor

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