Characterization of Forced Flame Response of Swirl-Stabilized Turbulent Lean-Premixed Flames in a Gas Turbine Combustor

Kim, Kyu Tae; Lee, Jong Guen; Lee, Hyung Ju; Quay, Bryan D.; Santavicca, Domenic A.

doi:10.1115/1.3204532

Cited by 89 publications

(21 citation statements)

References 26 publications

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“…The outer flame front in the OSL can clearly be identified in both images leading to an M flame shape. As suggested in [3] , the increase in laminar burning velocity S 0 l due to the increase of X fuel H 2 helps the reaction zone to propagate upstream through the OSL. The presence of the outer flame front in the OSL also depends on the stretch limit which is strongly extended when the Lewis number of the combustible mixture decreases [6] as it is the case when the fuel is enriched with hydrogen [46,47] .…”

Section: Impact Of Fuel Composition On the Flame Topologymentioning

confidence: 85%

“…The shape taken by the flame then affects the temperature field in the burnt gases at the outlet of the combustion chamber and pollutant emissions. Experiments and simulations indicate that the topology of swirling flames is highly sensitive to fuel composition [3][4][5] and heat transfer to the combustion chamber walls [6][7][8][9][10] . Simulations of the stabilization regimes of these flames are very challenging as numerous physical phenomena such as the combustion chemistry, flame interactions with turbulence, and heat losses have to be taken into account.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental and numerical investigation of the influence of thermal boundary conditions on premixed swirling flame stabilization

Mercier

Guiberti

Chatelier

et al. 2016

Combustion and Flame

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This paper focuses on the experimental and numerical investigation of the shape taken by confined turbulent CH 4 /H 2 /air premixed flames stabilized over a bluff-body swirling injector. Two configurations, which correspond to two levels of H 2 enrichment in the CH 4 /H 2 fuel blend, are investigated. Experiments show that high H 2 concentrations promote M flame shapes, whereas V flame shapes are observed for lower values of H 2 enrichment. In both cases, non-reacting and reacting flow Large Eddy Simulation (LES) calculations were performed. Numerical results are compared with detailed velocimetry measurements under non-reacting and reacting conditions, OH-laser induced fluorescence and OH * chemiluminescence measurements. All temperatures of solid walls of the experimental setup including the combustor dump plane, the injector central rod tip, the combustor sidewalls and the quartz windows were also characterized. Assuming a fully adiabatic combustion chamber, LES always predicts an M flame shape and does not capture the V to M shape transition observed in the experiments when the hydrogen concentration in the fuel blend is increased. By accounting for non-adiabaticity using measured thermal boundary conditions, simulations predict the correct flame stabilization for both V and M flames and show a good agreement with experiments in terms of flame shape. Key features that need to be included in non-adiabatic simulations are finally stressed out.

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Section: Impact Of Fuel Composition On the Flame Topologymentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of the influence of thermal boundary conditions on premixed swirling flame stabilization

Mercier

Guiberti

Chatelier

et al. 2016

Combustion and Flame

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“…As a result, the net effect of H 2 addition on NO x formation is determined by the combined effects. Studies focused on the flame structures and combustion oscillations showed that the use of H 2 significantly altered the flame characteristics due to the different properties of transport and chemical reactivity [18,19]. Some investigations with a swirl-stabilized configuration indicated that the thermoacoustic instabilities were very sensitive to the H 2 molar fraction in the fuel blends [20,21].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Hydrogen Addition Effects on a Swirl-Stabilized Methane-Air Flame

Tong

Klingmann

et al. 2017

Energies

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Abstract:The effects of H 2 addition on a premixed methane-air flame was studied experimentally with a swirl-stabilized gas turbine model combustor. Experiments with 0%, 25%, and 50% H 2 molar fraction in the fuel mixture were conducted under atmospheric pressure. The primary objectives are to study the impacts of H 2 addition on flame lean blowout (LBO) limits, flame shapes and anchored locations, flow field characteristics, precessing vortex core (PVC) instability, as well as the CO emission performance. The flame LBO limits were identified by gradually reducing the equivalence ratio until the condition where the flame physically disappeared. The time-averaged CH chemiluminescence was used to reveal the characteristics of flame stabilization, e.g., flame structure and stabilized locations. In addition, the inverse Abel transform was applied to the time-averaged CH results so that the distribution of CH signal on the symmetric plane of the flame was obtained. The particle image velocimetry (PIV) was used to detect the characteristics of the flow field with a frequency of 2 kHz. The snapshot method of POD (proper orthogonal decomposition) and fast Fourier transform (FFT) were adopted to capture the most prominent coherent structures in the turbulent flow field. CO emission was monitored with an exhaust probe that was installed close to the combustor exit. The experimental results indicated that the H 2 addition extended the flame LBO limits and the operation range of low CO emission. The influence of H 2 addition on the flame shape, location, and flow field was observed. With the assistance of POD and FFT, the combustion suppression impacts on PVC was found.

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“…For S 0 = 0.70, combustion is more compact and takes place closer to the injector rim, but the flame switches intermittently between a V-shape stabilized at the burner outlet and a lifted pattern far away from the burner. Between 0.75 ≤ S 0 < 0.95, the flame takes a well defined Vshape [11,34] with a flame leading edge lying above the burner outlet z f > 0. Figure 3(c) shows the reference flame obtained for S 0 = 0.85 that will be further examined with PIV and OH-PLIF diagnostics.…”

Section: Flame Stabilizationmentioning

confidence: 99%

Stabilization Mechanisms of Swirling Premixed Flames With an Axial-Plus-Tangential Swirler

Jourdaine

Mirat

Caudal

et al. 2018

Journal of Engineering for Gas Turbines and Power

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The stabilization of premixed flames within a swirling flow produced by an axial-plus-tangential swirler is investigated in an atmospheric test rig. In this system, flames are stabilized aerodynamically away from the solid components of the combustor without the help of any solid anchoring device. Experiments are reported for lean CH4/air mixtures, eventually also diluted with N2, with injection Reynolds numbers varying from 8500 to 25,000. Changes of the flame shape are examined with OH* chemiluminescence and OH laser-induced fluorescence measurements as a function of the operating conditions. Particle image velocimetry (PIV) measurements are used to reveal the structure of the velocity field in nonreacting and reacting conditions. It is shown that the axial-plus-tangential swirler allows to easily control the flame shape and the position of the flame leading edge with respect to the injector outlet. The ratio of the bulk injection velocity over the laminar burning velocity Ub/SL, the adiabatic flame temperature Tad, and the swirl number S0 are shown to control the flame shape and its position inside the combustion chamber. It is then shown that the axial velocity field produced by the axial-plus-tangential swirler is different from those produced by purely axial or radial devices. It takes here a W-shape profile with three local maxima and two minima. The mean turbulent flame front also takes this W-shape in an axial plane, with two lower positions located slightly off-axis and corresponding to the positions where the axial flow velocity is the lowest. It is finally shown that these positions can be inferred from axial flow velocity profiles under nonreacting conditions.

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Characterization of Forced Flame Response of Swirl-Stabilized Turbulent Lean-Premixed Flames in a Gas Turbine Combustor

Cited by 89 publications

References 26 publications

Experimental and numerical investigation of the influence of thermal boundary conditions on premixed swirling flame stabilization

Experimental and numerical investigation of the influence of thermal boundary conditions on premixed swirling flame stabilization

Experimental Study of Hydrogen Addition Effects on a Swirl-Stabilized Methane-Air Flame

Stabilization Mechanisms of Swirling Premixed Flames With an Axial-Plus-Tangential Swirler

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