Combustion dynamics of a low-swirl combustor

Kang, Dal Mo; Culick, F. E. C.; Ratner, Albert

doi:10.1016/j.combustflame.2007.07.017

Cited by 134 publications

(54 citation statements)

References 25 publications

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“…These phenomena are generally referred to as "combustion dynamics", and constitute one of the most challenging areas in combustion research [3]. The flame response to axial oscillations has been deeply investigated by researchers in the recent years in both non-swirling [4,5] and, as the current study, swirling flames [6][7][8][9][10][11]. Because of the intrinsic unsteadiness of the phenomena, the dynamics of swirl-stabilised flames (i.e.…”

Section: Introductionmentioning

confidence: 99%

Large Eddy Simulation of the Sensitivity of Vortex Breakdown and Flame Stabilisation to Axial Forcing

Iudiciani

Duwig

2011

Flow Turbulence Combust

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The effect of axial forcing on the flame/vortex breakdown interaction is studied, with particular focus on the Precessing Vortex Core (PVC). Large Eddy Simulation (LES), together with a filtered flamelet model describing the subgrid combustion, is performed to study a lean premixed flame undergoing mass flow fluctuations in a wide range of frequencies and amplitude. In average, forcing at frequencies lower than the PVC characteristic frequency moves the recirculation zone upstream the combustor in the premixing tube, while higher frequencies do not relevantly affect the flow/flame. With the help of Proper Orthogonal Decomposition (POD) a detailed analysis of the dynamics of the central recirculation zone (CRZ) is performed showing how the excitation at lower frequencies weakens the PVC and allows the flame to propagate upstream. Extended POD is also applied to illustrate the flow/flame interactions during the excitation cycle.

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Section: Introductionmentioning

confidence: 99%

Large Eddy Simulation of the Sensitivity of Vortex Breakdown and Flame Stabilisation to Axial Forcing

Iudiciani

Duwig

2011

Flow Turbulence Combust

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“…Figure 4 presents the instance axial velocity distributions in the center cross-sections of the combustor inside the combustion chamber, for all cases examined. Fresh incoming fuel/oxidant streams enter into the combustion chamber through the axial swirler and diagonal swirler arranged concentrically at outer of the pilot fuel nozzle which form two swirling flows with different axial and azimuthal velocities inside the combustion chamber [3]. Under the influence of centrifugal forces, the swirling flow sudden expansion and merge to form a wide cone inside the combustion chamber where the main flow is located.…”

Section: Validation Of the Numerical Simulationsmentioning

confidence: 99%

“…Under the influence of centrifugal forces, the swirling flow sudden expansion and merge to form a wide cone inside the combustion chamber where the main flow is located. In consequence, sufficiently degree of adverse pressure gradient is formed which induces a central toroidal recirculation zone (CTRZ) in vicinity to the centerline of combustor [3]. Boundary of CTRZ extends to the exit of the hybrid combustor.…”

Section: Validation Of the Numerical Simulationsmentioning

confidence: 99%

“…Some new combustion technologies have been introduced to gas turbine industry to ensure low NOx emission since mid-80s, which include lean premixed combustion, rich burn quick quench lean burn combustion and catalytic combustion. Among the above technologies, lean premixed combustion is the most promising technology for gas turbine industry in recent years [3]. In lean premixed combustion, fuel and air are premixed to avoid the formation of stoichiometric regions inside the combustion chamber [4].…”

Section: Introductionmentioning

confidence: 99%

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LES of Swirl Angle on Combustion Dynamic and NOx Formation in a Hybrid Industrial Combustor

Shi¹,

Fu²,

Shen³

et al. 2016

IJHT

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Impact of diagonal swirler vane angle on combustion dynamic and NOx formation characteristic in a hybrid industrial combustor is numerically studied using a full compressible large eddy simulation approach. The predicted results show that increase the swirler vane angle enlarges the magnitude of the CTRZ and thus the coherent structure and off-axis motions of vortex cores which increase the pressure oscillations amplitude. Phenomenon of combustion instability does not occur due to the introduction of pilot diffusion flame. Formation rate of NOx is relatively slower in pilot diffusion flame, because excess air contained in pilot fuel streams dilutes the flame temperature. Regions with peak flame temperature and maximum formation rate of NOx located in vicinity to the sidewall of combustion chamber especially in the shell side. Proper increase of diagonal swirler vane angle to enlarges the divergence angle of flame and reduces the recirculation of hot gases and combustion products in outer recirculation zones to control peak temperature of flame is an effective means to control NOx emissions for this hybrid industrial combustor. Further increase the diagonal swirler vane angle will have relatively smaller impacts on compressing the NOx emission due to the confinement of combustion chamber.

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“…The flame base behavior and NO production rates were also studied [14,15]. Work by Kang et al [16] focused on the measurement of swirl combustor dynamics, employing modern laser-based experimental techniques, and fuel-air ratio…”

Section: Introductionmentioning

confidence: 99%

Measurements of fuel mixture fraction oscillations of a turbulent jet non-premixed flame

Kang¹,

Fernández²,

Ratner³

et al. 2009

Combustion and Flame

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Combustion dynamics of a low-swirl combustor

Cited by 134 publications

References 25 publications

Large Eddy Simulation of the Sensitivity of Vortex Breakdown and Flame Stabilisation to Axial Forcing

Large Eddy Simulation of the Sensitivity of Vortex Breakdown and Flame Stabilisation to Axial Forcing

LES of Swirl Angle on Combustion Dynamic and NOx Formation in a Hybrid Industrial Combustor

Measurements of fuel mixture fraction oscillations of a turbulent jet non-premixed flame

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