Swirl flow structure and flame characteristics in a model lean premixed combustor

Anacleto, P.; Fernandes, Edgar C.; Heitor, M. V.; Шторк, С. И.

doi:10.1080/00102200302354

Cited by 126 publications

(71 citation statements)

References 29 publications

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“…The CC is made of cylindrical stainless steel ducts with an inner diameter of 110 mm and a total length of 300 mm. The model burner, shown in Figure 1 was studied by Anacleto et al [26,27] and Mansouri et al [28] for reacting flow and by Cala et al [11] and Fernandes et al [12] for non-reacting flow.…”

Section: Methodsmentioning

confidence: 99%

Detached eddy simulation of non-reacting swirling flow in a vortex burner

Mansouri¹,

Boushaki²,

Aouissi³

2017

IJHT

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An unconfined high turbulent swirling flow is investigated using Detached Eddy Simulation (DES) in a premixed vortex burner. The burner operates with propane-air mixture at high swirl number Sn = 1.05 under atmospheric pressure. In this analysis, the focus of the investigation is the isothermal flow and its expansion at the burner exit. Comparisons of experimental data show that the DES results are capable of predicting the unsteady flow structure and mean velocity profiles. DES results show that the swirling flow is responsible of the formation of a recirculation zone (CRZ) in the center of the burner exit. A helical precessing vortex core (PVC) is detected in the inner shear layer (ISL). Phase-angle analysis of the instantaneous flow field shows the presence of unsteady stagnation points strongly associated with PVC. In addition, phase-angle analysis of the radial profiles of the instantaneous velocities (u, w) is employed to clarify better the instantaneous flow field. The vortex core inside the PVC is analyzed using two slices perpendicular to its axis. It is found that the vortex core is characterized by the limits of its circumferential velocity u(R) and its radius R.

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Section: Methodsmentioning

confidence: 99%

Detached eddy simulation of non-reacting swirling flow in a vortex burner

Mansouri¹,

Boushaki²,

Aouissi³

2017

IJHT

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“…The flame stability and its limits at each swirl number which is analyzed. A lean premixed swirl stabilized burner experimentally studied by Anacleto et al [12] is investigated numerically in this study. The approach is based on two dimensional axisymmetric burner geometry, steady state, RANS turbulence models, Finite-Rate/Eddy Dissipation model for chemical reactions and reduced chemical kinetics to three-step schemes for the combustion of premixed propane-air mixture.…”

Section: Introductionmentioning

confidence: 99%

“…For high values of Sn, they observed negative values of centerline axial velocity in the expansion plane which indicating the formation of the vortex-breakdown. Anacleto et al [12] performed an experimental study of the swirl flow structure and flame characteristics in a lean premixed burner. Their burner contains a swirler with adjustable vanes, which allow using various swirl numbers.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study of Swirl Effects on the Flow and Flame Dynamics in a Lean Premixed Combustor

Mansouri¹,

Aouissi²,

Boushaki³

2016

IJHT

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This paper reports a numerical investigation of an atmospheric lean-premixed swirl-stabilized burner. The focus on the flow behavior and flame stability is done at various swirl intensity to better understand the propane turbulent premixed flames. The numerical simulation is carried out using RANS technique with three turbulence closer models Standard k-ε, Realizable k-ε and SST k-ω. This in order to evaluate the performance of these models in the prediction of confined turbulent swirling flows. The turbulence-chemistry interaction scheme is modelled using Finite Rate-Eddy Dissipation model with three step global reaction mechanism. The combustor is operated with air and propane mixture under an atmospheric pressure at a global equivalence ratio of Φ = 0.5. The investigation is done using five different swirl numbers Sn = (0, 0.35, 0.75, 1.05, 1.4), including a validation with the available experimental data. Good agreement is found between RANS results and experimental data, in particular axial and radial velocity profiles, temperature and propane concentration profiles. Results indicate the presence of outer recirculation zone (ORZ) in the inlet burner corner, irrespective of the swirl number. When the swirl number reaches a critical value Sn = 0.75, an inner recirculation zone (IRZ) appears in the center of the burner inlet as a result of vortex-breakdown. Increasing swirl number to an excessive value leads to the propagation of the IRZ upstream the combustion chamber, and consequently the appearance of the flame flashback.

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“…88), while the frequency of PVC rotation increases with swirl when St >0. 88 [18]. Swirl number also affects the flow field and distribution of flame temperature, and thus the NOx formation characteristic.…”

Section: Introductionmentioning

confidence: 99%

“…88 [17]. Anacleto et al [18] studied the effects of swirl number on swirl flow structure and flame characteristic in a model lean premixed combustor. They concluded that the vortex core rotation induces an oscillation in static pressure field whose frequency decreases with St down to a minimum value (0.…”

Section: Introductionmentioning

confidence: 99%

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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Swirl flow structure and flame characteristics in a model lean premixed combustor

Cited by 126 publications

References 29 publications

Detached eddy simulation of non-reacting swirling flow in a vortex burner

Detached eddy simulation of non-reacting swirling flow in a vortex burner

A Numerical Study of Swirl Effects on the Flow and Flame Dynamics in a Lean Premixed Combustor

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

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