Large-eddy simulations of the non-reactive flow in the Sydney swirl burner

Yang, Yang; Kær, Søren Knudsen

doi:10.1016/j.ijheatfluidflow.2012.02.008

Cited by 28 publications

(14 citation statements)

References 25 publications

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“…The mean velocity profiles for the annular jet and swirling flow were specified using power law distributions [25,32,40] such as 1 7…”

Section: Grid Resolution and Boundary Conditionsmentioning

confidence: 99%

“…A cubic compu- mm 3 is used as the spatial region of "snapshot POD". There should be enough intervals between snapshots to satisfy linear independence to describe one flow structure [32]. However, different flow structures have different integral time scales, so the uncorrelated time is difficult to decide.…”

Section: Pod Analysis Of the Unsteady Large-scale Structuresmentioning

confidence: 99%

“…Since large-scale structures lack a clear definition, this paper uses two viewpoints to identify large-scale structures, namely the Q -criterion [30] and proper orthogonal decomposition (POD) [31]. Yang and Kaer [32] employed LES to calculate iso-thermal flow fields of the Sydney swirl burner and captured vortex structures using the Q -criterion. Oberleithner et al [33] conducted experimental research for a turbulent swirling free jet, and three-dimensional large-scale structures were reconstructed using the POD method.…”

Section: Introductionmentioning

confidence: 99%

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Large eddy simulation of unconfined turbulent swirling flow

Zhang

Han

et al. 2015

Sci. China Technol. Sci.

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Large eddy simulations (LES) were performed to study the non-reacting flow fields of a Cambridge swirl burner. The dynamic Smagorinsky eddy viscosity model is used as the sub-grid scale turbulence model. Comparisons of experimental data show that the LES results are capable of predicting mean and root-mean-square velocity profiles. The LES results show that the annular swirling flow has a minor impact on the formation of the bluff-body recirculation zone. The vortex structures near the shear layers, visualized by the iso-surface of Q-criterion, display ring structures in non-swirling flow and helical structures in swirling flow near the burner exit. Spectral analysis was employed to predict the occurrence of flow oscillations induced by vortex shedding and precessing vortex core (PVC). In order to extract accurately the unsteady large-scale structures in swirling flow, a three-dimensional proper orthogonal decomposition (POD) method was developed to reconstruct turbulent fluctuating velocity fields. POD analysis reveals that flow fields contain co-existing helical and toroidal shaped coherent structures. The helical structure associated with the PVC is the most energetic dynamic flow structure. The latter toroidal structure associated with vortex shedding has lower energy content which indicates that it is a secondary structure. Cambridge swirl burner, large eddy simulation, proper orthogonal decomposition, vortex shedding and breakdown, precessing vortex core Citation: Zhang H D, Han C, Ye T H, et al. Large eddy simulation of unconfined turbulent swirling flow.

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“…The mean velocity profiles for the annular jet and swirling flow were specified using power law distributions [25,32,40] such as 1 7…”

Section: Grid Resolution and Boundary Conditionsmentioning

confidence: 99%

Section: Pod Analysis Of the Unsteady Large-scale Structuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Large eddy simulation of unconfined turbulent swirling flow

Zhang

Han

et al. 2015

Sci. China Technol. Sci.

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“…Numerous experimental [11][12][13][14][15] and numerical [16][17][18][19] studies were investigated swirling flows features at an isothermal condition. Ceglia et al [20] studied experimentally the three-dimensional flow field of a turbulent swirling jet in a model aero engine burn injector.…”

Section: Introductionmentioning

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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“…Müller and Kleiser [12] investigated vortex breakdown in a compressible swirling jet flow by LES using the approximate deconvolution model; their simulation showed good agreement with experimental results. Strong unsteady structure, PVC, and coherent structure of nonreactive swirl flow were captured in LES study of Yang and Kaer [13]. LES was also utilized to investigate many other aspects, including complex swirl flows [14], external intermittency [15], and modeling swirl flows with hybrid LES/RANS model [16].…”

Section: Introductionmentioning

confidence: 99%

Direct Numerical Simulation of Twin Swirling Flow Jets: Effect of Vortex-Vortex Interaction on Turbulence Modification

Gui

et al. 2014

Journal of Computational Engineering

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A direct numerical simulation (DNS) was carried out to study twin swirling jets which are issued from two parallel nozzles at a Reynolds number of Re = 5000 and three swirl levels of = 0.68, 1.08, and 1.42, respectively. The basic structures of vortex-vortex interaction and temporal evolution are illustrated. The characteristics of axial variation of turbulent fluctuation velocities, in both the near and far field, in comparison to a single swirling jet, are shown to explore the effects of vortex-vortex interaction on turbulence modifications. Moreover, the second order turbulent fluctuations are also shown, by which the modification of turbulence associated with the coherent or correlated turbulent fluctuation and turbulent kinetic energy transport characteristics are clearly indicated. It is found that the twin swirling flow has a fairly strong localized vortex-vortex interaction between a pair of inversely rotated vortices. The location and strength of interaction depend on swirl level greatly. The modification of vortex takes place by transforming largescale vortices into complex small ones, whereas the modulation of turbulent kinetic energy is continuously augmented by strong vortex modification.

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Large-eddy simulations of the non-reactive flow in the Sydney swirl burner

Cited by 28 publications

References 25 publications

Large eddy simulation of unconfined turbulent swirling flow

Large eddy simulation of unconfined turbulent swirling flow

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

Direct Numerical Simulation of Twin Swirling Flow Jets: Effect of Vortex-Vortex Interaction on Turbulence Modification

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