Sensitivity of swirling flows to small changes in the swirler geometry

Bourgouin, Jean-François; Moeck, Jonas P.; Durox, Daniel; Schuller, Thierry; Candel, Sébastien

doi:10.1016/j.crme.2012.10.018

Cited by 37 publications

(27 citation statements)

References 19 publications

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“…Bourgouin et al 11 experimentally and numerically studied the impact of swirler structure on the central recirculation zone and the precessing vortex core (PVC) and they obtained that an increase in the swirler blade length could augment the maximum axial and azimuthal mean velocities downstream of the swirler and lead to an increase in the root mean square (RMS) velocity levels. With an increase in the swirl number, the central recirculation zone expanded in the transverse direction.…”

Section: Introductionmentioning

confidence: 98%

Effect of boundary conditions on downstream vorticity from counter-rotating swirlers

Huo

Lin

Zhang

et al. 2015

Chinese Journal of Aeronautics

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Particle image velocimetry (PIV) is utilized to measure the non-reacting flow field in a reflow combustor with multiple and single swirlers. The velocity field, vortex structure and total vorticity levels are experimentally obtained using two different boundary conditions, representing a single confined swirler and multiple swirlers in an annular combustor. The influence of the boundary conditions on the flow field at several locations downstream of the swirlers is experimentally investigated, showing that the central vortex in the multi-swirler case is more concentrated than in the single-swirler case. The vorticity of the central vortex and average cross-sectional vorticity are relatively low at the swirler outlet in both cases. Both of these statistics gradually increase to the maximum values near 20 mm downstream of the swirler outlet, and subsequently decrease. It is also found that the central vortex in the multi-swirler case is consistently greater than the single-swirler case. These results demonstrate the critical influence of boundary conditions on flow characteristic of swirling flow, providing insight into the difference of the experiments on testbed combustor and the full-scale annular combustors. ª 2015 Production and hosting by Elsevier Ltd. on behalf of CSAA & BUAA.

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Section: Introductionmentioning

confidence: 98%

Effect of boundary conditions on downstream vorticity from counter-rotating swirlers

Huo

Lin

Zhang

et al. 2015

Chinese Journal of Aeronautics

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“…More recently, dynamic mode decomposition (DMD) [18,19], a method connected to POD, has been developed for extracting temporal correlation, where frequency specific spatial structures can be directly distinguished from time and spatially resolved data. DMD has been applied in combustion environments for elucidation of the effect of burner geometry on PVC [20] and flame/flow interaction in swirling flames [21]. POD and DMD are used here to analyze the effect of outlet contraction on the dynamic motion of the flow.…”

Section: Introductionmentioning

confidence: 99%

Effect of geometrical contraction on vortex breakdown of swirling turbulent flow in a model combustor

Carlsson

Szász

et al. 2016

Fuel

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a b s t r a c tLarge Eddy Simulation (LES) studies of isothermal and incompressible turbulent swirling flows in a model gas turbine combustion chamber geometry have been carried out. The focus is on the effect of outlet geometry contraction on the vortex breakdown structure and the precessing vortex core in the chamber. Nine different outlet geometries with different contraction ratio C r are considered. The results from a baseline case are compared with experimental data in the literature. The swirling flow is generated using a swirler with fifteen guide vanes similar to an existing industrial gas turbine burner. In all cases the swirler and the main chamber geometry are kept the same. The detailed swirler geometry is considered in the simulation using unstructured grids. Sensitivity tests on the influence of the grid resolution and the subgrid scale models are carried out. The mean flow field shows different vortex breakdown structures when the contraction ratio changes from 0.325 to 1.0. In particular, along the axis of the chamber the flow is shown to switch its direction when the contraction increases as a result of the change of the structure of the center recirculation zone. The underlying flow physics is analyzed by comparing the budget terms in the momentum equations, and by performing a global instability analysis.

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“…They claimed that their predictions agree with the corresponding experimental data. They stated that the flow structures and the precessing vortex core (PVC) frequency are extremely sensitive to the swirler geometry and have a strong effect on the combustion performances [5].…”

Section: Swirl Flowmentioning

confidence: 99%

“…Bourgouin [5] conducted the study experimentally and numerically about the influence of a swirler geometry on the flow structures inside a gas turbine chamber using the LES approach. They claimed that their predictions agree with the corresponding experimental data.…”

Section: Swirl Flowmentioning

confidence: 99%

Effect of initial tangential intensity on the fluid dynamic characteristics in tangential burner

Budhi

Bindar

2017

MATEC Web Conf.

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Abstract. Swirl turbulent flow is intensively used by the industrial equipments such as combustion, separation and heat transfer equipments. The fluid dynamic characteristics of this flow are influenced by the chamber's geometries and the operating conditions. One of the important operating condition variables which greatly affects the fluid dynamic characteristics is initial tangential intensity (ITI) or often known as swirl number. This study is aimed to quantify the effect of the initial tangential intensity on the fluid dynamic characteristics in a tangential burner. The method of the study is based on the computational fluid dynamic simulation under the Ansys Fluent CFD engine. The fluid dynamic characteristics were modeled using the standard k-H turbulent model. The simulation results exhibited that the three dimensional flow structure in a tangential burner is dominated by the tangential flow. The fluid dynamic simulations also showed that the effect of the ITI on the mean turbulence intensity and the mean residence time begin to be significant at the ITI values ≥ 1.1 and ≥ 4.5 respectively, while at low ITI values, its effects on both variables are insignificant. The lowest pressure drop obtained in this study was found on the burner with ITI value of 3.2.

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Sensitivity of swirling flows to small changes in the swirler geometry

Cited by 37 publications

References 19 publications

Effect of boundary conditions on downstream vorticity from counter-rotating swirlers

Effect of boundary conditions on downstream vorticity from counter-rotating swirlers

Effect of geometrical contraction on vortex breakdown of swirling turbulent flow in a model combustor

Effect of initial tangential intensity on the fluid dynamic characteristics in tangential burner

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