Influence of side wall expansion angle and swirl generator on flow pattern in a model combustor calculated with k–ε model

Mondal, Subrata; Datta, Amitava; Sarkar, A.

doi:10.1016/j.ijthermalsci.2004.01.006

Cited by 15 publications

(6 citation statements)

References 44 publications

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“…The standard k-two-equation turbulence model has been widely applied to engineering practice, but has been criticized as being only qualitatively correct in the simulation of confined swirling flows [19][20][21][22][23]. This is because of the neglect of anisotropic eddy viscosity and additional turbulence generation arising from the effects of streamline curvature in the standard k-model [20,24].…”

Section: Governing Equations and Turbulence Modelmentioning

confidence: 99%

3D numerical simulation of compressible swirling flow induced by means of tangential inlets

Guo

Chen

2008

Numerical Methods in Fluids

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SUMMARYThe objective of the present work is to predict compressible swirl flow in the nozzle of air-jet spinning using the realizable k-turbulence model and discuss the effect of the nozzle pressure. The periodic change of flow patterns can be observed. The recirculation zone near the wall of the injectors upstream increases in size and moves gradually upstream, whereas the vortex breakdown in the injector downstream shifts slowly towards the nozzle outlet during the whole period. A low axial velocity in the core region moves gradually away from the centerline, and the magnitude of the center reverse flow and the area occupied by it increase with axial distance due to the vortex breakdown. From the tangential velocity profile, there is a very small free-vortex zone. With increasing nozzle pressure, the velocity increases and the location of vortex breakdown is moved slightly downward. However, the increase in the velocity tends to decline at nozzle pressure up to a high level.

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Section: Governing Equations and Turbulence Modelmentioning

confidence: 99%

3D numerical simulation of compressible swirling flow induced by means of tangential inlets

Guo

Chen

2008

Numerical Methods in Fluids

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“…1). In order to restrict the number of design parameters to consider, the paper analyses only isothermal data according to the many literature studies performed in nonreacting conditions and considering that the chemical reaction affects only slightly the flow field especially in low-swirl combustors [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Reynolds number and the basic design parameters on the isothermal flow field of low-swirl combustors

Gobbato

Masi

Cappelletti

et al. 2017

Experimental Thermal and Fluid Science

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Swirling flows through sudden expansions is a common solution adopted to stabilise the flame within combustion systems. Fuel-air mixing promoted by the swirling motion contributes also to complete the fuel oxidation and reduce pollutant emissions. (http://www.sciencedirect.com/science/article/pii/S0894177717300304) 2 extended considering original measurements performed by the authors on a laboratory combustor.The comparison shows that the flow field of low-swirl combustors is mainly affected by the Reynolds number. Among the design parameters considered, the expansion ratio is the most significant. In particular, the former controls the radial position of the velocity peak whereas the latter influences the axial decay of velocity within the jet core.

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“…Separators have been the subject of extensive experimental, analytical, and numerical studies [2][3][4][5][6][7][8]. Due to complicated 3-D (three-dimensional), strongly swirl, turbulent, two-phase flows, the majority of studies were numerical in nature.…”

Section: Introductionmentioning

confidence: 99%

Double vortex generators for increasing the separation efficiency of the air separator

Jawarneh¹,

Al‐Widyan²,

Al-Migdady³

et al. 2017

IJHT

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This article presents a numerical analysis of multi-phase flow with powerful swirling streams in a cylindrical separator equipped with two vortex generators in an attempt to predict the separation efficiency of an air-water mixture. New design of a cylindrical separator is introduced for air-water mixture.The mixture multiphase and large eddy simulation (LES) turbulence models were applied. Images that concern velocity field, pressure, and volume fraction are introduced. Air phase is trapped and localized along the centerline of the separator and then migrates toward the upper exit hole, while water phase is distributed and rotated along the wall, then confined at the mid-separator due to two strong clock-wise centrifugal forces before it is expelled through its exit at mid of separator. It was found that the separation efficiency at constant Reynolds number of 8×10 4 with two feeding volume fractions of 95% and 90% are 97.8% and 96.1%, respectively. Also, the separation efficiency at constant feeding volume fraction of 95% with two Reynolds numbers of 2×10 5 and 8×10 4 are 98.6% and 97.8%, respectively. It is revealed that the separation efficiency will increase as the Reynolds number increases and/or increasing the volume fraction.

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Influence of side wall expansion angle and swirl generator on flow pattern in a model combustor calculated with k–ε model

Cited by 15 publications

References 44 publications

3D numerical simulation of compressible swirling flow induced by means of tangential inlets

3D numerical simulation of compressible swirling flow induced by means of tangential inlets

Effect of the Reynolds number and the basic design parameters on the isothermal flow field of low-swirl combustors

Double vortex generators for increasing the separation efficiency of the air separator

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