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

Wu, Yajing LU ; Carlsson, Christian LU ; Szász, Robert-Zoltán LU ; Peng, L.; Fuchs, Laszlo LU and Bai, Xue-Song LU (2016) In Fuel 170. p.210-225
Abstract
Large 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... (More)
Large 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 sub grid scale models are carried out. The mean flow field shows different vortex breakdown structures when the contraction ratio changes from 0325 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. (C) 2015 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Swirling flow, Vortex breakdown, Gas turbine combustor, Outlet, contraction
in
Fuel
volume
170
pages
210 - 225
publisher
Elsevier
external identifiers
  • wos:000368949600021
  • scopus:84952845526
ISSN
1873-7153
DOI
10.1016/j.fuel.2015.12.035
language
English
LU publication?
yes
id
63e3f549-8f92-4b6f-abbb-f02b297efa7d (old id 8728486)
date added to LUP
2016-02-26 10:36:10
date last changed
2017-10-22 04:05:21
@article{63e3f549-8f92-4b6f-abbb-f02b297efa7d,
  abstract     = {Large 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 sub grid scale models are carried out. The mean flow field shows different vortex breakdown structures when the contraction ratio changes from 0325 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. (C) 2015 Elsevier Ltd. All rights reserved.},
  author       = {Wu, Yajing and Carlsson, Christian and Szász, Robert-Zoltán and Peng, L. and Fuchs, Laszlo and Bai, Xue-Song},
  issn         = {1873-7153},
  keyword      = {Swirling flow,Vortex breakdown,Gas turbine combustor,Outlet,contraction},
  language     = {eng},
  pages        = {210--225},
  publisher    = {Elsevier},
  series       = {Fuel},
  title        = {Effect of geometrical contraction on vortex breakdown of swirling turbulent flow in a model combustor},
  url          = {http://dx.doi.org/10.1016/j.fuel.2015.12.035},
  volume       = {170},
  year         = {2016},
}