Advanced

Investigation of two-equation turbulence models applied to a confined axis-symmetric swirling flow

Engdar, Ulf LU and Klingmann, Jens LU (2002) Computational technologies for Fluid/Thermal/Structural/Chemical Systems with Industrial Applications (2002 ASME Prssure Vessels and Piping Conference) In American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP 448(2). p.199-206
Abstract
The modeling of industrial combustion applications today is almost exclusively based on two-equation turbulence models. Despite its known limitations, the most the widely used model is still the standard k-ε model. The objective of this paper is to investigate the performance of two-equation turbulence models applied to a confined swirling flow. Numerical modeling of an axis-symmetric confined sudden expansion, followed by a contraction with the assumption of steady flow and an incompressible fluid, has been conducted. The flow field is what can be expected in simplified dump gas turbine combustor geometry. In this investigation, three different swirl cases were considered: no swirl, moderate swirl (no central re-circulation zone) and... (More)
The modeling of industrial combustion applications today is almost exclusively based on two-equation turbulence models. Despite its known limitations, the most the widely used model is still the standard k-ε model. The objective of this paper is to investigate the performance of two-equation turbulence models applied to a confined swirling flow. Numerical modeling of an axis-symmetric confined sudden expansion, followed by a contraction with the assumption of steady flow and an incompressible fluid, has been conducted. The flow field is what can be expected in simplified dump gas turbine combustor geometry. In this investigation, three different swirl cases were considered: no swirl, moderate swirl (no central re-circulation zone) and strong swift (a central recirculation zone occurring). The models investigated were: the standard k-ε model, a curvature-modified k-ε model, Chen's k-ε model, a cubic non-linear k-ε model, the standard k-ω model and the Shear Stress Transport (SST) k-ω model. The results show that almost all models were able to predict the major impact of the moderate swirl: reduced outer re-circulation lengths and retardation of the axial velocity on the center-line. However, the Chen k-ε model and the SST k-ω model were found to better reproduce the mean velocity field and the turbulent kinetic energy field from the measurements. For a strong swift, a large re-circulation zone is formed along the center-line, which the standard k-ε model and the modified k-ε model fail to predict. However, the shape and size of the re-circulation zone differ strongly between the models. At this swirl number, the performances of all models were, without exception, worse than for the lower swift numbers. The SST k-ω model achieved the best agreement between computations and experimental data. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Gas turbine combustors
in
American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
volume
448
issue
2
pages
199 - 206
publisher
American Society Of Mechanical Engineers (ASME)
conference name
Computational technologies for Fluid/Thermal/Structural/Chemical Systems with Industrial Applications (2002 ASME Prssure Vessels and Piping Conference)
external identifiers
  • other:CODEN: AMPPD5
  • scopus:0036382384
ISSN
0277-027X
language
English
LU publication?
yes
id
9120324e-fa54-4856-b339-86871f9198b9 (old id 610536)
date added to LUP
2007-11-27 11:59:36
date last changed
2017-12-10 04:25:27
@inproceedings{9120324e-fa54-4856-b339-86871f9198b9,
  abstract     = {The modeling of industrial combustion applications today is almost exclusively based on two-equation turbulence models. Despite its known limitations, the most the widely used model is still the standard k-ε model. The objective of this paper is to investigate the performance of two-equation turbulence models applied to a confined swirling flow. Numerical modeling of an axis-symmetric confined sudden expansion, followed by a contraction with the assumption of steady flow and an incompressible fluid, has been conducted. The flow field is what can be expected in simplified dump gas turbine combustor geometry. In this investigation, three different swirl cases were considered: no swirl, moderate swirl (no central re-circulation zone) and strong swift (a central recirculation zone occurring). The models investigated were: the standard k-ε model, a curvature-modified k-ε model, Chen's k-ε model, a cubic non-linear k-ε model, the standard k-ω model and the Shear Stress Transport (SST) k-ω model. The results show that almost all models were able to predict the major impact of the moderate swirl: reduced outer re-circulation lengths and retardation of the axial velocity on the center-line. However, the Chen k-ε model and the SST k-ω model were found to better reproduce the mean velocity field and the turbulent kinetic energy field from the measurements. For a strong swift, a large re-circulation zone is formed along the center-line, which the standard k-ε model and the modified k-ε model fail to predict. However, the shape and size of the re-circulation zone differ strongly between the models. At this swirl number, the performances of all models were, without exception, worse than for the lower swift numbers. The SST k-ω model achieved the best agreement between computations and experimental data.},
  author       = {Engdar, Ulf and Klingmann, Jens},
  booktitle    = {American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP},
  issn         = {0277-027X},
  keyword      = {Gas turbine combustors},
  language     = {eng},
  number       = {2},
  pages        = {199--206},
  publisher    = {American Society Of Mechanical Engineers (ASME)},
  title        = {Investigation of two-equation turbulence models applied to a confined axis-symmetric swirling flow},
  volume       = {448},
  year         = {2002},
}