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 swirl (a central re-circulation 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 swirl, 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 swirl numbers. The SST k-ω model achieved the best agreement between computations and experimental data.
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ASME 2002 Pressure Vessels and Piping Conference
August 5–9, 2002
Vancouver, BC, Canada
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-4659-8
PROCEEDINGS PAPER
Investigation of Two-Equation Turbulence Models Applied to a Confined Axis-Symmetric Swirling Flow
Ulf Engdar,
Ulf Engdar
Lund Institute of Technology, Lund, Sweden
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Jens Klingmann
Jens Klingmann
Lund Institute of Technology, Lund, Sweden
Search for other works by this author on:
Ulf Engdar
Lund Institute of Technology, Lund, Sweden
Jens Klingmann
Lund Institute of Technology, Lund, Sweden
Paper No:
PVP2002-1590, pp. 199-206; 8 pages
Published Online:
August 14, 2008
Citation
Engdar, U, & Klingmann, J. "Investigation of Two-Equation Turbulence Models Applied to a Confined Axis-Symmetric Swirling Flow." Proceedings of the ASME 2002 Pressure Vessels and Piping Conference. Computational Technologies for Fluid/Thermal/Structural/Chemical Systems With Industrial Applications, Volume 2. Vancouver, BC, Canada. August 5–9, 2002. pp. 199-206. ASME. https://doi.org/10.1115/PVP2002-1590
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