Publication detail

Comparison of SAS Turbulence Model to the SST k-omega in Non-Premixed Combustion Simulation

VONDÁL, J. HÁJEK, J.

Original Title

Comparison of SAS Turbulence Model to the SST k-omega in Non-Premixed Combustion Simulation

English Title

Comparison of SAS Turbulence Model to the SST k-omega in Non-Premixed Combustion Simulation

Type

miscellaneous

Language

en

Original Abstract

Scale-Adaptive Simulation (SAS) enhances capabilities of Unsteady Reynolds-Averaged Navier-Stokes (URANS) to capture decay of large eddies in unsteady flows. SAS behaves like a LES in unsteady solutions with lower demand for local grid spacing. Its main effect is in restricting turbulent viscosity and consequently increasing velocity fluctuation. Such a effect is significant for predictions of chemical reactions and mixing when eddy dissipation model is incorporated. The reason is that this model is strongly bounded to the turbulence predictions. In the present paper the effect of SAS procedure is compared to the traditional SST k-omega turbulence model on the case of non-premixed swirling staged natural gas combustion in a confined environment of water cooled combustor. The aim is to provide accurate local wall heat flux predictions in industrial combustors at the end. The ability to predict local wall heat fluxes is highly relevant for engineering purposes as these fluxes are often the main results required by designers of fired heaters, boilers and combustion chambers.

English abstract

Scale-Adaptive Simulation (SAS) enhances capabilities of Unsteady Reynolds-Averaged Navier-Stokes (URANS) to capture decay of large eddies in unsteady flows. SAS behaves like a LES in unsteady solutions with lower demand for local grid spacing. Its main effect is in restricting turbulent viscosity and consequently increasing velocity fluctuation. Such a effect is significant for predictions of chemical reactions and mixing when eddy dissipation model is incorporated. The reason is that this model is strongly bounded to the turbulence predictions. In the present paper the effect of SAS procedure is compared to the traditional SST k-omega turbulence model on the case of non-premixed swirling staged natural gas combustion in a confined environment of water cooled combustor. The aim is to provide accurate local wall heat flux predictions in industrial combustors at the end. The ability to predict local wall heat fluxes is highly relevant for engineering purposes as these fluxes are often the main results required by designers of fired heaters, boilers and combustion chambers.

Keywords

CFD, Swirl flow, Combustion, Swirler, Turbulence Model

Released

01.09.2013

Location

Lyon, Francie

Pages from

1

Pages to

2

Pages count

2

URL

Documents

BibTex


@misc{BUT102098,
  author="Jiří {Vondál} and Jiří {Hájek}",
  title="Comparison of SAS Turbulence Model to the SST k-omega in Non-Premixed Combustion Simulation",
  annote="Scale-Adaptive Simulation (SAS) enhances capabilities of Unsteady Reynolds-Averaged Navier-Stokes (URANS) to capture decay of large eddies in unsteady flows. SAS behaves like a LES in unsteady solutions with lower demand for local grid spacing. Its main effect is in restricting turbulent viscosity and consequently increasing velocity fluctuation. Such a effect is significant for predictions of chemical reactions and mixing when eddy dissipation model is incorporated. The reason is that this model is strongly bounded to the turbulence predictions. In the present paper the effect of SAS procedure is compared to the traditional SST k-omega turbulence model on the case of non-premixed swirling staged natural gas combustion in a confined environment of water cooled combustor. The aim is to provide accurate local wall heat flux predictions in industrial combustors at the end. The ability to predict local wall heat fluxes is highly relevant for engineering purposes as these fluxes are often the main results required by designers of fired heaters, boilers and combustion chambers.",
  booktitle="Proceedings of 14th European Turbulence Conference",
  chapter="102098",
  howpublished="electronic, physical medium",
  year="2013",
  month="september",
  pages="1--2",
  type="miscellaneous"
}