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The Zimont TFC Model Applied to premixed Bluff Body Stabilized Combustion Using Four Different RANS Turbulence Models

Eriksson, Pontus LU (2007) ASME Turbo Expo 2007 In Proceedings of ASME GT2007 2. p.353-361
Abstract
The Volvo Aero Corp. (VAC) Triangular Bluff Body

Stabilized Combustion rig VR-1 has been extensively

researched both in terms of experiments and theoretical

treatment. Previous CFD work has concentrated on Reynolds

Averaged Navier-Stokes (RANS) models combined with the

Level Set Flamelet Library approach. Large Eddy Simulation

(LES) has also been applied to the case.

In this paper the Zimont Turbulent Flame Closure (TFC)

model has been investigated in conjunction with the k-ε, k-ω,

SST k-ω and RSM RANS model implementations in ANSYS

CFX 10.0.

It is shown that the various RANS models generate

significantly different results in terms... (More)
The Volvo Aero Corp. (VAC) Triangular Bluff Body

Stabilized Combustion rig VR-1 has been extensively

researched both in terms of experiments and theoretical

treatment. Previous CFD work has concentrated on Reynolds

Averaged Navier-Stokes (RANS) models combined with the

Level Set Flamelet Library approach. Large Eddy Simulation

(LES) has also been applied to the case.

In this paper the Zimont Turbulent Flame Closure (TFC)

model has been investigated in conjunction with the k-ε, k-ω,

SST k-ω and RSM RANS model implementations in ANSYS

CFX 10.0.

It is shown that the various RANS models generate

significantly different results in terms of turbulent velocity and

integral length scale fields. These parameters influence the

computed turbulent flame speed. The turbulent viscosity fields

also differ substantially between the various RANS models.

This will affect the computed degree of flame front diffusion.

For the investigated case; the TFC model combined with

the k-ω model fairly accurately captures the recirculation zone

length and overall turbulent flame speed. The measured case

however displays Kelvin-Helmholtz induced oscillations of the

shear layers behind the bluff body. This will combine with the

free-stream turbulence and turbulence generated along the

upstream surfaces of the bluff body to distort the flame sheets.

The two flame fronts will also be subjected to other (unquantified)

combustion related instabilities. The combined

effect is not captured well in steady state RANS. The analysis

is therefore seen to grossly under-predict flame front diffusion,

regardless of turbulence model. (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
Bluff Body, Kelvin-Helmholtz, Instability, RSM, SST, k-w, k-e, RANS, TFC, Afterburner, Zimont
in
Proceedings of ASME GT2007
volume
2
pages
8 pages
publisher
American Society Of Mechanical Engineers (ASME)
conference name
ASME Turbo Expo 2007
external identifiers
  • Scopus:34548733697
ISBN
0-7918-4791-8
DOI
10.1115/GT2007-27480
language
English
LU publication?
yes
id
261ed01a-f1ca-44aa-857b-0a3c01baa424 (old id 716098)
date added to LUP
2008-02-13 16:20:46
date last changed
2016-10-13 04:48:24
@misc{261ed01a-f1ca-44aa-857b-0a3c01baa424,
  abstract     = {The Volvo Aero Corp. (VAC) Triangular Bluff Body<br/><br>
Stabilized Combustion rig VR-1 has been extensively<br/><br>
researched both in terms of experiments and theoretical<br/><br>
treatment. Previous CFD work has concentrated on Reynolds<br/><br>
Averaged Navier-Stokes (RANS) models combined with the<br/><br>
Level Set Flamelet Library approach. Large Eddy Simulation<br/><br>
(LES) has also been applied to the case.<br/><br>
In this paper the Zimont Turbulent Flame Closure (TFC)<br/><br>
model has been investigated in conjunction with the k-ε, k-ω,<br/><br>
SST k-ω and RSM RANS model implementations in ANSYS<br/><br>
CFX 10.0.<br/><br>
It is shown that the various RANS models generate<br/><br>
significantly different results in terms of turbulent velocity and<br/><br>
integral length scale fields. These parameters influence the<br/><br>
computed turbulent flame speed. The turbulent viscosity fields<br/><br>
also differ substantially between the various RANS models.<br/><br>
This will affect the computed degree of flame front diffusion.<br/><br>
For the investigated case; the TFC model combined with<br/><br>
the k-ω model fairly accurately captures the recirculation zone<br/><br>
length and overall turbulent flame speed. The measured case<br/><br>
however displays Kelvin-Helmholtz induced oscillations of the<br/><br>
shear layers behind the bluff body. This will combine with the<br/><br>
free-stream turbulence and turbulence generated along the<br/><br>
upstream surfaces of the bluff body to distort the flame sheets.<br/><br>
The two flame fronts will also be subjected to other (unquantified)<br/><br>
combustion related instabilities. The combined<br/><br>
effect is not captured well in steady state RANS. The analysis<br/><br>
is therefore seen to grossly under-predict flame front diffusion,<br/><br>
regardless of turbulence model.},
  author       = {Eriksson, Pontus},
  isbn         = {0-7918-4791-8},
  keyword      = {Bluff Body,Kelvin-Helmholtz,Instability,RSM,SST,k-w,k-e,RANS,TFC,Afterburner,Zimont},
  language     = {eng},
  pages        = {353--361},
  publisher    = {ARRAY(0xa1b8f58)},
  series       = {Proceedings of ASME GT2007},
  title        = {The Zimont TFC Model Applied to premixed Bluff Body Stabilized Combustion Using Four Different RANS Turbulence Models},
  url          = {http://dx.doi.org/10.1115/GT2007-27480},
  volume       = {2},
  year         = {2007},
}