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Large Eddy Simulation of the Sensitivity of Vortex Breakdown and Flame Stabilisation to Axial Forcing

Iudiciani, Piero LU and Duwig, Christophe LU (2011) In Flow Turbulence and Combustion 86(3-4). p.639-666
Abstract
The effect of axial forcing on the flame/vortex breakdown interaction is studied, with particular focus on the Precessing Vortex Core (PVC). Large Eddy Simulation (LES), together with a filtered flamelet model describing the subgrid combustion, is performed to study a lean premixed flame undergoing mass flow fluctuations in a wide range of frequencies and amplitude. In average, forcing at frequencies lower than the PVC characteristic frequency moves the recirculation zone upstream the combustor in the premixing tube, while higher frequencies do not relevantly affect the flow/flame. With the help of Proper Orthogonal Decomposition (POD) a detailed analysis of the dynamics of the central recirculation zone (CRZ) is performed showing how the... (More)
The effect of axial forcing on the flame/vortex breakdown interaction is studied, with particular focus on the Precessing Vortex Core (PVC). Large Eddy Simulation (LES), together with a filtered flamelet model describing the subgrid combustion, is performed to study a lean premixed flame undergoing mass flow fluctuations in a wide range of frequencies and amplitude. In average, forcing at frequencies lower than the PVC characteristic frequency moves the recirculation zone upstream the combustor in the premixing tube, while higher frequencies do not relevantly affect the flow/flame. With the help of Proper Orthogonal Decomposition (POD) a detailed analysis of the dynamics of the central recirculation zone (CRZ) is performed showing how the excitation at lower frequencies weakens the PVC and allows the flame to propagate upstream. Extended POD is also applied to illustrate the flow/flame interactions during the excitation cycle. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Large Eddy Simulation, Premixed flame, Swirling flame dynamics, Axial, forcing, Proper Orthogonal Decomposition
in
Flow Turbulence and Combustion
volume
86
issue
3-4
pages
639 - 666
publisher
Springer
external identifiers
  • wos:000289210700016
  • scopus:79955916311
ISSN
1573-1987
DOI
10.1007/s10494-011-9327-2
language
English
LU publication?
yes
id
2b804a68-00e2-4fbe-8c3f-6834da7aad34 (old id 1965021)
date added to LUP
2011-05-23 12:15:55
date last changed
2017-01-15 03:02:34
@article{2b804a68-00e2-4fbe-8c3f-6834da7aad34,
  abstract     = {The effect of axial forcing on the flame/vortex breakdown interaction is studied, with particular focus on the Precessing Vortex Core (PVC). Large Eddy Simulation (LES), together with a filtered flamelet model describing the subgrid combustion, is performed to study a lean premixed flame undergoing mass flow fluctuations in a wide range of frequencies and amplitude. In average, forcing at frequencies lower than the PVC characteristic frequency moves the recirculation zone upstream the combustor in the premixing tube, while higher frequencies do not relevantly affect the flow/flame. With the help of Proper Orthogonal Decomposition (POD) a detailed analysis of the dynamics of the central recirculation zone (CRZ) is performed showing how the excitation at lower frequencies weakens the PVC and allows the flame to propagate upstream. Extended POD is also applied to illustrate the flow/flame interactions during the excitation cycle.},
  author       = {Iudiciani, Piero and Duwig, Christophe},
  issn         = {1573-1987},
  keyword      = {Large Eddy Simulation,Premixed flame,Swirling flame dynamics,Axial,forcing,Proper Orthogonal Decomposition},
  language     = {eng},
  number       = {3-4},
  pages        = {639--666},
  publisher    = {Springer},
  series       = {Flow Turbulence and Combustion},
  title        = {Large Eddy Simulation of the Sensitivity of Vortex Breakdown and Flame Stabilisation to Axial Forcing},
  url          = {http://dx.doi.org/10.1007/s10494-011-9327-2},
  volume       = {86},
  year         = {2011},
}