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Investigation on bluff-body and swirl stabilized flames near lean blowoff with PIV/PLIF measurements and LES modelling

Guo, Shilong ; Wang, Jinhua ; Zhang, Weijie ; Lin, Bingxuan ; Wu, Yun ; Yu, Senbin LU ; Li, Guohua ; Hu, Zhiyun and Huang, Zuohua (2019) In Applied Thermal Engineering 160.
Abstract

Lean premixed combustion (LPC) is a promising technology for low-NOx emission, while it increases the risk of blowoff at the same time. Experiments and Large Eddy Simulations (LES) on swirl stratified lean-premixed CH4/air flames were performed to study the differences between the stable and near blowoff flame. The flow fields and instantaneous flame structures were measured by simultaneous Particle Image Velocimetry (PIV) and Planar Laser Induced Fluorescence (OH-PLIF). The Thickened Flame (TF) model coupled with a two-step reduced chemical mechanism was used in LES modelling. The non-dynamic formulation of sub-grid flame wrinkling model is performed well for stable condition while it cannot predict the near lean blowoff... (More)

Lean premixed combustion (LPC) is a promising technology for low-NOx emission, while it increases the risk of blowoff at the same time. Experiments and Large Eddy Simulations (LES) on swirl stratified lean-premixed CH4/air flames were performed to study the differences between the stable and near blowoff flame. The flow fields and instantaneous flame structures were measured by simultaneous Particle Image Velocimetry (PIV) and Planar Laser Induced Fluorescence (OH-PLIF). The Thickened Flame (TF) model coupled with a two-step reduced chemical mechanism was used in LES modelling. The non-dynamic formulation of sub-grid flame wrinkling model is performed well for stable condition while it cannot predict the near lean blowoff flame reasonable. Compared with the stable flame, several significant differences can be observed in the near lean blowoff flame. The height of high-temperature-zone is relatively low and the heat loss of flame attachment can be easily enhanced by the low temperature spot induced by flame-vortex interaction. The flame attachment is subject to higher excess strain rate and turbulence fluctuation. Meanwhile, a Processing Vortex Core (PVC) appears downstream of the centerline. It is concluded that lean blowoff is the result of interactions between the fuel/air mixture ignition, PVC instability and flame attachment lift-off.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Lean blowoff, LES, PIV/PLIF simultaneous measurement, Stratified swirl flame, TF model
in
Applied Thermal Engineering
volume
160
article number
114021
publisher
Elsevier
external identifiers
  • scopus:85068555153
ISSN
1359-4311
DOI
10.1016/j.applthermaleng.2019.114021
language
English
LU publication?
yes
id
e4ab957d-90e7-463d-9811-19b005ee37c2
date added to LUP
2019-07-16 10:32:24
date last changed
2022-04-26 03:05:01
@article{e4ab957d-90e7-463d-9811-19b005ee37c2,
  abstract     = {{<p>Lean premixed combustion (LPC) is a promising technology for low-NOx emission, while it increases the risk of blowoff at the same time. Experiments and Large Eddy Simulations (LES) on swirl stratified lean-premixed CH<sub>4</sub>/air flames were performed to study the differences between the stable and near blowoff flame. The flow fields and instantaneous flame structures were measured by simultaneous Particle Image Velocimetry (PIV) and Planar Laser Induced Fluorescence (OH-PLIF). The Thickened Flame (TF) model coupled with a two-step reduced chemical mechanism was used in LES modelling. The non-dynamic formulation of sub-grid flame wrinkling model is performed well for stable condition while it cannot predict the near lean blowoff flame reasonable. Compared with the stable flame, several significant differences can be observed in the near lean blowoff flame. The height of high-temperature-zone is relatively low and the heat loss of flame attachment can be easily enhanced by the low temperature spot induced by flame-vortex interaction. The flame attachment is subject to higher excess strain rate and turbulence fluctuation. Meanwhile, a Processing Vortex Core (PVC) appears downstream of the centerline. It is concluded that lean blowoff is the result of interactions between the fuel/air mixture ignition, PVC instability and flame attachment lift-off.</p>}},
  author       = {{Guo, Shilong and Wang, Jinhua and Zhang, Weijie and Lin, Bingxuan and Wu, Yun and Yu, Senbin and Li, Guohua and Hu, Zhiyun and Huang, Zuohua}},
  issn         = {{1359-4311}},
  keywords     = {{Lean blowoff; LES; PIV/PLIF simultaneous measurement; Stratified swirl flame; TF model}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Applied Thermal Engineering}},
  title        = {{Investigation on bluff-body and swirl stabilized flames near lean blowoff with PIV/PLIF measurements and LES modelling}},
  url          = {{http://dx.doi.org/10.1016/j.applthermaleng.2019.114021}},
  doi          = {{10.1016/j.applthermaleng.2019.114021}},
  volume       = {{160}},
  year         = {{2019}},
}