Investigation on bluff-body and swirl stabilized flames near lean blowoff with PIV/PLIF measurements and LES modelling
(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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- author
- Guo, Shilong ; Wang, Jinhua ; Zhang, Weijie ; Lin, Bingxuan ; Wu, Yun ; Yu, Senbin LU ; Li, Guohua ; Hu, Zhiyun and Huang, Zuohua
- organization
- publishing date
- 2019-09
- 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}}, }