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Experimental study of hydrogen addition effects on a swirl-stabilized methane-air flame

Li, Mao LU ; Tong, Yiheng LU ; Klingmann, Jens LU and Thern, Marcus LU (2017) In Energies 10(11).
Abstract

The effects of H2 addition on a premixed methane-air flame was studied experimentally with a swirl-stabilized gas turbine model combustor. Experiments with 0%, 25%, and 50% H2 molar fraction in the fuel mixture were conducted under atmospheric pressure. The primary objectives are to study the impacts of H2 addition on flame lean blowout (LBO) limits, flame shapes and anchored locations, flow field characteristics, precessing vortex core (PVC) instability, as well as the CO emission performance. The flame LBO limits were identified by gradually reducing the equivalence ratio until the condition where the flame physically disappeared. The time-averaged CH chemiluminescence was used to reveal the... (More)

The effects of H2 addition on a premixed methane-air flame was studied experimentally with a swirl-stabilized gas turbine model combustor. Experiments with 0%, 25%, and 50% H2 molar fraction in the fuel mixture were conducted under atmospheric pressure. The primary objectives are to study the impacts of H2 addition on flame lean blowout (LBO) limits, flame shapes and anchored locations, flow field characteristics, precessing vortex core (PVC) instability, as well as the CO emission performance. The flame LBO limits were identified by gradually reducing the equivalence ratio until the condition where the flame physically disappeared. The time-averaged CH chemiluminescence was used to reveal the characteristics of flame stabilization, e.g., flame structure and stabilized locations. In addition, the inverse Abel transform was applied to the time-averaged CH results so that the distribution of CH signal on the symmetric plane of the flame was obtained. The particle image velocimetry (PIV) was used to detect the characteristics of the flow field with a frequency of 2 kHz. The snapshot method of POD (proper orthogonal decomposition) and fast Fourier transform (FFT) were adopted to capture the most prominent coherent structures in the turbulent flow field. CO emission was monitored with an exhaust probe that was installed close to the combustor exit. The experimental results indicated that the H2 addition extended the flame LBO limits and the operation range of low CO emission. The influence of H2 addition on the flame shape, location, and flow field was observed. With the assistance of POD and FFT, the combustion suppression impacts on PVC was found.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
CO emission, Lean blowout (LBO), Particle image velocimetry (PIV), Precessing vortex core (PVC), Proper orthogonal decomposition (POD), Swirl-stabilized flame
in
Energies
volume
10
issue
11
publisher
MDPI AG
external identifiers
  • scopus:85033230649
  • wos:000417046500088
ISSN
1996-1073
DOI
10.3390/en10111769
language
English
LU publication?
yes
id
5e3af934-fb33-424f-83c7-b132ccf09a59
date added to LUP
2017-11-16 09:36:41
date last changed
2018-01-16 13:25:44
@article{5e3af934-fb33-424f-83c7-b132ccf09a59,
  abstract     = {<p>The effects of H<sub>2</sub> addition on a premixed methane-air flame was studied experimentally with a swirl-stabilized gas turbine model combustor. Experiments with 0%, 25%, and 50% H<sub>2</sub> molar fraction in the fuel mixture were conducted under atmospheric pressure. The primary objectives are to study the impacts of H<sub>2</sub> addition on flame lean blowout (LBO) limits, flame shapes and anchored locations, flow field characteristics, precessing vortex core (PVC) instability, as well as the CO emission performance. The flame LBO limits were identified by gradually reducing the equivalence ratio until the condition where the flame physically disappeared. The time-averaged CH chemiluminescence was used to reveal the characteristics of flame stabilization, e.g., flame structure and stabilized locations. In addition, the inverse Abel transform was applied to the time-averaged CH results so that the distribution of CH signal on the symmetric plane of the flame was obtained. The particle image velocimetry (PIV) was used to detect the characteristics of the flow field with a frequency of 2 kHz. The snapshot method of POD (proper orthogonal decomposition) and fast Fourier transform (FFT) were adopted to capture the most prominent coherent structures in the turbulent flow field. CO emission was monitored with an exhaust probe that was installed close to the combustor exit. The experimental results indicated that the H<sub>2</sub> addition extended the flame LBO limits and the operation range of low CO emission. The influence of H<sub>2</sub> addition on the flame shape, location, and flow field was observed. With the assistance of POD and FFT, the combustion suppression impacts on PVC was found.</p>},
  articleno    = {1769},
  author       = {Li, Mao and Tong, Yiheng and Klingmann, Jens and Thern, Marcus},
  issn         = {1996-1073},
  keyword      = {CO emission,Lean blowout (LBO),Particle image velocimetry (PIV),Precessing vortex core (PVC),Proper orthogonal decomposition (POD),Swirl-stabilized flame},
  language     = {eng},
  number       = {11},
  publisher    = {MDPI AG},
  series       = {Energies},
  title        = {Experimental study of hydrogen addition effects on a swirl-stabilized methane-air flame},
  url          = {http://dx.doi.org/10.3390/en10111769},
  volume       = {10},
  year         = {2017},
}