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Investigation of turbulent premixed methane/air and hydrogen-enriched methane/air flames in a laboratory-scale gas turbine model combustor

Liu, Xin LU ; Bertsch, Michael LU ; Subash, Arman Ahamed LU ; Yu, Senbin LU ; Szasz, Robert Zoltan LU ; Li, Zhongshan LU ; Petersson, Per LU ; Bai, Xue Song LU ; Aldén, Marcus LU and Lörstad, Daniel LU (2021) In International Journal of Hydrogen Energy 46(24). p.13377-13388
Abstract

Methane and hydrogen-enriched (25 vol% and 50 vol% H2-enriched CH4) methane/air premixed flames were investigated in a gas turbine model combustor under atmospheric conditions. The flame operability ranges were mapped at different Reynold numbers (Re), showing the dependence on Re and H2 concentrations. The effects of equivalence ratio (Φ), Re, and H2 enrichment on flame structure were examined employing OH-PLIF measurement. For CH4/air cases, the flame was stabilized with an M shape; while for H2-enriched cases, the flame transitions to a П shape above a specific Φ. This transition was observed to influence significantly the flashback limits. The flame shape transition... (More)

Methane and hydrogen-enriched (25 vol% and 50 vol% H2-enriched CH4) methane/air premixed flames were investigated in a gas turbine model combustor under atmospheric conditions. The flame operability ranges were mapped at different Reynold numbers (Re), showing the dependence on Re and H2 concentrations. The effects of equivalence ratio (Φ), Re, and H2 enrichment on flame structure were examined employing OH-PLIF measurement. For CH4/air cases, the flame was stabilized with an M shape; while for H2-enriched cases, the flame transitions to a П shape above a specific Φ. This transition was observed to influence significantly the flashback limits. The flame shape transition is most likely a result of H2 enrichment, occurring due to the increase in flame speed, higher resistance of the flame to the strain rate, and change in the inner recirculation zone. Flow fields of CH4/air flames were compared between low and high Re cases employing high-speed PIV. The flashback events, led by two mechanisms (combustion-induced vortex breakdown, CIVB, and boundary-layer flashback, BLF), were observed and recorded using high-speed OH chemiluminescence imaging. It was found that the CIVB flashback occurred only for CH4 flames with M shape, whereas the BLF occurs for all H2-enriched flames with П shape.

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author
; ; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Burner stabilization regime, Flame shape transition, Flashback mechanism, Hydrogen-enriched methane fuel, Swirl flames
in
International Journal of Hydrogen Energy
volume
46
issue
24
pages
13377 - 13388
publisher
Elsevier
external identifiers
  • scopus:85100656832
ISSN
0360-3199
DOI
10.1016/j.ijhydene.2021.01.087
language
English
LU publication?
yes
id
f93a0a21-21bc-4ff0-bfda-4885b7faad4a
date added to LUP
2021-02-25 08:42:33
date last changed
2022-04-27 00:22:22
@article{f93a0a21-21bc-4ff0-bfda-4885b7faad4a,
  abstract     = {{<p>Methane and hydrogen-enriched (25 vol% and 50 vol% H<sub>2</sub>-enriched CH<sub>4</sub>) methane/air premixed flames were investigated in a gas turbine model combustor under atmospheric conditions. The flame operability ranges were mapped at different Reynold numbers (Re), showing the dependence on Re and H<sub>2</sub> concentrations. The effects of equivalence ratio (Φ), Re, and H<sub>2</sub> enrichment on flame structure were examined employing OH-PLIF measurement. For CH<sub>4</sub>/air cases, the flame was stabilized with an M shape; while for H<sub>2</sub>-enriched cases, the flame transitions to a П shape above a specific Φ. This transition was observed to influence significantly the flashback limits. The flame shape transition is most likely a result of H<sub>2</sub> enrichment, occurring due to the increase in flame speed, higher resistance of the flame to the strain rate, and change in the inner recirculation zone. Flow fields of CH<sub>4</sub>/air flames were compared between low and high Re cases employing high-speed PIV. The flashback events, led by two mechanisms (combustion-induced vortex breakdown, CIVB, and boundary-layer flashback, BLF), were observed and recorded using high-speed OH chemiluminescence imaging. It was found that the CIVB flashback occurred only for CH<sub>4</sub> flames with M shape, whereas the BLF occurs for all H<sub>2</sub>-enriched flames with П shape.</p>}},
  author       = {{Liu, Xin and Bertsch, Michael and Subash, Arman Ahamed and Yu, Senbin and Szasz, Robert Zoltan and Li, Zhongshan and Petersson, Per and Bai, Xue Song and Aldén, Marcus and Lörstad, Daniel}},
  issn         = {{0360-3199}},
  keywords     = {{Burner stabilization regime; Flame shape transition; Flashback mechanism; Hydrogen-enriched methane fuel; Swirl flames}},
  language     = {{eng}},
  month        = {{02}},
  number       = {{24}},
  pages        = {{13377--13388}},
  publisher    = {{Elsevier}},
  series       = {{International Journal of Hydrogen Energy}},
  title        = {{Investigation of turbulent premixed methane/air and hydrogen-enriched methane/air flames in a laboratory-scale gas turbine model combustor}},
  url          = {{http://dx.doi.org/10.1016/j.ijhydene.2021.01.087}},
  doi          = {{10.1016/j.ijhydene.2021.01.087}},
  volume       = {{46}},
  year         = {{2021}},
}