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Application and assessment of background oriented Schlieren for laminar burning velocity measurements

Çakir, Bora Orçun LU orcid ; Sanned, David LU ; Prakash, Megha LU orcid ; Brackmann, Christian LU ; Richter, Mattias LU and Fureby, Christer LU (2024) In Experimental Thermal and Fluid Science 163.
Abstract
Schlieren imaging has been established as a reliable optical measurement technique for flame visualizations and retrieval of laminar burning velocity information. However, it is off limited capability and adaptability due to the optical configuration of a conventional Schlieren setup. In this regard, background oriented Schlieren (BOS) provides a unique opportunity to quantitatively characterize density varying flows by means of an inexpensive and uncomplicated setup. BOS is here demonstrated as an alternative approach for flame visualization in a Bunsen burner and to perform laminar burning velocity measurements of methane (CH4)/air mixtures. The results obtained with a variety of flame front reconstruction approaches are... (More)
Schlieren imaging has been established as a reliable optical measurement technique for flame visualizations and retrieval of laminar burning velocity information. However, it is off limited capability and adaptability due to the optical configuration of a conventional Schlieren setup. In this regard, background oriented Schlieren (BOS) provides a unique opportunity to quantitatively characterize density varying flows by means of an inexpensive and uncomplicated setup. BOS is here demonstrated as an alternative approach for flame visualization in a Bunsen burner and to perform laminar burning velocity measurements of methane (CH4)/air mixtures. The results obtained with a variety of flame front reconstruction approaches are compared with direct chemiluminescence imaging, 1D numerical simulations using the GRI3.0 combustion mechanism and experimental data from literature for which significant agreements are documented. The BOS technique extends the capabilities of Schlieren imaging and its ability to visualize flame structures of low luminescence, e.g. burning hydrogen or diluted mixtures under flameless conditions, makes it applicable for studies of combustion concepts aimed at reducing CO2
emissions.
(Less)
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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Förbränning, förbränningsdiagnostik
in
Experimental Thermal and Fluid Science
volume
163
article number
111357
pages
10 pages
publisher
Elsevier
external identifiers
  • scopus:85210616175
ISSN
0894-1777
DOI
10.1016/j.expthermflusci.2024.111357
language
English
LU publication?
yes
id
a18bd1dd-d76d-48fe-bb75-a5897db0780e
date added to LUP
2024-12-13 14:50:26
date last changed
2025-04-04 14:13:24
@article{a18bd1dd-d76d-48fe-bb75-a5897db0780e,
  abstract     = {{Schlieren imaging has been established as a reliable optical measurement technique for flame visualizations and retrieval of laminar burning velocity information. However, it is off limited capability and adaptability due to the optical configuration of a conventional Schlieren setup. In this regard, background oriented Schlieren (BOS) provides a unique opportunity to quantitatively characterize density varying flows by means of an inexpensive and uncomplicated setup. BOS is here demonstrated as an alternative approach for flame visualization in a Bunsen burner and to perform laminar burning velocity measurements of methane (CH<sub>4</sub>)/air mixtures. The results obtained with a variety of flame front reconstruction approaches are compared with direct chemiluminescence imaging, 1D numerical simulations using the GRI3.0 combustion mechanism and experimental data from literature for which significant agreements are documented. The BOS technique extends the capabilities of Schlieren imaging and its ability to visualize flame structures of low luminescence, e.g. burning hydrogen or diluted mixtures under flameless conditions, makes it applicable for studies of combustion concepts aimed at reducing CO<sub>2</sub><br/> emissions.<br/>}},
  author       = {{Çakir, Bora Orçun and Sanned, David and Prakash, Megha and Brackmann, Christian and Richter, Mattias and Fureby, Christer}},
  issn         = {{0894-1777}},
  keywords     = {{Förbränning; förbränningsdiagnostik}},
  language     = {{eng}},
  month        = {{11}},
  publisher    = {{Elsevier}},
  series       = {{Experimental Thermal and Fluid Science}},
  title        = {{Application and assessment of background oriented Schlieren for laminar burning velocity measurements}},
  url          = {{http://dx.doi.org/10.1016/j.expthermflusci.2024.111357}},
  doi          = {{10.1016/j.expthermflusci.2024.111357}},
  volume       = {{163}},
  year         = {{2024}},
}