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Strategy for PLIF single-shot HCO imaging in turbulent methane/air flames

Zhou, Bo LU ; Kiefer, Johannes; Zetterberg, Johan LU ; Li, Zhongshan LU and Aldén, Marcus LU (2014) In Combustion and Flame 161(6). p.1566-1574
Abstract
Formyl (HCO) has since long been recognized as a common intermediate species and a potential local indicator of the major heat release in hydrocarbon combustion. Consequently, the detection of HCO is desirable especially in turbulent flames of practical relevance. However, due to the low concentration and low fluorescence quantum yield, single-shot based detection of HCO with planar laser-induced fluorescence (PLIF) has been a real challenge for experimentalists. In the present paper, a series of systematic investigations have been performed in order to develop a strategy for single-shot HCO PL1F detection in methane/air premixed flames. Potential spectral interference and applicable combustion conditions were analyzed in stable laminar... (More)
Formyl (HCO) has since long been recognized as a common intermediate species and a potential local indicator of the major heat release in hydrocarbon combustion. Consequently, the detection of HCO is desirable especially in turbulent flames of practical relevance. However, due to the low concentration and low fluorescence quantum yield, single-shot based detection of HCO with planar laser-induced fluorescence (PLIF) has been a real challenge for experimentalists. In the present paper, a series of systematic investigations have been performed in order to develop a strategy for single-shot HCO PL1F detection in methane/air premixed flames. Potential spectral interference and applicable combustion conditions were analyzed in stable laminar flames employing fluorescence detection with high spectral and spatial resolution for different laser wavelengths. The wavelength 259.004 nm was identified as optimum in giving the maximum signal and minimum spectral interference from other species (e.g., OH and hot O-2). Photolytically generated HCO from formaldehyde (CH2O) was also observed, which restricts the applicable laser fluence to below 2.5 J/cm(2) in order to diminish the influence of CH2O down to 5%. Besides, large hydrocarbon species generated in rich flames were found to contribute a considerable interference which can hardly be screened out. This limits the application of the HCO PLIF technique to lean premixed flames. Finally, by employing an optimized alexandrite laser system, single-shot HCO PLIF imaging in a turbulent methane/air flame is demonstrated, indicating the feasibility of further application of this technique to turbulent combustion systems. (C) 2013 The Combustion Institute. Published by Elsevier Inc. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Planar laser-induced fluorescence, Formyl radical, Heat release rate, Single-shot imaging, Turbulent flame, Spectral interference
in
Combustion and Flame
volume
161
issue
6
pages
1566 - 1574
publisher
Elsevier
external identifiers
  • wos:000335713900014
  • scopus:84899483552
ISSN
0010-2180
DOI
10.1016/j.combustflame.2013.11.019
language
English
LU publication?
yes
id
a282cabe-2f05-4399-ae81-87c97a2ead75 (old id 4469826)
date added to LUP
2014-06-19 09:16:56
date last changed
2017-11-19 03:42:11
@article{a282cabe-2f05-4399-ae81-87c97a2ead75,
  abstract     = {Formyl (HCO) has since long been recognized as a common intermediate species and a potential local indicator of the major heat release in hydrocarbon combustion. Consequently, the detection of HCO is desirable especially in turbulent flames of practical relevance. However, due to the low concentration and low fluorescence quantum yield, single-shot based detection of HCO with planar laser-induced fluorescence (PLIF) has been a real challenge for experimentalists. In the present paper, a series of systematic investigations have been performed in order to develop a strategy for single-shot HCO PL1F detection in methane/air premixed flames. Potential spectral interference and applicable combustion conditions were analyzed in stable laminar flames employing fluorescence detection with high spectral and spatial resolution for different laser wavelengths. The wavelength 259.004 nm was identified as optimum in giving the maximum signal and minimum spectral interference from other species (e.g., OH and hot O-2). Photolytically generated HCO from formaldehyde (CH2O) was also observed, which restricts the applicable laser fluence to below 2.5 J/cm(2) in order to diminish the influence of CH2O down to 5%. Besides, large hydrocarbon species generated in rich flames were found to contribute a considerable interference which can hardly be screened out. This limits the application of the HCO PLIF technique to lean premixed flames. Finally, by employing an optimized alexandrite laser system, single-shot HCO PLIF imaging in a turbulent methane/air flame is demonstrated, indicating the feasibility of further application of this technique to turbulent combustion systems. (C) 2013 The Combustion Institute. Published by Elsevier Inc. All rights reserved.},
  author       = {Zhou, Bo and Kiefer, Johannes and Zetterberg, Johan and Li, Zhongshan and Aldén, Marcus},
  issn         = {0010-2180},
  keyword      = {Planar laser-induced fluorescence,Formyl radical,Heat release rate,Single-shot imaging,Turbulent flame,Spectral interference},
  language     = {eng},
  number       = {6},
  pages        = {1566--1574},
  publisher    = {Elsevier},
  series       = {Combustion and Flame},
  title        = {Strategy for PLIF single-shot HCO imaging in turbulent methane/air flames},
  url          = {http://dx.doi.org/10.1016/j.combustflame.2013.11.019},
  volume       = {161},
  year         = {2014},
}