Advanced

Development of improved PLIF CH detection using an Alexandrite laser for single-shot investigation of turbulent and lean flames

Li, Zhongshan LU ; Kiefer, J.; Zetterberg, Johan LU ; Linvin, Martin LU ; Leipertz, A.; Bai, Xue-Song LU and Aldén, Marcus LU (2007) 31st International Symposium on Combustion In Proceedings of the Combustion Institute 31 I. p.727-735
Abstract
We report on the development of planar laser-induced fluorescence (PLIF) for CH imaging with improved detection sensitivity for single-shot investigations of turbulent, lean, premixed flames. A ringcavity, pulsed Alexandrite laser was frequency-doubled to excite the lines in the R-branch band-head of the B-X (0,0) band and broadband fluorescence from the B-X (0,1), A-X (1,1) and (0,0) bands, overlapping in the spectral range around 431 nm, was collected. The employed Alexandrite laser, which is characterized by its long pulse duration (150 ns), gives a tunable laser beam around 775 nm with a pulse energy for the second harmonic at the CH absorption wavelength of about 70 mJ. Moreover, the laser has the possibility to be operated in narrow... (More)
We report on the development of planar laser-induced fluorescence (PLIF) for CH imaging with improved detection sensitivity for single-shot investigations of turbulent, lean, premixed flames. A ringcavity, pulsed Alexandrite laser was frequency-doubled to excite the lines in the R-branch band-head of the B-X (0,0) band and broadband fluorescence from the B-X (0,1), A-X (1,1) and (0,0) bands, overlapping in the spectral range around 431 nm, was collected. The employed Alexandrite laser, which is characterized by its long pulse duration (150 ns), gives a tunable laser beam around 775 nm with a pulse energy for the second harmonic at the CH absorption wavelength of about 70 mJ. Moreover, the laser has the possibility to be operated in narrow bandwidth (100 MHz) or broad bandwidth (8 cm<sup>-1</sup>). An introductory high resolution excitation scan over the R-branch band-head was performed and, in addition, saturated excitation with the broadband option of the laser was investigated. By simultaneous excitation of several rotational transitions and to bring these transitions close to saturation, high signal-to-noise ratios were reached over a wide range of equivalence ratios. A sharp and thin CH layer was observed in single-shot PLIF images from laminar premixed methane/air flames from Φ = 0.6 to Φ = 1.5. Finally, the impact of the developed CH PLIF technique is demonstrated in a highly turbulent, lean, partially premixed methane/air flame established on a co-axial jet flame burner. © 2006 The Combustion Institute. Published by Elsevier Inc. All rights reserved. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Lean premixed methane/air flame, Planar laser-induced fluorescence, CH radical, Laser combustion diagnostics, Turbulent combustion
in
Proceedings of the Combustion Institute
volume
31 I
pages
727 - 735
publisher
Elsevier
conference name
31st International Symposium on Combustion
external identifiers
  • wos:000252858000072
  • other:CODEN: SYMCAQ
  • scopus:34548810425
ISSN
1540-7489
1873-2704
DOI
10.1016/j.proci.2006.08.015
language
English
LU publication?
yes
id
beae6119-b6f4-4706-8a4f-37e9f27a3d97 (old id 643395)
date added to LUP
2007-12-04 15:49:29
date last changed
2017-11-19 03:34:30
@inproceedings{beae6119-b6f4-4706-8a4f-37e9f27a3d97,
  abstract     = {We report on the development of planar laser-induced fluorescence (PLIF) for CH imaging with improved detection sensitivity for single-shot investigations of turbulent, lean, premixed flames. A ringcavity, pulsed Alexandrite laser was frequency-doubled to excite the lines in the R-branch band-head of the B-X (0,0) band and broadband fluorescence from the B-X (0,1), A-X (1,1) and (0,0) bands, overlapping in the spectral range around 431 nm, was collected. The employed Alexandrite laser, which is characterized by its long pulse duration (150 ns), gives a tunable laser beam around 775 nm with a pulse energy for the second harmonic at the CH absorption wavelength of about 70 mJ. Moreover, the laser has the possibility to be operated in narrow bandwidth (100 MHz) or broad bandwidth (8 cm&lt;sup&gt;-1&lt;/sup&gt;). An introductory high resolution excitation scan over the R-branch band-head was performed and, in addition, saturated excitation with the broadband option of the laser was investigated. By simultaneous excitation of several rotational transitions and to bring these transitions close to saturation, high signal-to-noise ratios were reached over a wide range of equivalence ratios. A sharp and thin CH layer was observed in single-shot PLIF images from laminar premixed methane/air flames from Φ = 0.6 to Φ = 1.5. Finally, the impact of the developed CH PLIF technique is demonstrated in a highly turbulent, lean, partially premixed methane/air flame established on a co-axial jet flame burner. © 2006 The Combustion Institute. Published by Elsevier Inc. All rights reserved.},
  author       = {Li, Zhongshan and Kiefer, J. and Zetterberg, Johan and Linvin, Martin and Leipertz, A. and Bai, Xue-Song and Aldén, Marcus},
  booktitle    = {Proceedings of the Combustion Institute},
  issn         = {1540-7489},
  keyword      = {Lean premixed methane/air flame,Planar laser-induced fluorescence,CH radical,Laser combustion diagnostics,Turbulent combustion},
  language     = {eng},
  pages        = {727--735},
  publisher    = {Elsevier},
  title        = {Development of improved PLIF CH detection using an Alexandrite laser for single-shot investigation of turbulent and lean flames},
  url          = {http://dx.doi.org/10.1016/j.proci.2006.08.015},
  volume       = {31 I},
  year         = {2007},
}