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
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:
https://lup.lub.lu.se/record/643395
- author
- Li, Zhongshan
LU
; Kiefer, J.
; Zetterberg, Johan
LU
; Linvin, Martin
LU
; Leipertz, A.
; Bai, Xue-Song
LU
and Aldén, Marcus
LU
- organization
- publishing date
- 2007
- 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
- host publication
- Proceedings of the Combustion Institute
- volume
- 31 I
- pages
- 727 - 735
- publisher
- Elsevier
- conference name
- 31st International Symposium on Combustion
- conference location
- Heidelberg, Germany
- conference dates
- 2006-08-05 - 2006-08-11
- 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
- 2016-04-01 12:13:09
- date last changed
- 2024-07-03 16:40:30
@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<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.}},
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}},
keywords = {{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}},
doi = {{10.1016/j.proci.2006.08.015}},
volume = {{31 I}},
year = {{2007}},
}