Burst-mode OH/CH2O planar laser-induced fluorescence imaging of the heat release zone in an unsteady flame

Retzer U, Pan R, Werblinski T, Huber F, Slipchenko MN, Meyer TR, Zigan L, Will S (2018)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2018

Journal

Optics Express Optical Society of America

Publisher: OSA - The Optical Society

Book Volume: 26

Pages Range: 18105-18114

Journal Issue: 14

DOI: 10.1364/OE.26.018105

Abstract

The paper presents simultaneous high-speed (7.5 kHz) planar laser-induced fluorescence (PLIF) of formaldehyde (CH2O) and the hydroxyl-radical (OH) for visualization of the flame structure and heat release zone in a non-premixed unsteady CH4/O-2/N-2 flame. For this purpose, a dye laser designed for high-speed operation is pumped by the secondharmonic 532 nm output of a Nd: YAG burst-mode laser to produce a tunable, 566 nm beam. After frequency doubling a high-energy kHz-rate narrowband pulse train of approximately 2.2 mJ/pulse at 283 nm is used for excitation of the OH radical. Simultaneously, CH2O is excited by the frequency-tripled output of the same Nd: YAG laser, providing a highfrequency pulse train over 10 ms in duration at high pulse energies (> 100 mJ/pulse). The excitation energies enable signal-to-noise ratios (SNRs) of similar to 10 and similar to 60 for CH2O and OH PLIF, respectively, using a single high-speed intensified CMOS camera equipped with an image doubler. This allows sufficient SNR for investigation of the temporal evolution of the primary heat release zone and the local flame structure at kHz rates from the spatial overlap of the OH-and CH2O-PLIF signals. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.

Authors with CRIS profile

Ulrich Retzer Lehrstuhl für Technische Thermodynamik Rongchao Pan Lehrstuhl für Technische Thermodynamik Thomas Werblinski Lehrstuhl für Technische Thermodynamik Franz Huber Lehrstuhl für Technische Thermodynamik Lars Zigan Lehrstuhl für Technische Thermodynamik Stefan Will Lehrstuhl für Technische Thermodynamik

Involved external institutions

Purdue-University US United States (USA) (US)

How to cite

APA:

Retzer, U., Pan, R., Werblinski, T., Huber, F., Slipchenko, M.N., Meyer, T.R.,... Will, S. (2018). Burst-mode OH/CH2O planar laser-induced fluorescence imaging of the heat release zone in an unsteady flame. Optics Express, 26(14), 18105-18114. https://dx.doi.org/10.1364/OE.26.018105

MLA:

Retzer, Ulrich, et al. "Burst-mode OH/CH2O planar laser-induced fluorescence imaging of the heat release zone in an unsteady flame." Optics Express 26.14 (2018): 18105-18114.

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