Open Access4D spatiotemporal evolution of combustion intermediates in turbulent flames using burst-mode volumetric laser-induced fluorescence
Author(s) -
Benjamin R. Halls,
Naibo Jiang,
Terrence R. Meyer,
Sukesh Roy,
Mikhail N. Slipchenko,
James R. Gord
Publication year - 2017
Publication title -
optics letters/optics index
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.524
H-Index - 272
eISSN - 1071-2763
pISSN - 0146-9592
DOI - 10.1364/ol.42.002830
Subject(s) - optics , turbulence , combustion , fluorescence , materials science , laser induced fluorescence , laser , burst mode (computing) , mode (computer interface) , physics , chemistry , meteorology , electrical engineering , engineering , operating system , organic chemistry , computer science
High-speed (20 kHz rate), volumetric laser-induced-fluorescence imaging of combustion intermediates such as a formaldehyde (CH 2 O) and polycyclic aromatic hydrocarbon (PAH) species is demonstrated for tracking the four-dimensional (4D) evolution of turbulent flames. The third-harmonic, 355 nm output of a burst-mode Nd:YAG laser with a 130 mJ/pulse is expanded to 30 mm diameter for volume illumination of the base region of a methane-hydrogen jet diffusion flame. Eight simultaneous images from different viewing angles are used to collect the resulting fluorescence signal for reconstruction of 200 time-sequential three-dimensional volumes over 10 ms duration. The signal-to-noise ratio (SNR) of 300:1 is achieved after reconstruction with a temporal resolution of 100 ns and spatial resolution of 0.85-1.5 mm.