Abstract
High-speed (20kHz rate), volumetric laser-induced-fluorescence imaging of combustion intermediates such as a formaldehyde (CH2O) and polycyclic aromatic hydrocarbon (PAH) species is demonstrated for tracking the four-dimensional (4D) evolution of turbulent flames. The third-harmonic, 355nm output of a burst-mode Nd:YAG laser with a 130mJ/pulse is expanded to 30mm 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 10ms duration. The signal-to-noise ratio (SNR) of 300:1 is achieved after reconstruction with a temporal resolution of 100ns and spatial resolution of 0.85-1.5mm.
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