Open AccessMegahertz-rate OH planar laser-induced fluorescence imaging in a rotating detonation combustor
Author(s) -
Paul S. Hsu,
Mikhail N. Slipchenko,
Naibo Jiang,
Christopher A. Fugger,
Austin M. Webb,
Venkat Athmanathan,
Terrence R. Meyer,
Sukesh Roy
Publication year - 2020
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.403199
Subject(s) - opos , optics , detonation , materials science , laser , planar laser induced fluorescence , schlieren imaging , optical parametric oscillator , dye laser , combustor , xenon , pulse (music) , ultraviolet , fluorescence , combustion , laser induced fluorescence , atomic physics , physics , chemistry , explosive material , schlieren , organic chemistry , detector
Megahertz-rate hydroxyl radical planar laser-induced fluorescence (OH-PLIF) was demonstrated in a hydrogen/air rotating detonation combustor for the first time, to the best of our knowledge. A custom injection-seeded optical parametric oscillator (OPO) pumped by the 355 nm output of a high-energy burst-mode laser produced narrowband pulses near 284 nm for OH excitation. The system generated sequences of more than 150 ultraviolet pulses with 400 µJ/pulse at 1 MHz and 150 µJ/pulse at 2 MHz. The order of magnitude improvement in the repetition rate over prior OH-PLIF measurements and in the number of pulses over previous megahertz burst-mode OPOs enables spatiotemporal analysis of complex detonation combustion dynamics.