Abstract

We have employed, to the best of our knowledge, a novel excitation scheme to perform the first high-repetition-rate planar laser-induced fluorescence (PLIF) measurements of a CN radical in combustion. The third harmonic of a $\mathrm{Nd}\text{:}{\mathrm{YVO}}_4$ laser at 355 nm due to its relatively large linewidth overlaps with several R branch transitions in a CN ground electronic state. Therefore, the 355 nm beam was employed to directly excite the CN transitions with good efficiency. The CN measurements were performed in premixed ${\mathrm{CH}}_4-{\mathrm{N}}_2\mathrm{O}$ flames with varying equivalence ratios. A detailed characterization of the high-speed CN PLIF imaging system is presented via its ability to capture statistical and dynamical information in these premixed flames. Single-shot CN PLIF images obtained over a HMX pellet undergoing self-supported deflagration are presented as an example of the imaging system being applied towards characterizing the flame structure of energetic materials.

© 2018 Optical Society of America

20  kHz CH₂O and OH PLIF with stereo PIV

Stephen D. Hammack, Campbell D. Carter, Aaron W. Skiba, Christopher A. Fugger, Josef J. Felver, Joseph D. Miller, James R. Gord, and Tonghun Lee
Opt. Lett. 43(5) 1115-1118 (2018)

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

Ulrich Retzer, Rongchao Pan, Thomas Werblinski, Franz J. T. Huber, Mikhail N. Slipchenko, Terrence R. Meyer, Lars Zigan, and Stefan Will
Opt. Express 26(14) 18105-18114 (2018)

Continuous hydroxyl radical planar laser imaging at 50  kHz repetition rate

Stephen Hammack, Campbell Carter, Clemens Wuensche, and Tonghun Lee
Appl. Opt. 53(23) 5246-5251 (2014)

Hydroxyl radical planar laser-induced fluorescence imaging in flames using frequency-tripled femtosecond laser pulses

Ayush Jain, Pradeep Parajuli, Yejun Wang, and Waruna D. Kulatilaka
Opt. Lett. 45(17) 4690-4693 (2020)

10 kHz two-color OH PLIF thermometry using a single burst-mode OPO

Paul S. Hsu, Naibo Jiang, Josef J. Felver, Daniel K. Lauriola, Paul M. Danehy, and Sukesh Roy
Opt. Lett. 46(10) 2308-2311 (2021)