High-speed volumetric imaging of formaldehyde in a lifted turbulent jet flame using an acousto-optic deflector

Li, Tao; Zhou, Bo; Frank, Jonathan H.; Dreizler, Andreas; Böhm, Benjamin

doi:10.1007/s00348-020-2915-y

Title: High-speed volumetric imaging of formaldehyde in a lifted turbulent jet flame using an acousto-optic deflector

Journal Article · Thu Apr 02 00:00:00 EDT 2020 · Experiments in Fluids

DOI:https://doi.org/10.1007/s00348-020-2915-y· OSTI ID:1770785

Li, Tao ^[1];

^[2]; Frank, Jonathan H. ^[3]; Dreizler, Andreas ^[1]; Böhm, Benjamin ^[1]

Technische Univ. Darmstadt (Germany)
Southern Univ. of Science and Technology, Shenzhen (China); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sandia National Lab. (SNL-CA), Livermore, CA (United States)

The development of high-speed volumetric laser-induced fluorescence measurements of formaldehyde (CH₂O-LIF) using a pulse-burst laser operated at a repetition rate of 100 kHz is presented here. A novel laser scanning system employing an acousto-optic deflector (AOD) enables quasi-4D CH₂O-LIF imaging at a scan frequency of 10 kHz. The diagnostic capability of time-resolved volumetric imaging is demonstrated in a partially premixed DME/air lifted turbulent jet flame near the flame base. Simultaneous imaging of laser beam profiles is performed to account for the laser pulse energy fluctuation and laser sheet inhomogeneity. With the accurate registration of laser sheet positions, the volumetric reconstruction of CH₂O-LIF signals is performed within a detection volume of 17.3 × 11.9 × 2.3 mm³ with an average out-of-plane spatial resolution of 250μm. A surface detection algorithm with adaptive thresholding is used to determine the global maximum intensity gradient by calculating gradient percentiles. The flame topology characteristics are investigated by evaluating the 3D curvatures of CH₂O surfaces. Curvatures calculated using 2D data systematically underestimate the full 3D curvature due to the lack of out-of-plane information. The inner surfaces near the turbulent fuel jet exhibit higher probabilities of large mean curvature than the outer surfaces. The saddle and cylindrical structures are dominant on both the inner and outer surfaces and the elliptic structures occur with lower probability. The results suggest that the damping of turbulent fluctuations by the temperature increase through the CH₂O region reduces the curvature, but the local structure topology remains self-similar.

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Research Organization:: Sandia National Lab. (SNL-CA), Livermore, CA (United States)

Sponsoring Organization:: German Research Foundation (DFG); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1770785

Report Number(s):: SAND-2021-2557J; 694487

Journal Information:: Experiments in Fluids, Vol. 61, Issue 4; ISSN 0723-4864

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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