Experimental study of vorticity-strain interactions in turbulent premixed counterflow flames

Zhou, Bo; Frank, Jonathan H.

doi:10.1016/j.proci.2020.06.182

Experimental study of vorticity-strain interactions in turbulent premixed counterflow flames

Journal Article · Fri Sep 25 00:00:00 EDT 2020 · Proceedings of the Combustion Institute

DOI:https://doi.org/10.1016/j.proci.2020.06.182· OSTI ID:1760439

^[1]; Frank, Jonathan H. ^[2]

Sandia National Lab. (SNL-CA), Livermore, CA (United States); Southern University of Science and Technology, Shenzhen, Guangdong (China)
Sandia National Lab. (SNL-CA), Livermore, CA (United States)

Here, the effects of heat release on interactions between vorticity (ω) and strain rate (s) in turbulent premixed CH₄/O₂/N₂ counterflow flames are investigated using simultaneous OH laser-induced fluorescence (LIF) and tomographic particle image velocimetry (TPIV) measurements. A comparison between the flames and a corresponding turbulent non-reacting variable density N₂-vs-products counterflow reveals the impact of heat release on vorticity-strain rate alignment statistics. Vorticity and strain rate statistics in the flames and non-reacting flow are conditioned on distance from the local flame front and gas mixing layer interface (GMLI) contours, respectively. The magnitude, alignment, and spatial distribution of the vorticity and principal strain rates (s₁, s₂, s₃) are rather different when heat release is present. Density variations without heat release enhance the ω-s₂ alignment while significantly reducing the ω-s₃ alignment and modestly reducing the ω-s₁ alignment. In contrast, heat release at the flame front further reduces the ω-s₁ alignment but increases the ω-s₃ alignment and suppresses the preferential ω-s₂ alignment. Furthermore, increasing turbulence diminishes the effect of heat release on this preferential alignment. In regions with the largest vorticities, both the reacting and non-reacting counterflows show an increase in the probability of ω-s₂ alignment. All counterflow cases have a net positive vortex-stretching contribution to the enstrophy production with a peak production rate at the flame front or GMLI, but the peak values depend on the density variation, heat release, and turbulence level. Elucidation of the complex interplay between these factors contributes to the understanding of the dynamics of turbulence-flame interactions.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: 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:: 1760439

Alternate ID(s):: OSTI ID: 1777036

Report Number(s):: SAND--2020-14343J; 693144

Journal Information:: Proceedings of the Combustion Institute, Journal Name: Proceedings of the Combustion Institute Journal Issue: 2 Vol. 38; ISSN 1540-7489

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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High-repetition-rate OH-PLIF
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Experimental study of vorticity-strain interactions in turbulent premixed counterflow flames

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