Abstract
The onset of hydrodynamic or Darrieus-Landau (DL) instability can largely impact on premixed flame morphology, turbulent flame speed and induced flow field. In this work, we focus on the latter induced flow by means of two dimensional direct numerical simulations (DNS) of slot burner flames performed in a parametric fashion. Results from linear stability analysis are used to select the adequate parameter range to be investigated. The presence of DL instability is initially assessed using a recently proposed statistical marker related to flame morphology. The differences between stable and unstable flames are then statistically investigated, utilizing a single, laminar, DL-induced corrugation as a reference state. Such DL-induced effects are investigated at various turbulence intensities, in terms of local propagation, induced strain rate patterns and flow field as well as vorticity production and transformation. Using displacement speed as a measure of local propagation, no noticeable statistical difference is observed between stable and unstable flames while strain rate and vorticity patterns are shown to be largely influenced by the DL induced morphology. From the modeling point view, an enhancement of counter gradient type transport for turbulent scalar fluxes is observed for hydrodynamically unstable flames.
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The authors acknowledge the Italian Super-Computing Interuniversity Consortium CINECA for support and high-performance computing resources under Grant No.DL-3D-SC/ HP10C4YS8W.
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Lamioni, R., Lapenna, P.E., Troiani, G. et al. Flame Induced Flow Features in the Presence of Darrieus-Landau Instability. Flow Turbulence Combust 101, 1137–1155 (2018). https://doi.org/10.1007/s10494-018-9936-0
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DOI: https://doi.org/10.1007/s10494-018-9936-0