Flow Turbulence Combust https://doi.org/10.1007/s10494-018-9936-0 Flame Induced Flow Features in the Presence of Darrieus-Landau Instability 1 1 Rachele Lamioni · Pasquale Eduardo Lapenna · 2 1 Guido Troiani · Francesco Creta Received: 5 February 2018 / Accepted: 17 May 2018 © Springer Science+Business Media B.V., part of Springer Nature 2018 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 intensi- ties, 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
"Flow, Turbulence and Combustion" – Springer Journals
Published: May 31, 2018
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