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Flame wrinkle destruction processes in harmonically forced, turbulent premixed flames

Published online by Cambridge University Press:  19 March 2013

Dong-Hyuk Shin and
Timothy Lieuwen
Dong-Hyuk Shin
Affiliation:
School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
Timothy Lieuwen*
Affiliation:
School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
*
†Email address for correspondence: tim.lieuwen@aerospace.gatech.edu
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Abstract

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This paper describes analyses of the nonlinear dynamics of harmonically forced, turbulent premixed flames. A key objective of this work is to analyse the ensemble-averaged dynamics of the flame front position, $\langle \xi \rangle $ , excited by harmonic forcing of amplitude $\varepsilon $ , in the presence of stochastic flow fluctuations of amplitude $\mu $ . Low-amplitude and/or near-field effects are quantified by a third-order perturbation analysis, while the more general case is analysed computationally by solving the three-dimensional level-set equation, extracting the instantaneous flame position, and ensemble averaging the results. We show that different mechanisms contribute to smoothing of flame wrinkles, manifested as progressive decay in the magnitude of $\langle \xi \rangle $ . Near the flame holder, random phase jitter, associated with stochastic velocity fluctuations tangential to the flame, is dominant. Farther downstream, propagation of the ensemble-averaged front normal to itself at the time-averaged turbulent burning velocity, $ \overline{{S}_{T, eff} } $ , leads to destruction of wrinkles, analogous to the laminar case, an effect that scales with $\mu $ . A second, new result is the demonstration that the ensemble-averaged turbulent burning velocity, ${S}_{T, eff} (s, t)$ , is modulated by the harmonic forcing, i.e. ${S}_{T, eff} (s, t)= \overline{{S}_{T, eff} (s)} + { S}_{T, eff}^{\prime } (s, t)$ , where ${ S}_{T, eff}^{\prime } $ has an inverse dependence upon the instantaneous, ensemble averaged-flame curvature, an effect that scales with $\varepsilon $ and $\mu $ . We show that this curvature dependence follows from basic application of Huygens propagation to flames with stochastic wrinkling superimposed upon base curvature. This effect also leads to smoothing of flame wrinkles and is analogous to stretch processes in positive-Markstein-length, laminar flames.

JFM classification

Reacting Flows: CombustionReacting Flows: Reacting FlowsReacting Flows: Turbulent reacting flows

Information

Type
Papers
Information
Journal of Fluid Mechanics , Volume 721 , 25 April 2013, pp. 484 - 513
Copyright
©2013 Cambridge University Press

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