Linear Response of Laminar Premixed Flames to Flow Oscillations: Unsteady Stretch Effects

�c and � � s ,forcurvatureand hydrodynamic strain, respectively. Unsteady curvature effects on the flame surface area become significant when j� � c jSt 2 2 � O� 1� and are responsible for the experimentally observed reduction in the flame front wrinkle size in the flow direction [referred to as “filtering” by Bourehla and Baillot (Bourehla, A., and Baillot, F., “Appearance and Stability of a Laminar Conical Premixed Flame Subjected to an...