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- W2118367026 abstract "Steady-flow assumption provides a convenient criterion for flow separation linking the pressure gradient to the local characteristics of the boundary layer. However the boundary layer on the verge of separation is seldom (if at all) steady, it contains large eddies that are generated by instabilities. It was recently shown [1-3] that periodic addition of momentum may prevent separation with the same degree of control authority that is achieved by steady blowing, with one important difference: the momentum input required may be orders of magnitude smaller. This is particularly true when the input perturbations are amplified due to the instability of the mean flow [4]. It was also observed that the instability of a shear layer governs the minimum input required for a separated flow to reattach back to the surface. This determines the optimum frequency and amplitude of the harmonic perturbation necessary to force reattachment [4]. However the reattached flow encloses a bubble that may easily burst when the pressure gradient is further increased. An increase in the excitation frequency reduces the size of the bubble even though the amplitude of the excitation remains unchanged. This is so because the initial rate of amplification of the perturbations is higher and it increases the entraining capacity of the shear layer bounding the bubble. These concepts rely on the large span-wise coherence (i.e. the two-dimensionality) of the dominant turbulent structures that are triggered and enhanced by the periodic excitation. A separated mixing layer or one that bounds a bubble are not likely to be dominated by stream-wise vortices, however a boundary layer on a concave surface (such that exists on most of Liebeck’s airfoils [5]) or a wall jet on a convex surface may indeed be. Two cases are discussed in the paper, one that contains large streamwise vortices and one that does not." @default.
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- W2118367026 date "1999-01-01" @default.
- W2118367026 modified "2023-09-27" @default.
- W2118367026 title "The Effects of Flow Instabilities on the Active Control of Separation" @default.
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- W2118367026 doi "https://doi.org/10.1007/978-94-011-4199-4_54" @default.
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