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- W2313302257 abstract "Reported herein is an investigation of the influence of the structural flexibility of sinusoidally pitching airfoils on the pattern of vorticity shed into the wake. For rigid airfoils, it is well known that, depending on the frequency of oscillation, this pattern takes the form of the classical or reverse von Karman vortex street. The latter may be characterized by the vortex circulation () and vortex-to-vortex streamwise and cross-stream spacing (a and b respectively). In the present work, these three parameters are obtained from particle image velocimetry measurements in the wake of airfoils consisting of a rigid ‘head’ and flexible ‘tail’, fabricated using 3D printing methods. Data are obtained at chord Reynolds number Rec = 1950 for different tail flexibilities (obtained by varying the thickness of the tail) as well as for a fully rigid airfoil. The results show that using the Strouhal number based on the actual trailing edge oscillation amplitude yields a common description of the dependence of a and b on the motion parameters for all airfoils. These results are complemented with analyses using a vortex array model to clarify the relationship between variation in the three wake-vortex pattern parameters and the net mean thrust acting on the airfoil." @default.
- W2313302257 created "2016-06-24" @default.
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- W2313302257 date "2013-01-05" @default.
- W2313302257 modified "2023-09-26" @default.
- W2313302257 title "Investigation of the Wake Vortex Pattern of Rigid and Flexible Airfoils Undergoing Harmonic Pitch Oscillation" @default.
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- W2313302257 doi "https://doi.org/10.2514/6.2013-841" @default.
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