Effect of pre-strain and excess length on unsteady fluid–structure interactions of membrane airfoils |
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Authors: | P Rojratsirikul Z Wang I Gursul |
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Institution: | 1. Imperial College London, London, UK;2. University of Southampton, Southampton, UK;1. College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, PR China;2. School of Aerospace, Transport and Manufacturing, Cranfield University, Cranfield, UK;3. School of Control Science and Eng, Shandong University, Jinan, PR China |
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Abstract: | Aerodynamic characteristics of two-dimensional membrane airfoils were experimentally investigated in a wind tunnel. The effects of the membrane pre-strain and excess length on the unsteady aspects of the fluid–structure interaction were studied. The deformation of the membrane as a function of angle of attack and free-stream velocity was measured using a high-speed camera. These measurements were complemented by the measurements of unsteady velocity field with a high frame-rate Particle Image Velocimetry (PIV) system as well as smoke visualization. Membrane airfoils with excess length exhibit higher vibration modes, earlier roll-up of vortices, and smaller separated flow regions, whereas the membranes with pre-strain generally behave more similarly to a rigid airfoil. Measured frequencies of the membrane vibrations suggest a possible coupling with the wake instabilities at high incidences for all airfoils. |
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